A couple of things to consider...

1) What are your crossover settings? I have my mains crossed over at 60Hz and on music listening there are many discs that never produce anything at or below that crossover point. I'd make sure that the LFM-1 is actually being asked to work.

2) As a parallel to this comment, I'd set the sub up using some bass-involved material that you are familiar with. The LFM-1 blended better in my system than my previous sub, which will likely make moderate level bass or bass near the crossover point difficult to identify as coming from the sub (which is of course a good thing). Feed it some deep bass that you know (the SVS FAQ's have a good list of examples) and see if you get some bone-jarring, window-rattling, housepet-terrifying rumble. If the LFM-1 is still holding back, I'd suspect that your carpet is acting as a muffler and a few blocks or a board under the LFM-1 to get it up a bit higher might give it the room to breath.

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