Why does the cable connecting the Audio Design Associates MPS-502 amp to its external power supply resemble a thick piece of plumbing -- like the pipe under your bathroom sink? Well, it has to carry 100 amps of current, so it can provide five channels with 450 watts each. Introduced in 1992, this was the amplifier on which THX based its amp spec. Throw in the PF-2502 to bring the system up to seven channels. In the present day, ADA is shipping two pre-pros, the Suite 7.1 ($5500) and Cinema Rhapsody Mach IV. You can buy the latter for $4100 but you'd be better off paying $7500 for the version with Trinnov auto setup and room correction. Trinnov will also be built into a separate equalizer product, the TEQ-1. (We are looking forward to trying Trinnov in the long-awaited Sherwood R-972 receiver.)