Since you're using two amplifier channels for each speaker, the
"Y"
rca interconnect
cables
are used to connect the MX-136 L and R output to amplifier's inputs.
BTW, if you want to use MC58 for HF speaker ports and MC7205 for LF ports, it's horizontal bi-amping.
BTW, if you want to use MC58 for HF speaker ports and MC7205 for LF ports, it's horizontal bi-amping.