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I've got my Class D amp powered by an SMPS, and there is no hum (that I can hear) generated by that. I don't remember the model number (I think maybe 500R?), or much in the way of details about it (I ordered it from somewhere in Europe I think, quite a while back), but it was easy to install and hook up. Maybe that would solve your issue?
Do you have any fluorescent lights nearby? Sometimes when the ballast goes bad, the ballast hums and introduces hum into the circuit. My SDS amps were humming and Tom brought this up as a possibility. I typically don't use my fluorecscent lights while listening to music. About a month later, I have a small flurorescent lit sign over my turntable that started to mum audibily. When I shut it off, the amp hum hasn't been back since. The sign wasn't making any noise shen I talked to Tom but I have to bellieve the ballast was going bad and addiing noise to the amps anyway.
Could also be dc on your line. Some amps and toroids are more sensitive to this than others. Maybe take it to a buddy's place. There are devices that treat this.
I'll do some experiment when the hum coming back again, coz I have no idea when it come, it takes a while for the hum to goes away. Thanks!
To me an amp should not be treated like that. It should just work with a simple power chord. To buy other treatment products, I also not sure whether it works, could end in give more problems than solving it.
So my one is linear PSU? How much you bought? Is it this one?http://connexelectronic.com/product_info.php/products_id/118
Problem is your power, not the amp. Maybe another household device is putting dc on the line, or it is something from your home's wiring or the power coming into your house. If everything is up to spec, DC should not be on the line.Have you tried it on other outlets in your house, or at a friend's house? Also make sure the toroid is sufficiently tightened down.
Something like the Humdinger from Van Alstine can fix the problem. If it doesn't work, there is a 30 day return policy.
Has anyone changed over from unbalanced to balanced input, and if so, was the improvement audible and significant? Is it just a matter of removing the two jumpers next to the input terminals (and using XLR inputs)?
Also, has anyone directly compared the SDS to Hypex NC-400?
Looks awesome, Marcus, thanks for posting! Kinda makes me wish I hadn't sold my ClassDAudio amps!
Why do you sold the ClassDAudio Amps ? What's your actual amps ?