A single volume control for active 3-way speakers using Sure / Wondom DSP board

I'm working on a pair of active 3-way speakers.
Each speaker will have it's own Sure / Wondom ADAU1701 DSP board,
and separate class D amplifiers per channel.

I want to have one volume knob to control both speakers' output.

Is it okay to apply attenuation to the signal before it goes into the DSP,or will that affect audio quality?
 
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