I may have missed a couple posts so sorry if I repeat something that's been said or you tried. I think you may be having an integration problem. However there's definitely an issue, those subs will give some serious output. BTW is your room open and how high are the ceilings? I didn't see your crossover setting, which may help, and I didn't see which version of audyssey you have (XT, XT32, other). Does it have SubEQHT? How are you hooking up three subs? I assume a Y connector or two?
Some points on my thoughts
- You said the sub crawl sounded the same "all over the seating position"...hmmm does not compute. When you do a sub crawl put a sub at your MLP, play the AVR test tone, and you crawl around the room with the SPL around the woofer height taking note of SPL at various location where the subs can be placed. The SPL's will move around and you need three good spots.
-You could be having phase issues, that's not easy to correct simply with the phase nobs. You also mentioned the "average distance". thus I take it to mean they are different distances and I don't think you have 3 independent distance settings. If you were in an anechoic chamber with two subs putting out equal energy perfectly out of phase, you would hear nothing.
-To get phase right for multiple subs you set audyssey distance to the furthest sub, then you introduce delay to the closer subs.
-Check out gain matching, search for a post by craig john
-Multiple subs are not easy to integrate do some research
-REW and measurement gear is one of the best investments you can make in your system. Omnimic's a good alternative.
-Any way you can get the subs equidistant to main listening position (MLP)?
-Find and download test toes which include sine waves at particular frequencies, I'm going to recommend 80Hz for your crossover so you need that one.
-trying different positions will have a big impact, hard to rate them though without measurement gear
Quick start recommendations - start simple
-first unhook all the subs except furthest, play the AVR test tone and set the sub gain higher then 75db with the SPL meter nearfiled, say 82db when measured about 3 in from the woofer with woofer in center of room.
-set the gain on all the subs to that same gain value (really you should gain match them all but this is a close approx)
-Put the sub in the furthest location resting spot., still only that one hooked up, run audyssey minimal run, note the distance and sub trim setting. The AVR just got the distance(meaning phase) pretty good for that one sub
-Change the crossover on the AVR to 80Hz (which on non onkyo avr's means you have to set speaker to small, just terminology difference), keep sub crossover all the way up, phase 0
-play some stuff, how does it sound, audyssey level matched for you with the mains and it is in phase, should sound pretty good
-try to get sub 2 equidistant to sub one, if you can, Y splitter hookup, phase nob 0 on sub, Y split, hook it up.
-rerun audyssey minimal run, distance should not change and if so not much, sub trim should be lower, 3-6 db lower
-Change the crossover on the AVR to 80Hz, keep sub crossover all the way up, phase 0
-If you can get all 3 equidistant repeat sub 2 steps for sub three, last audyssey run do full run, don't move the mic all over the place, keep within a couple feet of MLP always at ear height unless you have high back couch then a little higher.
I assume you can't get all three equidistant so
-after one hooked up and playing nice, or two if they are equidistant (and crossover on AVR 80Hz)
-you get the furthest sub right, then next closest and run these procedures, then repeat for closest
-hookup additional sub
-play sine wave at the crossover frequency (80 Hz) and adjust phase/distance (Im assuming you have no independent distance setting so you will use phase nob on sub)
-with SPL meter in C-weighted slow mode, put that at MLP ear height and tweak phase until meter gives highest SPL value, a helper is good here obviously
-rerun audyssey, how far off is distance from original distance? I think I'd put it back to original distance but experiment with that.
If you ever need to adjust gain on the sub to get AVR sub trim reasonable, adjust it on all sub equally, you want them putting out equal energy and working equally as hard, and getting to their limits at the same time.
All this is much easier with measurement gear
This post is so sloppy, sorry, I'm hurrying got to get to work. I'll check back in tonight.
Patience, you have fabulous gear. It'll sound great once it is all integrated nicely.