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Newest Accessories Make Setting Up Surround Sound Products A Snap
The process of installing multi-channel audio speakers in home theater products is rather tedious and suppliers have invented new products and technologies such as wireless surround sound speakers or surround sound wireless headphones recently to help simplify the installation. I will have a look at a number of of the products and technologies that have emerged and give some advice about picking appropriate components for a hassle-free setup.
Most of recent TVs will be set up as a multi-channel audio system. Whereas historically TVs would have built-in stereo loudspeakers, nowadays a number of external loudspeakers are used to allow the viewer experience surround sound. As the traditional 5.1 format needs 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.
Consequently, home theater setups have turn out to be rather complex. Running cables to remote loudspeakers also is often undesirable due to aesthetic reasons. Several technologies have emerged to simplify this procedure.
One option is minimizing the quantity of speakers by creating virtual loudspeakers. This technique applies signal processing to the sound and adds phase shifts and cues to the audio which would ordinarily be broadcast by the remote loudspeaker. The signal processing is designed based on how the human hearing determines the location of a sound. The sound signal is then sent through the front loudspeakers. The signal processing has an effect that will deceive the listener into assuming that the sound is originating from a different location.
This technology reduces the number of needed speakers and avoids long speaker cables but every human will process sound somewhat differently due to the form of the ear. Because the signal processing is based on a standard human ear model, virtual surround will not function equally well for every person depending on how much the viewer differs from the standard model.
Wireless surround sound products are one more option for simplifying home speaker installations and normally include a transmitter module that connects to the source and also wireless amplifiers which will connect to the remote loudspeakers. This transmitter will typically provide line-level as well as amplified speaker inputs. Ideally it should come with a volume control to adjust it to the audio source.
Some wireless speaker devices are designed to connect 2 loudspeakers per wireless amplifier. A better solution would have a wireless amplifier for every remote loudspeaker to get rid of the cord runs between each of the 2 remote speakers. Entry-level wireless kits use FM broadcast or audio compression that will deteriorate the audio quality to some degree. More sophisticated wireless devices use uncompressed digital audio transmission. In multi-channel audio products, it is vital to pick a wireless option with a latency of only several milliseconds. This will ensure that the audio of all loudspeakers is in perfect sync. If the latency is higher than 10 ms then there will be an echo effect which will deteriorate the surround sound. Some wireless devices operate at 5.8 GHz which offers the benefit of less competition from other wireless products than devices using the crowded 900 MHz or 2.4 GHz frequency band.
A different method, which is often referred to as sound bars utilizes side-reflecting loudspeakers. The audio that would normally be sent by the remote loudspeakers is instead sent by speakers at the front. These front loudspeakers send 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 result heavily is dependent upon the interior, especially the shape of the room and the decoration. It will function well for square rooms with no obstacles and sound reflecting walls. Then again, realistic scenarios frequently will differ from this ideal and diminish the effect of this solution.
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