@atmasphere I’ve seen any king of while spectrum noise in different D class amps.. never sine wave! higher freq. though! higher switching freq. amps theoretically should be easier to filter noise out, but again, switching frequency generator has the same reference clock generator issues as any DAC, such as phase noise etc., thus can be heard.
When someone tells you it's a $40,000 amp, does it sound better?
I've always been a little bit suspicious when gear costs more than $25,000 . At $25,000 all the components should be the finest, and allow room for designer Builder and the dealer to make some money.
I mean that seems fair, these boxes are not volume sellers no one's making a ton of money selling the stuff.
But if I'm listening to a $40,000 amplifier I imagine me Liking it a whole lot more just because it costs $40,000. How many people have actually experienced listening to a $40,000 amplifier. It doesn't happen that often and usually when you do there's nothing else around to compare it to.
I'm just saying expensive gear is absolutely ridiculous. It's more of a head game I'm afraid. Some how if you have the money to spend, and a lot of people do, these individuals feel a lot better spending more money for something. Now you own it, and while listening to it you will always be saying to yourself that thing cost $40,000 and somehow you'll enjoy it more.
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@westcoastaudiophile If the output filter is doing its job, all you'll see at the output of a class D in terms of noise will be the sine wave residual that is at the switching frequency of the amp. That typically might be from 500KHz (near the bottom of the AM radio band) up to about 800KHz. Honestly no-one can hear that. What one might be able to hear is knock-on effects from other equipment if the amplifier has spurious parasitics that are messing with that other equipment- RFI can do messy things with audio. But to be fair, lots of tube amps can do this too, through the swept resonance that can occur between the power transformer and the rectifiers installed. We spent a lot of time chasing parasitics in our design. When it was finally ready, when we did the testing of our amp it was the bridge rectifier in the power supply that was making the noise, which we fixed. That is why I said a class D amp can have less spurious noise than a tube amp- whether in the speaker on radiated from the amp through the air or thru the AC power.
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@atmasphere "Honestly no-one can hear that.” sure, if you give me $100,000 budget for output filter alone, I can design output filter with close to 0 Ohm ESR caps and 0 Ohm ESR inductors etc.. :-) what about reference sampling clock purity, do we need $20k World clock device for sampling analog input signal to match class-D amp with the rest of audiophile setup? |
@atmasphere "But to be fair, lots of tube amps can do this too, through” I wish you (really) good luck matching tube amp with D-class Amp! |
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