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coupling cap value

Into higher impedances a larger coupling cap isn't helping.

1600Uf into a 16 ohm load the low frequency -3dB cutoff is about 6Hz. If the impedance is 50 ohms its about 2Hz.

But we can see from this that if the output coupling cap was less, there would have been phase shift well into the upper bass; the ear perceives that as a loss of impact.

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