The sub's crossover would be used and set at 60hz. The amp I use is a 2 channel integrated amp (arcam a19) with stereo pre-outs that will provide line level rca output to the sub.

Does anyone know if any of the newer planned subs have stereo rca input for a summed output for use of both stereo channels?

It seems the current subs are meant for LFE channel use only. That is fine for HT. Not so much for music. Can an RCA Female to Male Y cable be used for this situation?