I have thought about splicing speaker wire together in a Y configuration, then one set to the sub and one set to the speakers, but was hoping there was something that would have internal crossover. Not a big deal one way or the other as I can still use the sub’s crossover.

Rick, how’s that work using the 1070’s second pre-outs? Would I just use a stereo to mono Y adapter of sorts? My sub just has the one coax input. That would be a bit more elegant than splicing speaker wire.