In this project [Ryan] shows how he added Bluetooth audio to the stock stereo of his Toyota Matrix. The work he did with his add-on hardware is quite good. And the installation was surprisingly easy.

He pulled off a fairly complicated hack which now lets him control speakers via Bluetooth. He had a set of Creative brand computer speakers with a volume potentiometer that needed replacing.

A device that enables any Bluetooth source to send signals to a powered speaker or to the amplifier in a sound system. A Bluetooth audio adapter is also called a Bluetooth audio "receiver." ...