You could Check The Back Panel of your AVR. If there are "Pre-Out" you could connect the pre-out with input of the V3 accordingly (for Front L/R, C, etc) then remove the speaker cables of the connected pre-out channel(s) from the AVR, instead, now connect the speakers directly through the output of the V3. Balance the volume using the AVR Channel Level setting and V3 power knob. During playback, use only the AVR Volume Knob as usual.
Hope this might help.
Enjoy.