I started building amplifiers several years ago and PC's several years prior to that. My interest has been combining the amplifier and PC into one chassis to create the Pi-Amp (PC Integrated Amplifier). This job will chronicle building the bi-amp version. Bi-amping is the process of splitting a line level audio signal into a bass and treble component, using an active crossover, and amplifying the resulting line level signals (four signals in the case of stereo). The alternative to bi-amping is splitting the amplified signal into bass and treble component, in the loud speaker enclosure, using a passive crossover. Bi-amping greatly improves fidelity because passive crossovers present the amplifier output with varying impedance due to the presence of the inductor. Below is a concept drawing. The overall dimensions of the chassis are 18" W x 11" H x 16 1/2" D. Slightly wider than the standard audio enclosure. The chassis is designed for optimal placement of PC and amp components to prevent problems with heat and electro magnetic interference. I began the construction by cutting all of the chassis components from a single sheet of aluminum, 5052, 2' x 3' x 1/8" and a stick of aluminum angle 3/4" x 3/4" x 1/8" x 8'. The plate and angle were cut using a table saw and a carbide tipped, non ferrous blade. The 1/4" wide ventilation slots were milled with a plunge router and spiral "o" flute carbide bit. The next step will be drilling about 60 holes and assembling the chassis using machine screws (most of them counter sunk).