AAVA volume control - Accuphase circuit designs

[Wes]

To what extent is this an advantage over other analog volume controls? (not digital, just the analog volume controls)

http://www.accuphase.com/aava.html

 

[JeffS7444]

1. Justifies the high price
2. Allows precise L/R tracking accuracy
3. Probably easier to remote-control
4. Avoids the hassle of too-coarse steps typical of regular stepped attenuator

But some clever designers came up with an easier solution to #2 and #4 which was to design their circuits to use linear potentiometers which are lots easier to build with precise tracking than logarithmic potentiometers.