A bunch of people are using a pair bridged mono to drive speakers like Salon2's that are ~4 ohms nominal. I believe Kal tested into speakers that dip a bit low and had no problems. That is my end-game plan, but I have corresponded with one person using single AHB2 to drive a pair in a larger room than mine and he does not feel the need for more power. I may start with one or use a set to drive all seven speakers, depends on what stock and bonuses look like this year (pretty ugly, unfortunately).
My friend bi-amped using an AHB2 for each Salon2 but felt that driven by the Oppo UDP-205 he wanted more output. He ended up bridging his AHB2's.
The amps were set to high gain so it could be that he was clipping the input, if he clip lights illuminate in this case.
I drove the Salon2's for a while with a single AHB2 with no problems driven by the XMC-1 (high gain) and now the LA4 (low gain).
Using the LA4, one clip-light illuminates (bi-amped bass section) at +15 playing Lorde Royals. It is quite loud.
I still feel there is a bit of added clarity bi-amped, that and my desire for to preserve my hearing, supports this decision.
In short, you may well be happy with the levels provided by a single AHB2. I'd start there.
- Rich