ADA Amp Explores a Different Kind of Cool

The world-beating PTM series power amps from Audio Design Associates include six- and eight-channel models but nothing in the more popular seven-channel configuration -- till now. The PTM-7150, at 150 watts into eight ohms and 250 into four, uses a new thermal design that combines the company's traditional fan-cooled approach with heat sinking. The amp monitors itself and the fan kicks in when needed. This makes for a quieter, albeit larger, amp that needn't necessarily be banished to a closed gear closet. Price $10,000. Incidentally, the PTM is a tribute to ADA cofounder Peter T. McKean. We still miss him.