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RE:

Posted by Ralph (M) on December 7, 2023 at 11:15:53

In Reply to: Great Powerful Bass posted by Ampzilla on December 3, 2023 at 13:54:13:

1) A lack of phase shift at 20Hz.

So the amp either needs bandwidth to 2Hz so as to minimize 20Hz phase shift or employ enough feedback that its able to correct phase shift at this frequency.

2) A load that is beneficial to the amp.

If tubes this usually means a higher impedance. If solid state, this really should be 8 Ohms and not 4 Ohms, since the latter causes any amplifier to make more distortion and heat.

3) A low enough timing constant in the power supply such that the amplifier cannot modulate its power supply at the lowest audio frequencies. Barring this, enough feedback to reject the distortion and losses that otherwise occur. Generally speaking, you want the timing constants in the power supply to be lower than those of the amplifier. This can be a bit tricky in an amp that is direct-coupled from input to output, but feedback can correct that if its present in sufficient amount.

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Kimber Kable

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