I can only speak from a similar experience. I had been using a Mcintosh MC7205 5 channel amp and decided to get a Mcintosh MC352 2 channel amp for the front. This resulted in a much improved sound but the 352 added a 150 watt advantage. But the 7205 is running considerably cooler with a channel idle between each used channel. I feel that the two channel amp isolated the power supply usage and lets the two channel listening be a little more pure in reproduction.
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