Link to a guy who have made some digital volume control tests

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Sonny,
Thanks for the link. Very interesting. Indeed, his approach was very much like a marketing department's. No need to listen to a component, eliminate it because of that 'outrageous' distortion level of .01%. 5532s for buuffers. This is not a criticism, I'm merely trying to point out the dichotomy existing in the hi-end world, objective specification vs. subjective evaluation. No doubt, there is a happy medium, but I found it interesting that all decisions were made as to component selection without listening to them....

I can see it now,

NEKK'D MUD RASSL'N DEATH MATCH!!!

Douglas Self vs. ???????

Any volunteers?
 
Personally, I'd be leery of models which include buffers. However good or bad the attenuation network sounds, a built-in buffer removes that choice from the designer.

One could also consider a 7-relay discrete ladder, perhaps built with those US$0.75 NAIS AgPd/Au-AgPd micro relays that AllElectronics is selling.
 
Worried about BB/TXN?

The author was worried about Texas Instrument's permanence in the audio business. This would appear to be a "de minimis" risk. With respect to Dallas Semi, isn't it typical for distortion to rise with frequency?

I've often wondered why there isn't more use of voltage controlled amplifiers (the CLC series from National Semi come to mind) until I checked on the availability on www.findchips.com -- they just aren't available anywhere. (I got mine from Digikey) I have about a half dozen I intended to use in Automatic Gain Control. The distortion stats would seem comparable to the digitally controlled pots.
 
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