System Kit
Friday, August 26th, 2011
New Technologies Make Setting Up Home Theater Products A Snap
Setting up multi-channel audio including a home theater system has always been rather difficult and manufacturers recently have created unique products and technologies like wireless speaker kit products or virtual surround sound to help simplify this process. I will look at some of the products and technologies which have appeared and give some advice about selecting proper components for a hassle-free installation.
Traditionally, setting up a TV would be speedy because they would already come with built-in stereo speakers. This, on the other hand, has all changed with multi-channel audio. Nowadays external speakers are utilized to create a surround sound effect. As the traditional 5.1 format requires 6 speakers: a front center, two front side speakers, two rear speaker and a subwoofer, the more recent 7.1 format adds two additional side speakers.
Thus installing a home theater has turn out to be fairly complex and long speaker wire runs are often undesirable for aesthetic reasons. Suppliers have recently introduced new products and technologies. These products were created to help simplify the setup of home theater kits.
The first approach is named virtual surround sound. This technique will take the audio components which would typically be broadcast by the remote speakers. It then applies signal processing to those components and inserts special cues and phase delays. Next these components are mixed with the front speaker audio. The signal processing is designed based on how the human hearing determines the location of a sound. The audio signal is then broadcast by the front loudspeakers. The viewer is in effect deceived into believing the sound is coming from a location other than the front speakers.
Virtual surround avoids the remote loudspeakers and simplifies the setup and also avoids long speaker wire runs. However, it also has a drawback. The form of each human’s ear is somewhat different. For that reason everybody processes sound differently. The signal processing is based on measurements which are done using a standard human ear model. If the form of the ear changes, sound will travel differently. For that reason virtual surround will not function equally well for everyone.
A different solution for avoiding long speaker cord runs is to employ wireless surround sound systems or wireless loudspeakers. A wireless product consists of a transmitter and one or several wireless amplifiers. The transmitter connects to the source. The wireless amplifiers connect to the remote speakers. The transmitter will often come with amplified speaker inputs as well as line-level inputs and have a volume control to adjust it to the source audio level.
A number of wireless speaker systems are designed to connect 2 loudspeakers per wireless amplifier. A superior option would have a wireless amplifier for every remote speaker to eliminate the wire runs between each of the 2 remote loudspeakers. Entry-level wireless kits use FM transmission or audio compression that will degrade the sound quality to some degree. More advanced wireless systems use uncompressed digital audio transmission. In multi-channel audio kits, it is crucial to select a wireless solution with a latency of only a few milliseconds. This will make certain that the sound of all loudspeakers is in perfect sync. If the latency is higher than 10 ms then there will be an echo effect which will degrade the surround sound. Wireless kits frequently use the 900 MHz or 2.4 GHz frequency band. A number of products also use the 5.8 GHz band. These devices have less competition from other wireless devices than devices utilizing the crowded 900 MHz or 2.4 GHz bands.
A third technology utilizes side-reflecting speakers. This option is named sound bars. The sound that would ordinarily be sent by the remote speakers is instead sent by loudspeakers at the front. These front speakers broadcast the audio at an angle. Then the sound is reflected by the side and rear walls and appears to be coming from besides or behind the viewer. The effect heavily depends on the interior, especially the shape of the room and the decoration. It will work well for square rooms with no obstacles and sound reflecting walls. However, realistic scenarios frequently will be different from this ideal and reduce the effect of this option.
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