My new LFM-1 EX has arrived! Packaging was great - an inner carton with foam corners suspending the sub and an outer carton with cardboard reinforced corners protected the enclosure in transit. The fabric bag in which the sub is placed did a good job of protecting it while I moved it into place. The floor spikes went in easily and were a lot heavier (read: sturdier) than I expected, as were the dimpled discs to use with my hardwood floor.
I still don't have it tweaked out completely but I'm getting there. I am using test tones and sweeps (from audiocheck.net) and I noticed that the max extension mode creates far too much room resonance for my room. I've got it in a living room, not a theater room, and that means lots of things that like to shake, buzz, and rattle. Anything below 20Hz really sounds bad, to be honest. Not because of the sub but because of the room it's in. at 10-14 Hz, the drivers in my mains and center are visibly disturbed by the sub's output. They are pushed in and out... a pretty strange phenomenon to me since I've never seen it before. Kinda scary the first time you see it
. Allowing the sub to reproduce those frequencies with more power just results in more vibrations and terrible sounds. Max output mode rolls off sooner and while it doesn't completely eliminate the problem, it does help quite a bit.
The sub crawl is next, but so far I've got the gain mostly where I want it. I had to tweak the crossover settings in my AVR to get the handoff from sub to mains to sound decent. Right now I have the sub set with an upper limit of 120Hz and the mains with a lower limit of 100 Hz. Setting them both to the same point resulted in a pretty dead spot at that point. Configured this way it is a relatively seamless transition. I really wish there was a way to beef up the 20-26 Hz output but really limit anything below 20Hz... I might be able to do better once I have a more advanced AVR (hopefully soon).
I guess my question is this - is there anything else I should be doing to get this thing configured properly? I'm sure I will need to revisit everything once I have it in its optimal location, but what else can/should I do to configure my new sub by ear? Thanks!