The sound rack. Starting at the top.... Audio Control real time analyzer. CD player. Dolby CP65. Marchand electronic crossovers for biamping. Three SAE A202 power amps (left, center, right) An SAE A502 power amp bridged for the subwoofer. Out of sight are a pair of Kintek power amps for the surrounds. The rack was a surplus unit that belonged to the FAA. I bought it for $25 and gave it the Krylon treatment