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A Look At Some Of The Hottest Wireless Audio Devices
Recently a great number of wireless audio devices have appeared such as latest-generation wireless headphones, iPods, cell phones and wireless amplifier products that promise to eliminate the cable. We will look at some of the latest products to figure out which applications they work for.
A number of products come with wireless already built in while some others, specifically streaming audio products, often have optional wireless capability. Most recent touch-screen iPods and iPhones already have WiFi and Bluetooth built in.
The Bluetooth protocol is a fairly low-cost option. However, its limitations have an impact on high-quality audio applications and are often ignored.
1) Limited operating range
Bluetooth devices normally just have a 30-foot range which limits Bluetooth to single-room applications.
2) Limited data transmission capacity
Bluetooth reliably supports data transmission rates of about 1 Mbps only which is not enough for uncompressed CD-quality audio. For that reason Bluetooth applies audio compression. The audio will be degraded to some degree because of the audio compression. For this reason higher-end audio equipment normally does not use Bluetooth wireless audio.
3) Audio delay
The audio will experience a delay of at least 10 ms for the most part because of the audio compression which is a problem for real-time audio applications but less critical for MP3 players.
4) Lacking multi-headphone support
Bluetooth does not support any number of headphones which might be a problem if you have a larger number of people who want to listen to headphones from a single transmitter device.
WiFi is an additional commonly used wireless protocol that is also suitable for audio streaming. WiFi does support uncompressed audio but will have problems broadcasting to a large number of wireless receivers simultaneously. It is convenient for streaming music from a PC as a result of the high availability but is usually not used in wireless headphone devices due to the relatively high power consumption of WiFi.
Wireless speakers and wireless amplifier products for home theater speakers usually employ their own proprietary protocol. Entry-level wireless headphones and speakers generally still utilize FM transmission which offers low cost but is susceptible to noise and audio distortion.
More advanced wireless protocols are based on digital formats which get rid of audio distortion and incorporate advanced features including error correction to deal with interference from competing wireless devices.
Sophisticated wireless amplifier devices support uncompressed digital audio streaming to preserve the original audio quality. A few of these protocols permit streaming to an infinite number of wireless amplifiers which is convenient for whole-house audio distribution.
The audio latency ranges from below 1 ms to up to 20 ms. A small latency is key for wireless surround sound applications. Wireless audio transmitter devices usually operate at 2.4 GHz or sometimes in the less crowded 5.8 GHz frequency band including Amphony's wireless audio products.
These wireless amplifiers also differ regarding amplifier output power, standby power consumption and audio quality. A high-quality audio amplifier is vital for optimum sound quality. Digital amplifiers typically offer a power efficiency of at least 80% and standby power consumption of less than 5 Watts which keeps them cool during operation and helps save energy. However, some Class-D amps have rather high audio distortion. Picking a low-distortion amplifier is important. Good-quality wireless amplifiers have audio distortion of lower than 0.05%.
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