This is very true in regards to room making ALL the difference. I do agree with you on the SVS being tied and true and proven to be as flat as they come!
points of contention however:
1)Ain't no roll off at 30hz on those Jamos' Here are some FR graphs taken in my room with Luke Kamp's ominmike.http://www.avsforum.com/avs-vb/showt...1#post20212041
The Jamo's were THX Ultra II certified subs which at least means extension to 20hz with +/- 6dB Notice they look very flat up to the null in my room at 50hz and down below 20hz.
2) My room doesn't give gain, at least not traditional levels of room gain. When luke has had his omnimic over on several occasion and during the meet it was recognized that placement didn't matter as much as it likely should have. The guys who were attending with the measuring equipment, Luke, and counsil will confirm.
BTW, the Jamos were lined up along the front wall for those tests, probably about 1/3 in on each side (though not exactly because my room isn't perfectly square - one side is elongated before a big stone fireplace). When we tried the corner's one time or another the measurements weren't any better, so we moved them back more to the center.
I do not have measuring equipment so I do not know what the SVS are currently doing in comparison to the graphs I luke made for the Jamo setup. The SVS DEFIANTLY feel like they have a lot more to offer down low in the ULF range - so based on that!!! it could be exactly as you say that they are offering so much down low that they aren't configured correctly to make it feel flat and balanced in the mid bass frequencies. I'd be interested to see some graphs myself, but don't have the equipment yet and am pretty much spending myself into the doghouse lately on subwoofers so I don't have plans to buy the equipment in the short term. Yes -- I'll pre-emptively admit I'll likely be told I'm doing this wrong. Buy measuring equipment first and quit buying subwoofers until you get measuring equipment and figure out what the problem is! JUST keep in mind that luke's omnimic has been in my house on a couple occassions and counsil's measurement gear has been there too (though counsil's just for the meet). There wasn't seemingly a whole lot that could be done with my room without dropping in some new walls! SOOO then perhaps I'm just on a quest to buy subs that best match my cruddy room!?!? I supposed tonight I'll turn on the room compensation on the SVS which should drop off the lowest frequencies, and then put it in a 20hz tune and crank up the gain a bit more and see if I like that sound better - Generally speaking that should meet your recommendation....
I've moved those SVS all over my front wall in testing different locations. The corners is where they are now because it gives me a smidgeon more of the crazy low ULF for movie watching, but no matter where I put them I've not enjoyed them as much for music overall as I did the Jamo pair. It could even be reference vs. preference for sound --- but then as judging by the Jamo FR graphs linked above - the Jamo's were pretty darn flat to reference. And you guys know I LOVE the low stuff boosted (if you've read enough of my posts to know anything about me!!!) -- that was my sole complaint about the Jamo's is they didn't have enough guts down real low -- no ability to force a smile!!!! So if the SVS are delivering more there (and I know they are!!! --- WOTW sounds awesome on the SVS!) I should be pleased as peach, but for some reason I'm not.