True you would need a 2Ch external amp if you wanted a total of 11 speakers for the AVANTAGE RX-A3080.
But I don't know if that's a disadvantage or dis-AVANTAGE. Haha.
No seriously, as some of you know, I hate having a lot of amps inside these AVRs. With heat being the enemy, I don't think it's a good idea to stuff 11Ch or 13Ch of amps inside these AVRs. If it were up to me, 5Ch amps inside AVR would be max. Or even ZERO amps inside the AVR. Good thing it's not up to me.
It would be nice if Yamaha could make smaller and less expensive amps like the Marantz 2Ch, 5Ch, 7Ch amps.
But one question I get asked on this top is, what amps do you recommend for these Yamaha AVR if someone wanted to add more speakers?
I think getting something like the Yamaha A-S301 Integrated 60W x 2Ch Amp ($300) might be one option. At least that's what I would do since I prefer to keep everything "matched up". And the A-S301 also looks really nice for a cheap amp.