Originally Posted by AustinJerry
On Page 19 of the MiniDSP 2x4 setup guide, there is a picture showing two speakers (subs) with reversed polarity. Basically, you measure each speaker, open the Overlays screen, and select Impulse. The leading edge of each speaker's impulse either rises or falls. All speakers should match, i.e. all should rise, or all should fall. If not, then the speaker that doesn't match has reversed polarity.
Ah, I didn't notice that in MiniDSP guide as I'd skipped the subs bit. I had a quick look last night but didn't get to do much as I wasted a lot of time being confused about only being able to choose L/R on the output which turned out to be a very rookie mistake (the AV Matrix was set to force 2.0 EDID).
I couldn't figure out why the timing reference started appearing as a 'click' instead of the high pitched noise (no matter which speaker I put it through) which REW then couldn't find. I'll try on my other system tonight, but I may have set something up wrong somewhere - its not the speakers as the sweep goes through fine, so I guess I've managed to accidentally set something in REW which has broken it.
The plots I got were easy to see polarity on subs, but on other full-range speakers was very tough so I guess I need to remeasure with a limited range.
Also, on the HDMI output I got the option of the 7.1 speakers but not for any of the Atmos ones. I couldn't find anything about Atmos in the guide - can REW send signals to the full 7.4.1 Atmos speakers?
TBH, I got fed up after so much time messing about and with my own stupidity and ended up putting on Fury Road to see how it sounded on the opening scene and 2 hours later the credits rolled