For me, the FRX2 is what I have been looking for in a speaker. It is still breaking in, but so far, so good. My room has a little bit to be desired as far as acoustics, so I moved the speakers out into the room. That helps quite a bit. The modifications to this driver seem to be with the surround, and of course the back of the driver, which houses one of those transformers that I was talking about. For me, it is one of the main selling points since am sensitive to any shout that a speaker might have. I will try to post some photos to give an idea of what I have done so far. Greg