AV Guru

Is a Microphone Preamp Necessary?

November 7, 2017 by AV Guru

Microphone preamps are used to amplify low level, unstable signals to a usable, steadier line level signal. A microphone preamp can be either a preamplifier circuit in a device, or a dedicated external device containing a circuit. This article will focus on external microphone preamps, their benefits, and what to look for when purchasing one.

For those wondering if they need an external microphone preamp, the answer is usually, yes. They are considered essential for creating better quality audio and can benefit any microphone being used, especially condenser microphones. Audio signals coming from microphones are weak, and preamps help to translate it into a stronger signal for recording.

Almost any sound source needs a preamp to amplify those low-level signals, and most audio interfaces have one built-in for this purpose. However, that built-in preamp might not be creating the best audio possible, making the addition of an external preamp necessary in some cases.

External microphone preamps bring these five benefits to an audio system that built-in preamps can’t:

Lower Noise

When using low output microphones, an external preamp can make an improvement on the noise coming from the microphone.

More Gain

Most built-in preamps offer 60dB gain or less, which is a mismatch for low output microphones that require more gain. An external preamp can increase the gain, creating a better sound.

Special Sound Character

For clean and transparent sound, a built-in preamp will work just fine. However, if a special sound characteristic such as an older pre-hi-tech sound is wanted, an external preamp can make that happen. Different types of preamps can also bring different sound styles.

Better Sound Quality

High quality external preamps keep the sound clear as the gain settings are increased.

More Features

Sometimes additional features are needed or wanted for better control over the audio and external preamps can provide these. They often have additional features not found on built-in preamps such as phase reverse, low cut, and pad switches.

After deciding an external microphone preamp is necessary, it’s time to find the right one. To do this, users must look at a variety of factors, like:

Inputs and Outputs

Every microphone preamp will have at least one microphone input and one line-level output. This works for basic recording purposes, but for those that want more functionality, they will need more inputs and outputs. A hi-Z Direct Input will be needed to record electric instruments directly and multiple outputs allow for connectivity options.

Tubes vs. Solid State

Tube and solid-state preamps create different sounds. The desired type of sound will determine which is needed. Having both gives the studio a variety of options.

Channels

There are single-channel, dual-channel, and multi-channel preamps available. Single- and dual-channel preamps generally cost less, but leave little room for expansion. Even those not currently using two or more microphones simultaneously could benefit from a multi-channel preamp later.

Taking these factors into consideration along with talking to an audio expert will help determine the right type of microphone preamp needed for recording purposes.

Investing in a high-quality microphone preamp will make every type of microphone sound better. Talk to AV Superstore about improving audio in the studio with a microphone preamp or visit the AVSuperstore to learn more about the products available.

Creating Flexibility in the Conference Room

October 19, 2017 by AV Guru

When it comes to deciding on audiovisual equipment to put in a conference room, there are a lot of options available. There are three basic pieces of technology every conference room should consider installing. These are:

Projector – Most presentations need a projector. It’s the perfect vehicle for delivering a slideshow, sharing a video, or magnifying statistics for the whole group to see. In addition to, or instead of standard projection screens with video projectors, conference rooms may also use large flat panel displays for presentations and conferencing. Also, large flat panels can also be used for interactive sharing of content and ideas. Products such as the Infocus Mondopads would fit into this category. With such a large variety of projectors available, everyone can find the perfect fit for their conference room.
Video Abilities – Having the ability for video conference calls is important in today’s business world. It allows for worldwide collaboration without flying halfway around the world. Have a video camera available for occasions when these conference calls are necessary.
Audio – Presentations and video conference calls will only be successful if there’s audio. To hear presentations and those speaking over video, speakers need to be installed throughout the room. They can be mounted from the ceiling, walls, or set up on stands. Whichever gives the best audio range for the room.

On the flip side, microphones are also needed to produce the audio. For presentations, consider clip-on lavalier mics for mobility. They are user friendly and are barely noticeable during the presentation. For video conferencing, there are quite a few choices. A single microphone that extends down from the ceiling can catch the audio of everyone around a small table. Or, go with a shotgun microphone that can sit on the table facing one speaker to eliminate room noise.

Those are just three of the basics. There are many more audiovisual solutions available to further the functionality of the conference room like 4k televisions and interactive whiteboards. The more technology available, the more flexible the conference room and now more than ever flexibility is important in the workplace. Meetings can be formal or informal, require a projector or whiteboard, be attended by a small team or the entire office. Most workplaces don’t have multiple conference rooms to accommodate all of these “what ifs” so it’s important to make the existing space as efficient as possible.

Consider options for being able to adjust the layout of the room, moveable screens, and wireless connectivity for a streamlined process. To make the room work for various types of meetings, it should be designed with these tips in mind:

Open Space – A large, open room will provide the space needed to reconfigure the room. This allows for breakout groups during brainstorming sessions, moveable walls to be added when needed, and multiple types of furniture to be present.
Room Colors – Instead of using darker paint colors or dark wood paneling to decorate the room, choose light colors. This creates a lighter environment, making it easier for others to see what is happening over video conference calls.
Eliminate Natural Light – Natural lighting can be detrimental to presentations depending on the projector set-up and camera visibility. Instead of relying on natural light, install uniform lighting throughout the room. If natural light is wanted during meetings that don’t require a projector, install light-blocking window treatments.
Casual Atmosphere – Even formal meetings don’t need a stuffy, boardroom feeling anymore. A table and chairs might still be necessary, but also give furniture options like lounge style seating for informal meetings. It brings a comfortable feeling that can increase creativity.
Multiple Connections – Have tabletop boxes for phone or tablet charging and sharing. Bring Your Own Device (BYOD) is becoming increasingly common in conference rooms, huddle spaces, and even classrooms. There needs to be enough connections to support this for all kinds of gadgets or wireless connectivity.

AV Superstore can provide the latest in audiovisual equipment needed for productivity and flexibility in conference rooms and other settings. Contact us today to learn more about the variety of equipment available to create the best conference room possible.

AV Equipment Mounts

October 19, 2017 by AV Guru

When it comes to installing audiovisual equipment, where and how it gets mounted is an important aspect. The wrong installment can be detrimental to its intended application, but there’s a mount for every need. Here’s a rundown on types of mounts for audiovisual equipment.

TV Mounts

Mounting the television to the wall or ceiling frees up more space in smaller rooms. Not all mounts are the same, however. Some wall mounts have more mobility, which can be beneficial when viewers change locations in the room.

Low Profile Mounts

The low-profile wall mount sits close to the wall, and is the easiest to install. However, after the television is mounted, it cannot be adjusted without re-hanging the mount. This can be an issue if the viewing angle needs to change or the room is rearranged.

Tilting Mounts

A tilting wall mount gives users the option to tilt it vertically, but not horizontally. This allows the television to be installed higher on the wall if necessary, while still providing optimal viewing by adusting the tilted of the screen.

Full-Motion Mounts

In large rooms where the viewing angle needs to be changed, a full-motion wall mount is the best choice. These have an arm that allows the user to adjust the horizontal viewing angle by moving it away from the wall. It is the most expensive and difficult set up of the wall mounts, but the viewing flexibility makes it worth it.

Ceiling Mounts

Sometimes the wall or it’s material is not capable of supporting a wall mount, such as a brick wall. A ceiling mount is the solution in this case. Ceiling mounts can also rotate and tilt in all directions for the perfect viewing angle.

Projector Mounts

Mounting a projector can be a tricky task when dealing with screen sizes and throwing ratios. Thankfully, there are a lot of options when it comes to projector mounts.

Ceiling Mounts

When considering ceiling mounts, users must decide if they want a dedicated or universal style of mount. Dedicated mounts have a specific pattern of screw holes that align with the array of screw holes on a specific projector make. Universal mounts have moveable screw holes to accommodate many different projectors of varying sizes, which can be beneficial in the long run.

Short Throw Mounts

Short throw projectors need a specific type of mount due to their throw ratio. They need to be installed inches from the screen. Most of these are wall mounts that have a telescoping arm to accommodate the distance requirements. There are also some ceiling mounts available when a wall mount won’t work.

Stacking Mounts

In many applications, stacking projectors is necessary to increase lumens in certain lighting. To accommodate this, there are stackable mounts allowing for one projector to sit atop another. These are generally mounted from the ceiling, but can also sit atop a table.

Projector Lifts

While also installed on the ceiling, these mounts hide the projector when it isn’t in use. They are motorized and can be raised and lowered with the push of a button.

Speaker Mounts

If speakers are not in the correct position, the audio could be distorted. Finding the right spot for speakers can be challenging, but finding the mount to make it possible is not. Here are some speaker mount options:

Tilt and Swivel Mounts

Used to secure speakers to the wall or ceiling, these have arms that can be swiveled. This allows for adjustment of the audio if necessary. Tilt and swivel mounts are often used in surround sound applications.

Fixed Wall and Ceiling Mounts

To keep speakers in one set position, fixed wall and ceiling mounts are available. Many houses of worship or auditoriums have fixed ceiling and wall speakers to keep audio going in a set direction or pattern.

TV Speaker Mounts

If the speakers need to accompany a television or interactive screen, they can be center channel mounted or side mounted. Both of these styles attach to the mount behind the screen and can move with the television to point at the viewer.

Speaker Stands

In areas where excess floor space is available, speaker stands are an option. They are generally made of poles with a flat base. Easy adjustability for position and height make them popular.

Camera Mounts

Cameras are used in all kinds of commercial applications from recording or live streaming lectures and speeches to video conferencing for collaboration efforts.

Ceiling Mounts

Many spaces use ceiling mounts for their video needs. Ceiling mounts can be mounted directly on the surface of the ceiling and remain completely visible. This is called a surface mount. A flush mount is when the camera is mounted inside the ceiling with only a portion of the camera and housing visible. A pendant mount hangs down from the ceiling like a pendant, which can be beneficial in situations where the camera needs to sit more at eye level like video conferencing or when more viewing angles are necessary.

Wall Mounts

With some wall mounts, the camera’s housing is connected to an arm so it sits out from the wall a few inches. Some of these mounts have an inside cable gland to protect the cable. For video conferencing needs, look at low-profile wall mounts. They are ideal for mounting the camera above a monitor that is also on a low-profile mount. Many are universal and work with all kinds of cameras, large or small.

AV Superstore has all kinds of mounts for your audiovisual equipment. Talk with our AV specialists to find out which one is right for your application.

Short Throw and Long Throw Projectors

October 13, 2017 by AV Guru

One of the factors buyers must consider when choosing a new projector is the throw capabilities. This refers to the distance between the projector and the screen needed to get the right size image. A simple equation to find this is screen width x throw ratio = throw distance.

Here’s an example: If the projector screen is 10 feet wide and the throw ratio of the projector is 1.8:1, then the projector needs to be placed 18 feet away. 10 x 1.8 = 18. However, when deciding on a throw ratio for the projector, buyers must look at the screen size and how far away the projector is likely to be placed. In this instance they would take the throw distance and divide by the screen size to determine the throw ratio needed in a projector.

Room sizes vary considerably, and not every projector can be placed 18 feet away from the screen. This is why there are short throw and long throw projectors. The primary difference between these projectors is the type of lens included. Short throw projectors generally have a non-zoom, curved lens, while most long throw projectors have standard zoom lenses.

Short Throw Projectors

A projector with a ratio less than 1:1 is considered short throw. There are also ultra-short throw projectors which have a throw ratio of less than 0.4. Ultra-short throw projectors have a mirror that the image is projected onto first before it is reflected onto the screen.

Short throw projectors need to be placed less than three feet from the screen. Their ideal distance is 18 in.-2 ft. Ultra-short throw projectors can be placed just 15 inches away from the screen to get a 100 inch image. However, if they are placed back too far, the image will become distorted.

It is recommended to use short throw and ultra-short throw projectors with interactive whiteboards or fixed-frame screens. The shorter throw technologies can amplify any imperfections and waviness of a surface that isn’t completely flat, such as a motorized or pull-down screen.

For the best results short throw projectors should be mounted on a wall. This short distance prevents shadows and keeps the projector light from shining in the presenter’s face while they speak. Short throw projectors allow for presentations and multimedia sharing in classrooms or conference rooms with limited space.

Both short throw and ultra-short throw projectors are more expensive and are used mostly in commercial applications because of their cost.

Long Throw Projectors

Long throw projectors can require six or more feet of distance from the screen to project a 100 inch image. If this type of projector is installed closer than that to the screen, the image will shrink and not reach the edges of the screen.

In larger lecture halls, auditoriums, or conference centers, long distance projectors can project onto a large screen for maximum visibility for everyone in the room. They can also be used with all types of projector screens without amplifying screen ripples.

The main advantage of long throw projectors is that they are more cost-effective than short throw alternatives, but they do have some disadvantages as well. It is easy for the presenter to walk in front of the projected image, disrupting the audience’s view. They’re also subject to a glare on the screen.

AV Superstore has both short throw and long throw projectors available to customers. Visit our website to learn more and chat with the online support for assistance in finding the perfect projector for any size space.

The Quick Guide to Microphones and Applications

October 10, 2017 by AV Guru

Microphones are used for a variety of applications in many different types of venues. Finding the right one can be a chore with so many options and factors to consider. AV Superstore has put together a quick guide to help customers learn about their options.

Types of Microphones

Condenser

This type of microphone has a capacitor capsule inside of it. The capacitor has a solid back plate and a diaphragm made of a thin, flexible material. This diaphragm vibrates when hit with sound waves, changing the distance between it and the solid back plate, which changes the capacitance. These microphones need a voltage to operate, which can be supplied by phantom power or a battery inside of the mic.

Condenser microphones have a greater frequency response and transient response, but are very sensitive to loud sounds. However, they are the microphone of choice for recording vocals in a quiet environment.

Dynamic

These microphones work by electromagnetic induction. There is a diaphragm with an induction coil attached on the inside of the mic. The coil is positioned within the magnetic field of a permanent magnet. When sound waves enter the mic, they make the diaphragm vibrate, which in turn causes the coil within the magnetic field to vibrate. This creates a varying current and turns the sound into electrical energy. The electrical signal created can then be amplified with a microphone pre-amp or mixing desk.

Dynamic microphones are more rugged in style than condenser microphones allowing them to be resistant to moisture and other accidents. This style of microphone also has less sensitivity to distant sounds and minimizes feedback, making them an excellent choice for use in live environments.

Wired vs. Wireless

Microphones can be wireless, or be powered through a cable (wired). Each has its own advantages and disadvantages, but the choice ultimately comes down to the application. Before deciding between the two, ask these questions:

Is the performer/speaker going to be stationary or moving about?

If whoever is speaking will be stationary, a wired microphone with a stand will work just fine. However, many people like to move about while speaking, or must for their presentation. The cables of a wired microphone can make that difficult or hazardous. For more mobile speakers, a wireless microphone makes more sense.

Is syncing the receiver and transmitter going to be difficult for wireless options?

While a sound engineer isn’t needed to use a wireless microphone, not everyone is adept at using them. They require a little more knowledge and set-up than their wired counterparts. If learning and remembering how to sync the transmitter and receiver will be an issue, a wired microphone might be a better fit.

What type of microphone is needed?

Handheld microphones can be either wired or wireless. Other styles of microphones, such as lavalier and headset, are only wireless. So, the type of microphone needed can make the wired or wireless decision easy.

Styles of Microphones

Handheld

Able to be both wired or wireless, handheld microphones are used in a variety of applications. Presenters and lecturers can use them if they don’t mind having only one hand free. If they need both hands, they can set the microphone in a stand, but this limits their mobility.

Applications: Handheld microphones are great for seminars, lectures, and meetings.

Shotgun

Shotgun microphones need to be pointed directly at the speaker to adequately pick up the sound. They are generally set on the table in a fixed position facing whoever is speaking. Shotgun mics can also be used as a boom for broadcast and media productions.

Applications: Shotgun microphones are used most often in meetings and conferences or for broadcast.

Gooseneck

Gooseneck microphones are flexible, which allow the user to adjust it for the best audio possible. They are attached to a podium, installed in a table, or plugged into a microphone base.

Applications: Many meetings and conferences use this style of microphone.

Boundary Microphones

This style of microphone is positioned near or flush with a boundary or surface. It can be used to record whole room sound while barely being noticed.

Applications: This can be used for meetings or classrooms where an unobtrusive microphone is needed.

Lavalier

This wireless microphone has a transmitter in a body pack that can be clipped onto a belt or pocket of the speaker. The mic itself clips onto clothing, such as a collar. Lavalier mics give the speaker ultimate mobility during a presentation.

Applications: Broadcast, presentations, houses of worship, and teachers will reap the benefits of these mics.

Headset

Headset microphones clip behind the user’s ear and position the microphone close to their mouth. The transmitter is part of the ear clip.

Applications: These are ideal for workout instructors, theater actors, and anyone else who needs freedom to move.

AV Superstore has a large variety of wired and wireless microphones available. Talk with their audio experts for help finding the perfect microphone for any event or venue.

Assistive Listening Technologies and Applications

October 4, 2017 by AV Guru

Assistive listening systems can be described as amplifiers that bring sound directly to the ear. They work by separating the sounds that a person wants to hear from background noise that may be happening around them.

These systems are used to help overcome common listening challenges by minimizing background noise, overriding poor acoustics of a room, and reducing the effect of distance between the sound source and the person listening. These situations occur more often than most people realize and can include houses of worship, convention centers, theaters, auditoriums and other large venues. Visitors can quickly become frustrated with their experience at the venue if they are unable to accurately hear the information being presented.

Today 17% of adults in America report some degree of hearing loss due to congenital loss, aging, injury, prolonged exposure to loud noise, etc. Because of this, many venues incorporate an assistive listening system not only to improve the visitor experience but to comply with the Americans with Disabilities Act. Some of the newer requirements of the ADA for assistive listening systems include:

An assistive listening system needs to be provided in assembly areas where audible communication is integral to the use of the space.
Assistive listening is required to be provided where there is amplified sound, such as a microphone or speakers.
A percentage of receivers are required to be hearing-aid compatible and interface with telecoils in hearing aids.

There are additional ADA requirements and exemptions so it is important to review the full ADA requirements for your specific application before purchasing a system. In addition, there are some tax credits and tax deductions available in certain situations which may help cover the cost of the new system.

Available Technologies

Assistive listening systems utilize RF (radio), IR (infrared), or inductive loop technologies to bring audio to the listener. While they each take a different approach, all three technologies transmit the audio source wirelessly to a personal receiver or directly to a compatible hearing aid.

Radio Technology

This system delivers audio to the listener with broadcast technology along with an RF receiver and earphones. There is usually a small transmitter with an antenna that is worn by the recipient, offering them mobility and flexibility. The RF system is ideal for guiding group tours and offers great wireless coverage for large areas such as convention centers and large auditoriums.

Infrared Technology

Using infrared light, the audio is transmitted with a modulator, emitter, IR receiver and earphones. The audio signal is conveyed onto a sub-carrier in the modulator, which in turn is converted into infrared light by the emitter. This system only works in line-of-sight environments and does not go through solid surfaces. This can be beneficial in venues that require privacy, such as a courtroom. This system requires all listeners, regardless of whether or not they have hearing limitations, to wear the IR receiver.

Inductive Loop Technology

In this system, a magnetic field is used to wirelessly transmit audio to the listener. It has a wire, or flat copper tape loop installed usually on the floor of the venue. Anyone with a compatible hearing aid (one that includes a T-coil) will automatically receive the assisted listening signal when they enter the range of the coverage. Listeners without the T-coil equipped hearing device can use a receiver unit to benefit from the assistive listening system.

Regardless of the type of system selected, be sure to post visible signage at the venue and in event advertising to make people aware that the facility is equipped with a hearing assistance system.

Find a wide selection of assistive listening systems at the AV Superstore and be sure to contact our audiovisual experts with any questions regarding choosing the best assistive listening system for your venue.

Devices for Altering Audiovisual Signals

October 4, 2017 by AV Guru

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With so many diverse electronics to connect to one another for audiovisual applications, sometimes supporting devices are needed to make the connection easier and of a stronger quality. Audiovisual switchers, extenders, converters, and distribution amplifiers are some of the devices used in these situations. Read on to find out what each of these does, and when or where it should be used:

Switcher

A switcher offers a central hub for the connection of many audiovisual components, helping to consolidate multiple inputs into a single output or display. The device will switch between inputs by automatically detecting a signal from a connected device, or it can be changed manually. A basic switcher might require all connected devices to support the same signal. However, more modern switchers can support multiple signal formats as well.

Use a switcher when there are multiple sources that need to be displayed through a single output. Classrooms often use multiple devices to display information with a projector. If the projector doesn’t have enough inputs to accommodate all the devices, a switcher would be the perfect solution.

Extender

In many applications, audio and video are required to travel a long distance before being displayed. Signals running through cables or connections can only go so far before quality becomes compromised. In these cases, an extender (also known as a repeater) can help the signal reach the display without compromising on quality.

Extension devices can be passive or active. Passive extenders use transformers, and active extenders use powered amplifiers and active devices. Choosing between the two depends on the length of the extension, type of signal, and video quality expectation.

Look at the distance requirements for the audiovisual signal being used, as each is different. If the cable travel length to the display surpasses the suggested length limitation, use an extender to maintain or improve the signal quality. This can be especially helpful in large venues such as auditoriums where equipment is often located at opposite ends of the venue.

Converter

A converter alters a video signal so that the output is different from the input signal. This is necessary when an older device that uses analog signals is being used with a modern display that uses digital signals. Analog signals are fundamentally different than digital signals, requiring an active signal conversion rather than a passive one.

In any situation where an analog source is being used with a digital display, a converter will be necessary. With analog outputs on the decline due to the fast-changing nature of audiovisual technology, there are many situations where this can occur.

Distribution Amplifier

Distribution amplifiers accept a single input and provide the same signal to multiple isolated outputs. This allows a signal to be distributed to multiple destinations without ground loops or signal degradation. An example for usage of a distribution amplifier would be having a DVD player that needs to connect to two separate displays. The DVD player is connected to the distribution amplifier, which in turn sends the signal to two or more displays.

HDMI Audio Extractor

For those who want to send the source from a device, such as a Blu-ray player, to a sound bar for better audio instead of relying on the television speakers, an HDMI audio extractor will do the trick. It takes the audio from the HDMI source, duplicates it, and then sends it out to the sound bar. The video on the television won’t be disrupted during this process.

Find these audiovisual devices and more at the AV Superstore. We also have audiovisual experts available to help determine the best solution for your audiovisual needs.

Presentation Technology for Education and Business Applications

September 28, 2017 by AV Guru

During presentations, whether in an education or business setting, speakers use audiovisual equipment and technology to make an impact and hold the audience’s attention. These different pieces of equipment work together to create an informational and entertaining presentation.

Projectors

Projectors are commonly used in educational and business settings to display information, data, and multimedia during a presentation. They use three different types of technology, which are: LCD, DLP 1 and 3 chip and Laser. Each type has its own advantages and can be chosen based on preference.

Other than their technology, projectors can differ from one another in these ways as well:

Brightness

Brightness is measured in lumens. The higher the lumens, the brighter the projector will be. Be sure to look at both the white brightness and color brightness. In an educational or business setting, it should have a higher lumen rating on both because it will likely need to compete with other light sources in the room.

Contrast Ratio

Contrast is the amount of difference between the darkest and brightest areas of a picture. The contrast ratio is very important and a higher contrast ratio will make the colors look better.

Resolution

This is the total number of pixels the projector can display. The more pixels that fit in the display, the more detailed the image will be. In educational and business applications, formats like SVGA 800×600 pixels and XGA 1026×768 pixels 4:3 are great for PowerPoint presentations while higher resolutions like WXGA 1280 x 800 16:10 (720P), 1620 x 1200 WUXGA 16:10 are better for photography and data graphics.

Throw Ratio

The throw ratio describes how wide the image will be when the projector is a certain distance away from the screen. This aspect is important to look at when installing a permanent projector in a room. In smaller classrooms or conference rooms, a short throw projector will be the best fit.

Lens Zoom

Lens zoom is important for portable projectors. When traveling for presentations, there won’t always be control over the screen size or placement of the projector. To fix this, adjust the image size with the lens zoom. The greater the zoom ratio, the larger the image can be made.

Keystone Correction/Lens Shift

Again, for portability, look at the keystone correction and lens shift. When unable to place the projector perpendicular to the screen, the keystone correction allows the user to correct distortion so it is perfectly straight. Lens shift also corrects distortion, however it is corrected manually instead of digitally.

Portability

When presenting in an educational or business setting, traveling to venues is required. In this situation, a portable projector can make setting up for the presentation in a different environment easier. Portable projectors are lightweight and compact.

Connections

Projectors built for educational and business applications generally have VGA and USB inputs. Some have DVI or HDMI as well. For the sake of convenience and ease, however, find a projector with wireless capabilities. This allows the user to send the presentation or visual aid to the projector via laptop, smartphone, or tablet.

Projector Screens

There are four types of projector screens available to pair with the projector. They are:

Motorized

These screens can be raised or lowered with a control. They can be ceiling or wall-mounted for maximum retractability. This is the best type of screen in situations where it would be difficult to pull down the screen manually.

Fixed

Fixed projector screens are wall-mounted and do not raise or lower. This type of screen is best used in a room dedicated only to presentations that require the projector.

Manual

This projector screen raises and lowers by hand, allowing the space to be used for other purposes.

Portable

For traveling presentations, a portable screen is a must. It can be packed away and carried around easily since it is compact. For support, it has either tripod legs or a built-in stand.

After choosing which style of projector screen will work best for your situation, the next step is comparing screen surfaces. There are many to choose from such as gray, white, high contrast, glass bead, etc. While each has its own advantages, matte white is the most versatile and will work for any educational or business presentation.

The size of the screen depends on a few factors related to the venue it will be used in and the projector itself.

Throw Ratio

Knowing the throw ratio of the projector will allow the user to choose the best size screen to complement it. If the screen is chosen before the projector, choose a larger one than is thought necessary. It is better to have extra room than to have the image spilling off the sides.

Screen Placement

The screen should be elevated at least four feet from the floor so everyone in the room can see it easily. The height should be about 1/5 the distance of the farthest viewer. Make sure it has favorable viewing angles for everyone.

Microphones

In a larger venue, like a lecture hall, it can be challenging to hear the presentation without amplified sound. A complete commercial sound system might not be necessary, but a microphone is generally required. Mobility is the largest factor when choosing a microphone for presentation purposes.

Handheld

While it produces high quality audio, this style of microphone leaves the presenter with only one hand. For those who don’t need to make gestures or don’t mind holding it, a handheld microphone is prefect.

Hands free

For a hands free presentation, there are many clip on wireless microphone systems. They connect via a body pack transmitter, allowing the speaker to move about the venue freely. However, these can have feedback issues when used improperly. Frequently they are clipped in the middle of the user’s chest and are not positioned close enough to the speaker’s mouth. A solution to this issue is to use a wireless headset microphone or ear set mic. These options keep the microphone positioned within inches of the mouth. Even when the presenter turns their head to the side, the headset or ear set stays in a consistent proximity to the mouth.

Podium Microphone

In many educational or business settings, the presenter is standing behind a podium of some sort. A gooseneck microphone allows for handsfree speaking, while standing in one spot. It can be bent and angled for different speakers as well.

These three pieces of AV equipment provide speakers the necessary technology for any presentation in an educational or business setting. Let AV Superstore help find the perfect equipment for any presentation need.

Wireless Microphone Systems

September 20, 2017 by AV Guru

Wireless microphones project a speaker’s voice while allowing them to move freely about the room during a presentation. There are a variety of wireless microphone systems and components on the market, but every system consists of these three parts:

Microphone

There are three common types of wireless microphones, each with a specific purpose.

Handheld

While this is the simplest wireless microphone, it also produces the highest quality of audio of all the options. This is due to the size of the diaphragm that it has. It is easily passed around for question and answer settings or interviewing.

Lavalier

For speakers who need both hands free during a presentation, the lavalier microphone is their best option. It can be attached in many ways, reducing its visibility. The mobility and use of both hands makes up for the slight reduction in sound quality. This type of microphone connects to the transmitter via a thin cable.

Headset

For those who need complete freedom for movement, such as performers and fitness instructors, headset microphones are a common choice. The microphone is positioned close to the mouth and away from clothing so it doesn’t pick up any movement sounds. The transmitter for this microphone is in the ear clip, which is connected to the microphone by a thin, pliable wire.

Transmitter

The transmitter sends the sound from the microphone to the wireless receiver at the mixing console. There are two types: handheld and bodypack. Handheld microphones have the transmitter built in to the microphone itself.

Receiver

The receiver processes the signals that the transmitter sends, converting them into an electrical signal, which produces the live audio the audience hears. Receivers are available in single or multi-channel options, depending on the number of wireless microphones being used.

In addition to how hands-free the speaker needs to be, there are many technical factors that can have an impact on which type of wireless microphone is best.

Transmission

Wireless microphones systems can have analog or digital transmitters. Choosing which type of transmitter relies heavily on how many wireless microphones will be used simultaneously. If one or two microphones are being used, a digital transmitter will work. If there’s multiple microphones being used, analog is a better fit. These transmitters have a range of frequencies, allowing multiple speakers to perform without interfering with one another.

Another transmission factor to consider is if it broadcasts in UHF or VHF. Very high frequency (VHF) is a range of radio frequencies between 49 and 216MHz. This is separated into low band (49108MHz) and high band (169-216MHz). The low band shares frequencies with telephones, television channels, and more. It is not a good range for interference-free wireless microphone usage. High band is used in professional applications throughout the United States. There are two specific bands that are approved for wireless microphone users.

Ultra high frequency (UHF) also has several bands approved for use with wireless microphone systems. UHF radio waves are much shorter in wavelength, which translates into reduced efficiency of transmission through the air, walls, and people. This results in a shorter range for the wireless microphone system. However, with their greater bandwidth, UHF signals have greater audio dynamic range.

Travel Capabilities

For traveling speakers, their gear needs to be able to travel with them safely and be set up easily. They should consider rack mounts to reduce set-up time. The connections stay in place while moving and the rack mounts protect the gear from potential damage. The receiver traveling speakers use should have a removable antenna to prevent the antenna from accidentally being snapped off.

Signal Distance

Speakers who move around during a speech need to consider the transmission range of the system. If they walk too far away from the receiver, or something obstructs the path, the signal reception and sound quality can be compromised. Look at a system that has a longer transmission range to prevent this problem.

When shopping for a wireless microphone system be sure to check out AV Superstore’s selection of wireless microphone systems and accessories. Talk to our audio experts to find the right system for a speech, presentation, or performance.

Audio & Video for Houses of Worship

September 20, 2017 by AV Guru

Communicating with congregations through audiovisual technology is becoming increasingly popular in houses of worship. This can include a mix of speakers, video projection and display, lighting, broadcasting equipment, and more. No matter the size of the congregation, a house of worship’s audio visual equipment has become an important technical component of their services.

Here’s a look at the technology needed in a house of worship:

Audio

Much of a house of worship’s service revolves around listening, which is why the audio system should be of primary concern. Here are the necessary components of a quality sound system:

Microphones

Many different microphones will be needed for the various aspects of the service. The person leading the service will need a headset or lapel microphone for maximum movement. There should also be a pulpit microphone for others to use during readings. Lastly, microphones for the music, both the instruments and the choir. In a smaller setting, the instruments might not need individual microphones.

Soundboard

The soundboard connects all audio sources to the amplifier and speakers. A separate channel is needed for each source, so you’ll want to take that into consideration when selecting the right soundboard. Also look at the number of tone controls, auxiliary, and effects being sent on each channel.

Equalizer

Used to tailor the sound system to the room acoustics, the equalizer can reduce the feedback that occurs when increasing the volume. Generally, once this is set, it can be left alone as long as no major changes are made to the system or room acoustics.

Amplifier

While the amplifier determines the overall power of the system, it needs to match the speakers’ power rating to prevent issues with the system. In this capacity, there is generally not a lot of power needed. For speeches, only about 10-20 watts will be used and for live music, there’s a possibility for that need to increase to 50-100 watts.

Speakers

The number and type of speakers used in a house of worship depends on the size of the room, the quality needed, what audio will be used, and aesthetics. Choosing between powered and passive speakers can eliminate a separate amplifier from the system because powered speakers already have one built in. The speakers can be placed on the floor, wall mounted, or ceiling mounted for concealment purposes.

Video

More and more frequently houses of worship are recording or live streaming their services to reach a broader audience. Here are the components of a video system for a house of worship:

Cameras

The size of the venue will determine whether a single camera system or a multiple camera system will be needed. Multiple cameras are often needed for larger houses of worship in order to capture various angles of the service. Depending on the quality requirements, a choice will need to be made between standard definition and high definition cameras. This depends mostly on the budget.

PTZ controller

If pan-tilt-zoom cameras are being used, a PTZ controller is needed. One person can operate multiple cameras using one joystick-style controller, which is often more reliable than the IR remote that comes with the camera. This also allows for the cameras to be mounted out of the view of the congregation.

Mixer

The inputs and outputs of a mixer are the most important consideration. Review what type and number of inputs the mixer has, the type and number of outputs, and if audio will need to be mixed with the video. The second consideration needs to be the possibility for expansion. The mixer should be able to handle more cameras than the venue is currently using so there’s room to grow the system later.

Video Capture Device

Whether recording or streaming, a video capture device is required to capture video from the cameras to the computer. USB video capture devices work best in situations where a laptop is being used, and video is only being captured from one camera. If the computer is not a laptop, it will have a PCIe slot, which is beneficial when using a multi-channel PCIe capture card with multiple cameras.

AV Superstore can assist in designing the perfect audiovisual setup for a house of worship of any size. Visit our website or give us a call at 866-866-6767 to learn more about the systems available.