AES: Evaluating Electrolytic Capacitors Specified for Audio Use

[Joachim Gerhard]

I designed that with Bill Waslo. It really sorts an end to subjective opinion. When you like Distortion, that is ok for me but please do not tell me you like inaudible Distortion but can not prove it.

 

[Joachim Gerhard]

By the way 0,1% distortion ( preferably low order ) from microphone to speaker ( say over 200 Hz ) is maybe impossible to achieve.

 

[john curl]

No coupling cap is the best cap! Hi Joachim.

 

[Joachim Gerhard]

Sure, and that is not a real problem from the standpoint of circuit design. On the other hand I am quite surprised how well the recent circuit sounds that I build with a single supply and coupling caps at input and output. Maybe the spectrum with dominant second Is an advantage or the inherent simplicity.

 

[Joachim Gerhard]

The next circuit I show on the MPP thread is single supply and does not have an input cap.
Then I go to a parallel symmetric circuit that does not have an input and output cap. All circuits have around -100dB distortion and I plan to compare the results.

 

[jan.didden]

Read this and you will be astounded....

That's a very nice article Joachim! I gets really interesting after the line where you cut it off ;-)

Distortion Isolation in the Time Domain.

Jan

 

[Markw4]

Kind of overlooks the fact that some audible distortion is only quasi-stationary, thus hard to fully capture by methods assuming otherwise?

 

[Mark Tillotson]

I have not read the entire paper, but it appears they are testing within a circuit rather than in isolation.

The only thing you can test in isolation is mass and dimensions.... Of course things are tested in circuit! Datasheets are often full of test circuits to document the test methodology (more commonly for chips than passives, but you can see the test equipment is identified in many datasheets (the good ones?). And guess what, a piece of test equipment is a circuit (!)