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The amps I'm using have linear supplies.

I'm using the Gilmore Raptor amps, with big toroidal transformers and (I think) fast-recovery diodes in the bridges. These supplies are quiet except when my neighbor is using her hair dryer: the DC on the power line makes them buzz.

The transformers also have a vertical vibration mode on the case bottom plate, that I've fixed by placing the amps directly on solid wood supports. The InnerSound amp I used to have had the same issue.

It should be possible to reduce the noise from switching supplies, to improve the performance of amps that use them. Extensive magnetic shielding and appropriate filters on all wires would be an improvement over placing the supplies on the same boards with the amps. I don't know if this would make the supplies as quiet as good linear supplies; we'll have to see if someone develops such an amp.

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