On Fri, 11 Nov 2011 09:03:36 -0800, DaveC wrote:

Here's the whole thing; DC coupled mixer with a charge pump for a
negative supply:
[J. Fields]

Thanks John. Nice design.

What part is used for SW1-3?

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A 4066 would work well.
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Purpose?

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Anti thump
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If these are "anti-thump" turn-on
suppression switches, I think the main amp is similarly turn-on delayed. Of
course it's important to know the timing of these to avoid any window through
which the sub's cone could launch (or lunch?)...

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The output delay, from turn-on, is determined by R11 and C5.

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JF