So in summary: dividing is OK, summing is bad.

Dividing: One output driving two amps. (One sub-out to two subs.)
Summing: Two outputs being combined into one amp. (L&R outs into a mono amp.)


Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris