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About phase droops

"The 6SL7 drives the 2A3 with an
F3 of 80KHz which means that the HF
will be affected from 8KHz and above.
While flat at 20KHz the phase isn't."

It will be a fine OPT that can do 80 KHz -3dB bandwidth, not even getting on to the speaker issues.

It really should be more of a concern about ratio'ed phase matching rather than absolute phase fidelity through 20 KHz. That's because there's more that can be done to match the phases than can be done to extend the amp's flat phase response. If the left and right out of a speaker pair is well phase matched to the listener's ear, where at 20 KHz left is -32.3 degrees and right is at -32.4 degrees, then it's a good bet that there will be good imaging because timing is nearly identical.

I would wager that left = -10 degrees and right = +10 degrees would be worse to the sound than -32.3 and -32.4 degrees respectively. Speaker designers who know what they're doing will not attempt the former as much as the latter, by driver parameter and crossover component value matching.

And there are those guys like Siegfried Linkwitz where left = right = almost 0 degrees, through electronic correction techniques. Better for some, too much op amp signal processing for others.

-Kurt




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