What do you NOT like about the Mac? It certainly has enough power and current. Current is over 60 amps per channel and probably closer to 90 amps.
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Looking for a better top end and midrange. That 602 has an iron like grip on the lower registers, the McIntosh 'house sound' needs to get changed up. While the mac has served me well for many years, it's time to move up the food chain. I have a secondary system i can move that into and enjoy it there or may just put it up for sale here, not sure the existing cabinetry can handle a 180lb amp!
I have not heard those particular Mac models but the Bryston 7B series monoblocks would be good options. I wouldn't consider them an upgrade per se but more of a lateral move with a different sound signature, e.g., tighter bass, more balanced and not quite as warm. I personally prefer the Mac house sound. You should definitely try it in your system before making the switch.
3.7i cannot be biamped.
I agree that Mac gear can be bettered.
I use my old 4B-SST² with my new Magnepan 20.7s.
(Just got them.)
When I can again afford a big spend I may get the Bryston 7B3 as, Bryston is the #1 recommended amp to pair with Magnepan.
Sorry I have no experience with the amps the op is interested in.
I mainly posted to brag about my speakers, and mention the 3.7i cannot be biamped (nor can the 20.7)
I’ve been powering my older 3.6 Maggies for 10 years with a pair of Bryston 7BSTs (a long time for me to stay with the same components). Aside from the well known, slightly weak low bass (compensated for in my system with an REL Stentor sub), the Brystons allow the Maggies to be everything they’re meant to be, with ease—a textbook example of clarity, immediacy, spacial definition, detail, end every other quality the speakers are designed for, with power to spare. My equipment predates yours by many years, but I’ve never had (nor heard) an amp/speaker combo that sounded better, certainly nothing near their price point. Some day, when I update to the 3.7 (or, in my dreams, the 20.7), I’ll stick with my trusty Brystons (though perhaps in a more modern incarnation if I win the lottery).