I don't remember this thread. Kind of a delayed response and looks like to late. Sorry. I own the ref150v2 and have listened to the 4bsst but not the 2 at a dealership. The belles is close to really really neutral, clean, with a no artifacts signal and excellent macro dynamics and micro dynamics. On its leading attacks has just very slightly rounded edges which is a similarity with tube amps. Does not really sound like a tubey amp though because it allows the recording to breathe and come alive so it does not sound extra smooth. It conveys whatever imaging, 3d, space stuff really really well. But that is not why I like it. It works fantastic with my speakers and I don't know how it would work with yours. I would not recommend the ref150av2 if the 4bsst2 doesn't make the power needed. I would go to the Belles Reference350v2 for a little more power. I have to say if you can get a used one it will save you a lot of break in time. Mine has taken about 900hrs to become magical. The Bryston from my hearing it is just a slightly different sound. A couple of things maybe I could say from my recollection is the Bryston maybe punchier but probably not more dynamic and maybe less. And the Belles may be just a very slight less dry of a signal. The Bryston might be just a little better built(5%?) inside and out but the Belles still being extremely well built. So I would say the Belles would be a very good unit to try a see if it would work for you. I have heard your speakers but not with my system. They seemed pretty neutral and in that area would probably be a real good match with Belles. Remember that is just my view.
