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Class D A07 x class D UcD180 and class AB amp - there are measurable differences on acoustical side

spacevector

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Thanks for the efforts PMA.

Do you plan on making a electrical recording with music material to showcase the audibility of the frequency response errors?
 
F

freemansteve

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Here's the spectrum with the NCore (D) and for comparison an Adcom GFA-555 (AB). Main difference is that the Adcom is slightly noisier (not audibly from 1 meter, but I have the mike close like in Pavel's photo). Tweeter is a SEAS aluminum dome in my main speakers.

Don't preload it by using a 6kHz input signal we can actually hear!
 

Texacate

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Just curious if an FFT measurement was done of the 6 & 19/20 kHz source signals going into (or out of) the amplifiers?
Presumably the harmonics measured at the microphone are the sum of all nonlinearities in the entire signal chain, correct?
 

SIY

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Just curious if an FFT measurement was done of the 6 & 19/20 kHz source signals going into (or out of) the amplifiers?
Presumably the harmonics measured at the microphone are the sum of all nonlinearities in the entire signal chain, correct?
Yes, including the microphone.
 
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