Can an XLR left channel signal be split to L/R inputs of a subwoofer and then combined out of the L/R outputs of that subwoofer to connect to an amplifier being used as a monoblock? (Similarly for the XLR right channel signal). Or is it better to connect a single XLR cable to the left input of the subwoofer and another XLR cable from the left output of that subwoofer to the amplifier? (Similarly for the right channel). This is for a dual subwoofer setup.