Recommendations For Choosing The Optimal Wireless Audio Transmitter Device

The latest range of wireless audio transmitter products promises streaming of music throughout the house without limits

. We will look at the most popular technologies for wireless audio and give some tips for choosing the best wireless audio product.

Running music in your house can be a daunting task. Many homes are not wired for multi-room audio and getting the music from your living room to your bedroom can be quite a challenge. Products which solve this problem are usually based on the following technologies: infrared wireless, RF wireless, wireless LAN or powerline.

Infrared products send the audio as lightwaves. Light cannot penetrate walls. Therefore products using infrared, such as wireless surround sound kits, are restricted to a single room.

RF wireless products will broadcast the signal as RF waves. These waves can easily penetrate walls. RF wireless audio products either utilize FM transmission or digital audio transmission. The least expensive option is FM transmission. Products using FM transmission, however, have a series of drawbacks. These include degradation of the audio quality due to noise or hiss and audio distortion. In addition, FM transmitter products are also fairly susceptible to interference from other wireless transmitters.

Products using digital wireless audio transmission, such as Amphony audio transmitter products, use a digital protocol in which the audio is converted to a digital signal prior to transmission. Some wireless audio transmitters will use audio compression, such as Bluetooth transmitters which will reduce the audio quality to some extent. Digital wireless audio transmitters which send the audio uncompressed offer the highest audio fidelity.

WLAN products are practical for broadcasting audio from a PC. However, wireless LAN was never designed for real-time audio streaming. As a result, products using WLAN will introduce some amount of delay to the signal. WLAN receivers often do not have built-in network access. As a result, such products often require purchasing separate LAN cards. These cards are then plugged into each receiver.

Powerline products send the audio via the power mains and offer great range. They run into problems in houses where there are separate mains circuits in terms of being able to cross over into another circuit. Also, these products build in a delay of several seconds to safeguard against transmission errors during power surges and spikes which prevents their use in applications where the audio from wireless speakers has to be in sync with other non-wireless speakers or video.

Here are some tips for choosing the optimum wireless audio system: Try to find a system that can run several wireless receivers from a single transmitter. Ideally an unlimited number of receivers should be supported. That way you don't need to buy additional transmitters when you start adding receivers in different rooms of your house. Products with some form of error correction will be more immune against radio interference from other wireless transmitters. Digital RF audio transmitters will be able to preserve the original audio quality. If you have time-critical applications where sync of the audio is important then you should get a transmitter with a low audio latency. An audio latency of less than 10 ms would be suitable for most scenarios.

Select a transmitter that has all of the audio inputs you need, e.g. speaker inputs, RCA inputs etc. Choose a system where you can add receivers later on which offer all of the required outputs, e.g. amplified speaker outputs, RCA outputs etc. If you go with a digital audio transmitter, choose one with an input audio level control knob to prevent the audio signal from clipping inside the transmitter audio converter. This will ensure optimum dynamic range regardless of the signal level of your equipment.

Check that the amplified wireless receivers have built-in digital amplifiers with low distortion figures. This will keep the receiver cool due to high amplifier power efficiency and provide optimum sound quality. Make sure the receivers can drive speakers with your desired Ohm rating. Picking a product where the wireless receivers have a small footprint and easy mounting options will help during the installation. Products which operate in the 5.8 GHz frequency band will have less problems with wireless interference than products using the crowded 900 MHz or 2.4 GHz frequency band.

by: Brian Fuller.

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