Subwoofer Question

Yeah given the space and how you have the speakers set up in that doorway so to speak, moving sub to dead center isn't really an option. Now, if you run your system with the sub off, everything is dead center perfect balance? Have you measured your system's response with the left + sub vs right + sub to see if perhaps it's a phase issue on one speaker causing a null at a certain frequency? I've seen that before where sub is perfectly set for one speaker, but absolutely detrimental to the other channel. It's maddening. I'm sure there's an acceptable setup option available. Also try pulling your sub away from the corner a pinch. If it is not only located on one side, but is corner loading that side, it'll be exasperating those heightened frequencies. But worst case scenario there's always another REL t7 on sale somewhere....... lol.

Agree strongly with the comments above (a) to check phasing and (b) that the crossover is not a cliff. Confessed as the owner of stereo T7/x's

Yes as many have shared.  I have stereo subs with my 2 main systems.  A pair of subs with a pair of speakers in 2.2 setups.  Sounds like the subs and speakers are all in one, so I can’t pick out the subs location when listening.  A second properly placed sub should solve your issue.  Good luck! 

A crosssover is not a cliff, so other fundamentals of slightly higher frequencies, lets pick 80hz  (at progressively diminishing volumes) are simultaneously originating from the sub’s location, and each fundamental brings it’s own set of harmonics, 160, 240, 320, ..... ALL lower in volume, yet ALL higher frequencies, ALL becoming progressively narrower, more directional.... 

When the ear can locate a harmonic’s location, the brain can ’find’ the origin of the fundamental.

Near crossover points, and as frequencies transcend, you can have both the sub’s cone, and the main’s woofer’s cone both making the same fundamental and series of harmonics. To retain directionality, to get the benefit of imaging, it is better to locate a stereo pair of front firing subs adjacent to the mains. I don’t llike ports, if so, also front firing to preserve/enhance imaging.

My speakers have 15" woofers with monster magnets, to both move and stop the cone (they weigh 37 lbs each) I think of them as built-in subs. People with true subs and sub arrays certainly have more lows than me, but I benefit from the bass imaging they create.

we read all the time that bass is omni-directional, but that's out in a cow pasture.

the conflict, in a listening space is, one sub, let's get the extension but not know it's location

two subs, let's get the benefit of extension AND imaging.

array, well that's for the big dogs for true extension added to large full range systems

My little 5.1 video system, I have 1 sub with a 1000 watt amp, right next to me, facing the TV, primarily to get Jurassic Park Dinosaur Stomps ...