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"Subterranean" Bass and SETs......

I don't think signal level from the digital source is the problem.... (But I could be wrong.)

"Subterranean" bass takes up gobs of power..... It could be a simple case of the deep bass clipping an 8-watt 300B amp driving 92 dB efficient speakers. Especially where the bass response of the speakers isn't extended. (If I recall, the Reference 3A De Capo is a smallish speaker.)

Since you did build the amp, the only other thing I can think of is maybe the bias is off..... That will cause an SET amp to clip (saturate or cut off) at lower power levels.... And deep bass will bring out the problem.

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