This amplifier is based on recycled OPA541 chips. They have been previously used in RF modulators to control a CERN electron beam acceleration cavity. This amplifier takes an optical ADAT 8 channel input. A digital to analog converter board produce the analog signal sent to the 8 amplifiers. The sum of the four left channels, and the sum of the four right channels are passed through a low pass filter in order to feed two low frequency amplifiers based on the same chip. These are driving the two subwoofers of the system. This makes a full 8.2 multicanal system mainly made out of free recycled chips. The knobs have been carved out of ebony wood, with brass inserts.