Coe -- I have a feeling the Accuphase offers more of an equaliser functionality rather than a "xover" one (as in the dexq or the Behringer).
Controlling volume is indeed a tricky issue. In my case, we fed an analogue signal to the dexq via a passive control... I suppose what you'd like, ideally, is to feed the digital signal direct from a transport to the deqx dsp xover function: the dsp would then split frequencies, convert to analogue and send to output from where you then feed the amps.
But why not use the deqx's attenuator??
Controlling volume is indeed a tricky issue. In my case, we fed an analogue signal to the dexq via a passive control... I suppose what you'd like, ideally, is to feed the digital signal direct from a transport to the deqx dsp xover function: the dsp would then split frequencies, convert to analogue and send to output from where you then feed the amps.
But why not use the deqx's attenuator??

