And I'd be happy to do that again...Did you know that measurements for my previous amp were verified by a third party (@SIY)?
https://audioxpress.com/article/fre...d-audio-bosc-and-purifi-audio-eigentakt-eval1
And I'd be happy to do that again...Did you know that measurements for my previous amp were verified by a third party (@SIY)?
https://audioxpress.com/article/fre...d-audio-bosc-and-purifi-audio-eigentakt-eval1
In any case, why do you think his results will be different than mine? We use the same equipment.
As long as his not using A weighting. Although it can be somewhat not technically right. But if you think from human hearing perspective, the harmonics are over 20khz so not audible no matter what amplitude. It would be great if we have an overlay of 90KHz bandwidth measurement here so we can get a better picture. A little deceptive I say probably yes.Impressive @orchardaudio
The THD vs Frequency @10W graph however is a little deceptive IMO.
Clearly your measurement bandwidth is ~20KHz as the harmonics are falling off the plot above 10kHz (the two measurement points at 15kHz and 20kHz). The trajectory of the plot would suggest 0.02%-0.05% THD or greater up to 20kHz...
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Did you know that measurements for my previous amp were verified by a third party (@SIY)?
https://audioxpress.com/article/fre...d-audio-bosc-and-purifi-audio-eigentakt-eval1
Nah. You know what it is.I have other equipment I can send to him like PecanPi USB/SPDIF, he has not responded to my messages. So no.
In any case, why do you think his results will be different than mine? We use the same equipment.
I just wish it came with a power adapter that's safety certified for Australia.
There is no weighing of any kind in any of the measurements that I posted.As long as his not using A weighting.
Yes, the bandwidth is 20kHz.Clearly your measurement bandwidth is ~20KHz
What is the load for this test?
I think this is your best case yet.Here is what the finished product will look like. More info to come.
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Around 750kHz.Whats the switching frequency? 500K-1Mhz i would guess?
However thread title says 500W @4ohm. I don't see that claim verified in the provided data. Give her all full head of steam both channels loaded
Class D amplifier are mostly dominated by noise. So 22KBW 5W will be very different from 20KBW 10W. Probably 6-7dB difference. 8ohm vs 4ohm is another 3dB. (I think you are using 4ohm but this can happen) That's quite a lot at the state of the amplifier which is top tier. Send it to Amir and see what we got.There is no weighing of any kind in any of the measurements that I posted.
Yes, the bandwidth is 20kHz.
The new ultra modules are used with a Hypex power supply the SMP1200 series. Here is their safety compliance document. I see Australia in on the list. More info here: https://www.hypex.nl/img/upload/doc/smps/smps1200/Documentation/SMPS1200Axx0_10xx.pdf
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Class D amplifier are mostly dominated by noise. So 22KBW 5W will be very different from 20KBW 10W. Probably 6-7dB difference. 8ohm vs 4ohm is another 3dB. (I think you are using 4ohm but this can happen) That's quite a lot at the state of the amplifier which is top tier. Send it to Amir and see what we got.
Ah right. 8ohm vs 4ohm is 6db. 5W vs 10W is 3dB. Then noise can contribute 1db or so, can be higher due to spikes or rising high frequency noise but not present here.A decrease in SNR/SINAD of 6-7 dB going from 20 kHz to 22 kHz bandwidth seems like an awful lot... That's a factor of two in voltage noise for 10% greater bandwidth. I do not know either way, just seems high.