Its an interesting question. Your 4 is a very powerful amp and should drive your speakers easily (even without the sub amp). Going with a larger Bryston may give you a little better sound but I'm not so shure it will be worth the cost. It may make more sense to look at a different kind of amp all together. Personally, I think Bryston makes a very good sounding amp. Given that, I think companies like Ayre, Pass, BAT and a few others, all make solid state amps that I feel sound better. Keep in mind, though, thats just my opinion. You have to like it. I just think your current amp doesn't need to be upgraded to a more powerful Bryston.
What preamp are you using? That makes just as big a difference as the amp. I feel its even more important, but others will disagree.
What preamp are you using? That makes just as big a difference as the amp. I feel its even more important, but others will disagree.