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Suggestions For Choosing The Best Wireless Audio Transmitter Device For Whole-House Audio Streaming
Recently more and more wireless audio transmitter devices have appeared which claim to bring the ultimate freedom of sending music throughout the house. We will look at various products and technologies to find out in how far these products are practical for whole-house audio applications and what to look out for when purchasing a wireless system.
If your home is not wired for audio then you face quite a problem when you want to get your music from your living room to your bed room. Frequently the audio source cannot be moved. Running speaker wires between rooms will be costly and for that reason many people are looking for other options. There are a number of technologies solving this problem. These include infrared wireless, RF wireless, wireless LAN (WLAN) and powerline.
Infrared is limited to line of sight since the audio signal is broadcast as lightwaves and consequently devices using this technology, such as infrared wireless surround sound products, are limited to a single room.
RF wireless products will send the signal as RF waves. These waves can easily penetrate walls. RF wireless audio devices either make use of FM transmission or digital audio transmission. The least expensive choice is FM transmission. Products using FM transmission, on the other hand, have a number of drawbacks. These include degradation of the audio quality due to static or hiss and audio distortion. In addition, FM transmitter products are also rather prone to interference from other wireless transmitters.
Digital wireless audio transmitter devices, such as products from Amphony, make use of a digital protocol. The audio is first converted to digital data before being transmitted. This conversion and transmission in the digital domain will make sure that the original audio quality is maintained. On the other hand, this is only the case of the data is sent uncompressed. Some wireless audio transmitters will apply some form of audio compression. Such products include Bluetooth audio transmitters. Audio compression will degrade the quality of the audio to some extent.
Products using wireless LAN are useful when streaming audio from a PC. Their disadvantage is that they typically have some fairly high latency, i.e. the signal will be delayed by some amount since wireless LAN was not specifically designed for real-time audio streaming. WLAN receivers frequently do not have built-in network access. As a result, such devices frequently require buying separate LAN cards. These cards are then plugged into every receiver.
Powerline devices employ the power mains to distribute music and offer great range but run into trouble if there are individual mains circuits in the home in terms of crossing between circuits. Another challenge facing powerline products are strong power surges and spikes. Such surges can bring about drpouts in the audio due to errors in the transmission. To safeguard against these errors, powerline products commonly build a delay of several seconds into the transmission.
Here are some suggestions for selecting a wireless audio system: If you plan to stream audio into numerous rooms of your house, be certain to pick a system that permits streaming to multiple receivers at the same time. That way you don’t have to buy a separate transmitter for every receiver that you are streaming to. Products with some type of error correction will be more immune against radio interference from other wireless transmitters. Select a digital RF transmitter to preserve the original audio quality, ideally one with an audio latency of less than 10 ms in case of video or other time-sensitive applications.
Select a transmitter that has all the audio inputs you need, such as speaker inputs, line-level RCA inputs etc. Get a wireless system where you can buy additional receivers later on. You should verify that you can get receivers for all the different applications you have. Such receivers may include amplified receivers for passive speakers or line-level receivers for active speakers. Given that you may want to connect the transmitter to several sources, you should choose a transmitter that can be adjusted to different signal volume levels to prevent clipping of the audio signal inside the transmitter converter stage.
Check that the amplified wireless receivers contain built-in digital amplifiers with low distortion figures. This will keep the receiver cool due to high amplifier power efficiency and offer optimum sound quality. Check that the amplified receiver can drive speakers with the desired Ohm rating and that it is small and easily mountable for easy installation. 5.8 GHz wireless products typically have less problems with interference from other wireless transmitters than devices working at 900 MHz or 2.4 GHz.
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