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In Reply to: Re: Or maybe I have already learned and found some of the answers you are seeking? posted by Thorsten on January 06, 2002 at 08:00:56:
Hi Thorsten,
That's very interesting as I found my discrete opamp outperform the AD811 and the OPA627.
Yes the ambiguity of subjective evaluation is a problem, as f.a. I am not in contol of my own biorhytm etc. But in the end it is the gorgeous sound that counts , not the specs or the measurements.
ELSO
Follow Ups:
Hi Elso,One more question on this. Do you ever try to evaluate active or passive components in the classic wire bypass test? If not then maybe some of our differences in experience/view stem from that. To me it is one (but not the only) test I like to do.
Later T
Hi Thorsten,
One can not compare a amplfier with a straight wire bypass as the wire has no gain!
How would you compare the AD811 as a IV converter with a straight wire?? The wire does not convert current to voltage.
I did compare coupling caps this way and this led to the omission of a lot of coupling caps in the DAC and preamp. Best cap is no cap. From the current output of my DACchip(AD1865) to the poweramp I have not one coupling cap!
I usually try a new part in my circuit and live with it for a while. Then change back to the original situation.
Later....?
ELSO
Hi,I think it is a valid comparison to see how much a given part/circuit will colour the sound. If different gain is present you need to match that somehow, which of course introduces problems of it's own.
I still feel it worthwhile to try such procedures, as they give you a hande on the "sound" of a device/topology as much on it's own as is possible. I draw most of my design/modification elements from that type of test combined with in circuit comparisons. I find it interresting that it is possible to "subtract" system sound from the in circuit comparisons and to hear the same sonic signature superimposed that was heard first in the wire bypass test.
Of course, I could be completely deceiving myself and in reallity everything sounds exactly the same and I imagine everything.... ;-)
Ciao T
Elso,
You would need to do the A/B where you do not need gain, say after the IV converter. If you add a circuit after the IV converter and it sounds the same as not having it then the circuit is pretty good(as a buffer). How a circuit behaves as a IV converter might be way different from using it as a unity gain buffer or even as a straight times 3-10 line stage. Lots of high frequency junk coming from a current out DAC. Many circuits cannot handle it. Wadia has a new zero feedback current mirror circuit that they like much better than op amps for their IV converter.Yes, no coupling caps is best, but sometimes a simple circuit with a coupling cap will sound better than a complex circuit without.
By the way, I sent you two CS8420s about one week ago. Did you receive them yet?
Ric Schultz
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