Audio Design Associates (ADA) introduced two versions of a new multichannel power amp at CEDIA—the PTM-7150 (seven channels, $10,000) and PTM-5150 (five channels, $8000). Each one pumps 150Wpc into 8Ω, 250Wpc into 4Ω, and around 600Wpc into 2Ω. It operates in pure class-A mode for the first 50 watts, after which it moves to class-AB, and a patent-pending cooling system uses a high-volume/low-speed fan under the heat sinks to keep the amp cool and quiet.