Choosing the Best Mixer/Amplifier

such as speaker placement, boundary loading (are speakers placed close to a wall or in a corner?), size of the room, coupling of multiple speakers/subwoofers, reverberance of the room, the type of music, the type of activity and the expectations of the listeners all come into play.

Positioning Subwoofer Components

Hanging a subwoofer in the middle of a room results in the lowest possible output from the subwoofer. Placing a subwoofer at the ceiling, wall or floor increases its output. Placing it within a few feet of a 2-boundary junction (like a ceiling/wall junction or a wall/wall junction) increases its output further. Placement within 3 feet of a corner increases its output still more. In these cases, there is both an increase in sensitivity (output per watt of input) and in maximum total SPL capability. This can help in getting as much sound as possible from a few subwoofers. However, there is a potential pitfall in placing a subwoofer in a corner: You can wind up with uneven bass coverage in the room.

Because there are often so few subwoofers, you can have a problem getting even coverage of the space. People sitting or standing very close to the subwoofer are going to hear excessive lows while people who are father away might not be getting enough.

To resolve this problem keep in mind that as you move farther from the sub, the volume drops off, typically at 6 dB per doubling of distance. Then, when you reach a certain distance, the subwoofer level stops dropping off at such a high rate. This is called the critical distance, which is where the reverberant field within the room equals the direct sound from the subwoofer. The critical distance depends on how reverberant the room is. As you get farther past critical distance, even though the level of the subwoofer doesn't drop off nearly as quickly, the quality of the subwoofer sound might not be as good. But even though this may happen, it's sometimes acceptable for subwoofers in business music applications.

One way to make the subwoofer coverage as even as possible is to use more than one. In many places, it's a good idea to add a second subwoofer, or more. Even if you don't need additional subwoofers for volume reasons, you might want to consider them just for evenness of subwoofer coverage. Generally, if you have to use just one subwoofer, it is best to sacrifice the sensitivity increase and place the subwoofer for most even coverage, as long as you can achieve the SPL goals.

Practical distributed sound system installations almost always require the ability to handle multiple signal inputs. Pages may originate from two or more sources, the telephone system and a hand-held microphone, for example. Background music from two selectable sources, with muting keyed to the paging input(s), may also be required. There may even be a need for a low- level noise-masking signal mixed in with the other signals at a consistent, adjustable level.

For these reasons, combined mixer/amplifiers are commonplace in sound contracting. Designed to handle several audio inputs at different signal levels and source impedances, such units incorporate mixing and automatic muting along with amplification. By efficiently consolidating often-used functions in a single enclosure, they greatly simplify routine installations, reducing costs and increasing reliability.

In this article, we examine the criteria for selecting mixer/amplifiers, describe the range of alterna- tives offered by ElectroVoice Sound, and suggest applications for each. Our aim is to encourage appropriate equipment choices to maximize both profitability and customer satisfaction.

Analyzing the Application

The first step in selecting a mixer/amplifier is to examine the demands of the application. What are the intended uses for the system? Will background or foreground music be required in addition to paging? If so, from what type of source: FM/AM radio, tape, or both? Where will pages

ElectroVoice/Dynacord BGM Guide

Page 21

Stereo System specifications

The Dynacord Stereo System is a remarkable audio solution designed for audiophiles and professionals seeking superior sound quality and versatility. Renowned for its exceptional engineering, Dynacord emphasizes clarity, power, and precision in all of its products, and this stereo system is no exception.

One of the standout features of the Dynacord Stereo System is its advanced digital signal processing technology. This allows for precise tuning of audio output, ensuring that users experience optimal sound quality regardless of the input source. The system includes various presets tailored for different environments, whether it’s a small room or a large auditorium. This flexibility makes it ideal for both personal and professional settings.

Another significant characteristic of the Dynacord Stereo System is its robust build quality. Constructed from durable materials, the system is designed to withstand rigorous usage, making it a reliable choice for mobile DJs, event organizers, or even studio applications. Additionally, the aesthetics of the system are both modern and stylish, fitting seamlessly into any décor.

The Dynacord Stereo System also features a powerful amplification system. With a high output capacity, the system delivers rich, dynamic sound that fills the space without distortion. It supports a wide frequency range, allowing users to enjoy everything from deep bass to crisp highs, making it versatile for various music genres.

Connectivity is another strong point of the Dynacord Stereo System. The system is equipped with multiple input options, including Bluetooth, USB, and traditional analog inputs, offering convenience for connecting various devices such as smartphones, computers, and instruments. The Bluetooth capability also allows for seamless wireless streaming, further enhancing its usability.

In addition to its audio performance, the Dynacord Stereo System includes user-friendly controls and settings. The intuitive interface allows for easy adjustment of volume, tone, and effects, making it accessible for users of all experience levels. Whether you’re a casual listener or a seasoned sound engineer, the Dynacord system caters to all.

In conclusion, the Dynacord Stereo System stands out with its exceptional sound quality, durable construction, versatile connectivity options, and user-friendly features. This system is not only designed to meet the needs of audio professionals but also aims to enhance the listening experience for everyone. Whether at home, a concert venue, or on the go, the Dynacord Stereo System delivers a powerful performance that truly elevates audio enjoyment.