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If you find there is nothing wrong with the amp, it could be pre clip warning.
The Mirage M1’ are a great speaker and this 4B should be fine, the M1’s do have a nasty 5ohm combined with -45 phase angle at 60hz but the 4b should handle this.
The Bryston is dc coupled, I think maybe you could be getting warp frequencies or subsonic rumble arm resonance coming through from your t/t phono stage setup, I don’t know what bass mode means on the Holman pre, but it looks like it maybe a rumble filter, see if that cures it.
If that’s no good, then try cd player and a different preamp see if it cures it.
This is one of the reasons why I gave up on the Bryston 3BST awhile back because it didn't take much volume to get it to clip and I was using very efficient speakers at the time, figurer that one out. Go for a Conrad Johnson or McCormack amp (solid state), then you could put that problem behind you. Thanks for your time!
In this this instance, I suspect it may have more to do with the age of the unit and potentially the non-Bryston work done on it. It really does sound excellent and I'm hopping to resolve it and keep the unit. At this point, it's only the green lights blinking and I have not seen anything (anywhere) on line with a condition similar.
PHD, I owned both 3BSST and 4BSST, and never had a problem, even when I abused the 4B. Before I bought, I talked to someone at the factory, burned an hour of his time, and he invited me to call back if I had more questions. It was the president.
I guess that your mileage has differed. Sorry to hear that.
terry9, it could be that the earlier models of the Bryston amps (B, BST) did not have the headroom that the more current amps (BSST) have, but you said you also owned the earlier 4B and thought it did not have this problem. We need to look at the listening habits and go from there. Not everyone on Audiogon is listening to classical music at low volumes. Some other types of music demands higher volumes just to sound good.