An introduction to computer audio
Bluetooth is a popular way to connect devices wireless. Mouse, keyboard and other peripherals, when connected wireless it is by Bluetooth.
In audio Bluetooth is often used to connect a player and a headset wireless.
Often this is done by plugging a Bluetooth dongle in the headphone out of the player.
In this case, the audio is converted from analogue to digital, send to the receiver and converted to analogue again. Not exactly an audiophile's paradise.
Best audio quality is obtained using the A2DP protocol.
It supports the following Codecs:
SBC (sub-band codec) is mandatory.
This profile limits the available maximum bit rate to 320kb/s for mono, and 512kb/s for two-channel.
In essence high bit rate MP3 but vendors can implement their own protocols.
With a nominal bandwidth of 3 Mbit/s (2.1 + EDR) it is not really suit for high resolution audio.
A proprietary codec by CSR
As it is not a mandatory part of the standard you need both a sender and a receiver supporting this protocol.
It is a lossy protocol but said to improve sound quality wise on SBC
Sennheiser MM550 Bluetooth headphone and BTD 300i adapter with APT-X codec.
Creative Zen X-Fi 3 audio player with APT-X codec.
Creative Bluetooth USB adapter with APT-X
Sleek SA6 and Wireless W-1
SA6 can be used wired too
Sennheiser MX W1
Arcam rWave USB dongle with KLEER wireless technology
A2DP Bluetooth Stereo device
Price: € 69,00
Bluetooth reciever supporitng the aptX protocol.
Amp with up to 16 Bluetooth inputs