Well, this has been educational. In my defense, I always tell people that 2 channel music is by far my #1 priority in my good system. I didn't know the nuances of dipole surround speakers.
So, thanks to Ron for asking the questions and Gregg for answering, and most of all, explaining the answers.
I first added side dipole surrounds (Polk LS F/X) 19-20 years ago. Switchable di/bipole speakers were a fairly new thing and I don't think many people really understood them. It would have been fine, except the LS F/X can be mounted upside down if needed, which is what I did. They've been like that ever since. Problem is, the left and right speakers need to be swapped when you do that and run them dipole. Never occurred to me until today. Now that's fixed.
A few years ago I expanded to 7.1 and added Emotiva ERD-1s in the back. They aren't manufactured as left or right, but can be electronically set as bipole, inverted bipole, left dipole or right dipole. Of course, I tried them as dipole with the left set as left and right set as right. It didn't sound good, so I settled for setting both to bipole. Now, with the flip of a few switches, that's fixed. The left one is set as right dipole and the right is set as left dipole.
Yeah, it sounds better. Distinct placement of surround sounds actually exists, where it didn't used to all that much. I need to re-equalize the surrounds and recalibrate them. I did a quick adjustment with the internal level generator on my Sherbourn PT-7030 and an SPL meter, and some quick EQ adjustments by ear. I don't like auto calibration. There's no point in telling me I'm wrong. It's just the way I like it.
So, thanks again.
The Hybrid System
The Music Part: Emotiva XSP-1, Thiel CS 3.6, Emotiva XPA-2, Marantz SA8004, Emotiva ERC-3, SVS PB-12 Plus 2
The Surround Part: Sherbourn PT-7030, Thiel SCS3, Emotiva XPA-5, Polk & Emotiva Surrounds.