I run 5As in a 17x27x10 foot room with some absorption room treatment. Amps are ARC Ref110 and Ref 210 monos. The Ref 110 is enough as were Pass Aleph 2 monos (100W class A) but the extra head room of the Ref 210s is nice to have.
I remember reading that the 7s work fine with a 100 watt amp. But the reported sensitivity number of the 7 is lower than the 5A and the impedence is also a tad lower. I would want more than 100 watts for the 7s in a large room.
Maybe I have gotten use to the 5As, but I don't find the image height significantly lacking with analog playback. In fact, if the image seems kinda "short" I find it to be evidence that I need to tweek the VTF and or VTA on my arm.
But no doubt there are other speaker designs that make a taller sound stage.
Terry
I remember reading that the 7s work fine with a 100 watt amp. But the reported sensitivity number of the 7 is lower than the 5A and the impedence is also a tad lower. I would want more than 100 watts for the 7s in a large room.
Maybe I have gotten use to the 5As, but I don't find the image height significantly lacking with analog playback. In fact, if the image seems kinda "short" I find it to be evidence that I need to tweek the VTF and or VTA on my arm.
But no doubt there are other speaker designs that make a taller sound stage.
Terry