I used the 3A Signatures a few years back with a pair of stereo Theta Dreadnaught I's. I used one amp for each side, left and right with 1 channel driving the upper section and the other channel driving the lower. After evaluating the sound over several weeks, I came to the conclusion that the sound was not as good as using a single Dreadnaught for both channels. For whatever reason, the sound seemed to become a little disjointed like the blend between the upper and lower sections was not right.
Changing back to a single amp brought everything back into focus and the speakers sounded better-actually, noticeably better. That ended my biamping. Biwiring is a must though. It is better.
I have heard that with these speakers, an oscillation can occur because of the characteristics of the crossovers with a biamp. Richard now recommends against biamping because of this possibility. I don't really know if that was in play with my system but for whatever reason it just didn't work out. So I sold the other amp.
Changing back to a single amp brought everything back into focus and the speakers sounded better-actually, noticeably better. That ended my biamping. Biwiring is a must though. It is better.
I have heard that with these speakers, an oscillation can occur because of the characteristics of the crossovers with a biamp. Richard now recommends against biamping because of this possibility. I don't really know if that was in play with my system but for whatever reason it just didn't work out. So I sold the other amp.