I don't know of any 3 or 4 zone amps but there are 6 zone amps out there. Namely the Parasound Zonemaster and the Sherbourn 12/900. I owned the Sherbourn unit and thought it was a very capable amp for multi zone usage. Nice, neutral sound and quite powerful. It was rated at 50WPC @ 8 ohms and 100W @ 4ohms but it sure sounded like more. I assume that these specs are conservative. The Parasound is rated the same. Hope this helps some.
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