After playing around with the 1X12 this weekend, I've kind of got a handle on how it performs. As far as ID 12" home theater subs go, this isn't one of the better ones. Seems a little lacking in extension and it will make some port noise on demanding scenes like the WWZ grenade scene and the giant Lycan scene from Underworld Awakening. From a home theater standpoint, I would take the RBH I-12/e over the 1X12. SVS PB-2000 is another I would go with and even the PB12-NSD. The Monolith THX Ultra 12 is like in a whole other league compared to the 1X12. I didn't really buy the 1X12 for home theater, but if that had been my primary usage, I would be a bit let down. For music I think it's a nice sub and on the smaller side compared to all those I previously mentioned. For music only use, the Monolith THX Select 10 is on sale for $400 every so often and I would save $200 and go with it over the 1X12.
Subs>RBH I-12e/I-12. HSU VTF-15H mk2. Monolith THX 12(x2)/THX 10(x2). XTZ 1X12. SVS PB-1000(x2). Speakers>JBL 270/235c/230/225c, Arena 130/125c. Jamo S807/S803. Infinity P363/163. Sony CS3/CS8/CS5. QA 3020i/3090Ci, 2020i/2000c. Monolith Cinema 5 bs. Polk RTiA1/CsiA4. Other Audio>Sony MDR-Z7m2, WH-XB700, XB32, XB31. Sennheiser HD58X, HD4.50, PC37X. SIVGA SV004. HyperX Cloud PS4 HS. Plantronics RIG500 Pro HS. LG FH6,RK8,RK7,PK5. UE Boom3.