Hi;
Thanks for your inquiry. The distortion spectrum on the 2B SST is much like a preamplifier, in that it displays very little second, a tiny amount of 3rd, and the upper harmonics are negligible. The values of the harmonics are very low, in the range of -95dB or less for the third and second, below -100dB for any others even at 20K full power. The harmonics are difficult to discern from the low noise floor at frequencies or power levels below that point.
This is in keeping with Bryston's philosophy. We feel music should be relaxing and emotionally fulfilling to listen to. For that reason we make every effort to make sure the signal is clean and non-aggressive, with essentially linear amplification circuitry that delivers vanishingly low distortion, with almost no upper harmonic content.
I hope the above is helpful, but please let us know if you have any other questions. Thanks for your interest in Bryston audio components.
Sincerely,
Chris Russell
Bryston Ltd.