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 LEVITON 48210-VA VIDEO AMPLIFIER MODULE US $25.00
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 Cables To Go 37022 20WPC 8 ZONE AUDIO DISTRIBUTION AMPLIFIER MODULE US $101.14
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Amplifier Module
Wideband Amplifier Module
New Accessories Make Building Multi-Channel Audio Systems A Snap
Multi-channel audio has become mainstream and vendors have come up with many types of basic and more sophisticated technologies such as wireless surround sound speakers, virtual surround sound to simplify the setup of home theater kits. I will review the latest trends to determine which products actually work. I will also give some advice for choosing the best components.
Many of today’s TVs will be installed as a multi-channel audio system. As traditionally TVs would have built-in stereo speakers, nowadays a number of external loudspeakers are used to let the viewer experience surround sound. In case of 5.1 surround, 6 speakers are used: center, left and right front, left and right rear and a subwoofer. Newer 7.1 systems need a total amount of 8 loudspeakers by adding 2 additional side speakers.
As a result, home theater installations have become pretty difficult. Running cables to remote loudspeakers also is often undesirable because of aesthetic reasons. Part manufacturers have created a number of technologies to simplify the setup.
One approach is reducing the number of speakers by making virtual speakers. This approach applies signal processing to the audio and adds phase shifts and cues to the audio that would ordinarily be broadcast through the remote speaker. The audio is then broadcast by the front speakers together with the front speaker sound components. The signal processing is modeled after the human hearing. It uses the knowledge about how the human ear can determine the source of sound. Due to the signal processing, the viewer is tricked into thinking the sound is originating from virtual remote surround speakers.
This technology minimizes the quantity of needed loudspeakers and avoids long speaker cords but every person will process sound slightly differently due to the shape of the ear. The signal processing is based on measurements which are done using a standard human ear model. If the shape of the ear changes, sound will travel differently. As a result virtual surround will not work equally well for every person.
An additional option for avoiding long speaker cord runs is to employ wireless surround sound kits or wireless loudspeakers. A wireless kit consists of a transmitter and one or a number of wireless amplifiers. The transmitter connects to the source. The wireless amplifiers connect to the remote speakers. Normally the transmitter part will come with amplified loudspeaker inputs and line-level inputs. This provides freedom to connect to any kind of source. A transmitter volume control helps take full advantage of the dynamic range and eliminates clipping of the sound inside the transmitter.
Several wireless products come with wireless amplifiers that connect to two loudspeakers. This still requires cord runs between the two loudspeakers. Other products come with individual wireless amplifiers for each speaker. Entry-level wireless products employ FM broadcast or audio compression that will deteriorate the sound quality to some extent. More sophisticated wireless systems make use of uncompressed digital audio broadcast. To be certain that all loudspeakers are in sync in a multi-channel application, be sure that you choose a wireless system which has an audio latency of just a few milliseconds at most. If the latency is higher than 10 ms then there will be an echo effect which will degrade the surround sound. Many wireless gadgets work in the 900 MHz and 2.4 GHz frequency bands. Some products use the less crowded 5.8 GHz frequency band and therefore have less competition from other wireless products.
A third technology uses side-reflecting loudspeakers. This solution is named sound bars. The audio that would normally be sent by the remote speakers is instead sent by speakers at the front. These front loudspeakers broadcast the sound at an angle. Then the sound is reflected by the side and rear walls and appears to be originating from besides or behind the viewer. The effect heavily is dependent upon the interior, particularly the shape of the room and the decoration. It will function well for square rooms with no obstacles and sound reflecting walls. However, realistic scenarios frequently will be different from this ideal and diminish the effect of this approach.
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