Finsup: I have a 7.4 HT system with all 100-S3 drivers. I use Yamaha's YPAO (RX-V763 with external amps), and it works fine. I also have a 2.1 system with 2XO's; an older HTR-5990's YPAO (no amps) works OK there as well.
Rbf1138: In my 7.4 system I have four Epik Empires, with the Empires EQ'd using an SVS AS-EQ1, x-overed at 80Hz. My 2.1 system uses an older ACI Titan XL with no EQ on the sub, x-overed at 80Hz. I also have a 4.1 system with two Microwalsh Short omnis for the mains. The sub is a Paradigm Ultracube 10, EQ'd with an Anti-Mode 8033, x-overed at 100Hz. All the subs work fine with the Ohms. I also have used the inexpensive Behringer 1124 Feedback Destroyer as a sub EQ and gotten good integration with the Ohms.
Rbf1138: In my 7.4 system I have four Epik Empires, with the Empires EQ'd using an SVS AS-EQ1, x-overed at 80Hz. My 2.1 system uses an older ACI Titan XL with no EQ on the sub, x-overed at 80Hz. I also have a 4.1 system with two Microwalsh Short omnis for the mains. The sub is a Paradigm Ultracube 10, EQ'd with an Anti-Mode 8033, x-overed at 100Hz. All the subs work fine with the Ohms. I also have used the inexpensive Behringer 1124 Feedback Destroyer as a sub EQ and gotten good integration with the Ohms.