Secrets Q&A with John Siau

[PierreV]

Well, that 125ASX2 was already relatively noisy in the audio band anyway...

ICEPower 125ASX2 Class D Amplifier Review

This is a review and detailed measurements of a DIY amplifier based on ICEPower 125ASX2 module in Ghentaudio case. It is on kind loan from a member. The owner says the total cost is only US $220. I can't find the amp at the price he bought it so maybe it costs a few dollars more but still, it...

www.audiosciencereview.com

 

[Pdxwayne]

Well, that 125ASX2 was already relatively noisy in the audio band anyway...

ICEPower 125ASX2 Class D Amplifier Review

This is a review and detailed measurements of a DIY amplifier based on ICEPower 125ASX2 module in Ghentaudio case. It is on kind loan from a member. The owner says the total cost is only US $220. I can't find the amp at the price he bought it so maybe it costs a few dollars more but still, it...

www.audiosciencereview.com

According to post #19, it got worse after 20khz....

 

[Ra1zel]

I see lots of noise below 50khz. Any concerns for speakers that could go up to 45khz?

Yes but only if you are a bat listening to recordings of other bats

 

[Pdxwayne]

Yes but only if you are a bat listening to recordings of other bats

I think I read somewhere that noises above 20khz can cause issue to tones below 20kz....

 

[sq225917]

They can, but whereas we can clearly discern a 100hz difference plus minus 500hz we can't hear the same modulation at the same level at say 19khz plus minus 100hz.

Our ability to discern frequency modulation is inversely proportional to the fundamental frequency