If you have Bose 901's, then you have to use the Bose equalizer with them. However, the Ed would not be right for the CV's, as it would overamplify the lows and highs.
Using the R-S700 to power the CV's, and then put the Bose EQ inline between the pre-outs of the R-S700 and the inputs of the MX-600u and use it to power the 901's. That way, only the Bose get the EQ, and each pair has its own amplifier.