Sennheiser HD 660S2 vs. HD 600 and 650: Which is REALLY better?

To my ears a tube amp actually reduces the 650’s bloat and replaces bloat with harmonics. I can’t stand the 650 on a SS amp. The 600 doesn’t respond the same way, as tubes do tend to boost its bass.

People understood hifi in great detail way back in the 1970s. Ask @pennstac about his gear. Audio is a very mature industry.

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