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In Reply to: Re: The elephant in the room... posted by AJinFLA on March 5, 2007 at 09:52:58:
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.
Sorry to hear about the neighbor :-). Sounds like you need some circuit isolation there.
I'm taking along hard look at the 41hz Tripath kits as well as the ICE class D's at DIYCable. Too bad Tripath bit the dust, although I would imagine there is decent inventory out there, although for how long...?
Also too bad...is that the Gilmore Amps don't come with that chick that poses with his Carver clone speakers. Ay-Caramba!
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