Multi channel volume controller, active filtering and multi amp

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Hello Evryone,

I'm working on an active filtering system :
- Jriver, convolution as
- Terrateck usb card with 6 analog output
- 3 amps
- two 3-ways loudspeaker

Well my need are to add a central volume controller.
I suppose a good "place to be" could be between the DAC output and the amplifier.

I would prefer a central controler for the two loudpseaker. But if it's cheaper or easyer, I'm ok with one controller by loudspeaker.

But how, in 2018, to do that ? What is the best options ? Did you know any schemas, any board ?
I see a board based on PGA4311, seems a little bit old and I found the board a little bit exepensive.

Thank you in advance.
 
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