In early Summer I completed work on a 214L vented Tempest (I JUST LOVE IT!) and just recently I finished my LCC. I was wondering how long it takes for the break in. I've got about 25 hours on it so far using various material from Jazz to Classical to several movies (LOTR/FOTR, LOTR/TT, Road To Perdition, Star Wars-AOTC, Shawshank Redemption, Titan AE, Planet Of The Apes, etc). It seems to exibit a lot of presence in the mid to treble region with the Audax tweeter and AV8 in comparison to my old el-cheapo MCM center channel. The LCC is DEFINITELY A LOT MORE EFFICIENT to the extent that I had to a adjust the equlaizer on my Sony A/V receiver to tame that a bit to mate it with my JBL mains. It seems to be a very accurate producer of whatever program material you throw at it and it produces some good bass (I presume that it will get better given time). My basement theater is 14x19x17.5. The LCC presently is on a flexy shelf above my Mits RPTV and my seating position is at about 10 feet. I was wondering if anyone else who has built the LCC has had the same experiences with the mid and tweeter during break in? Is there a way to tame some of the presence it exibits or is it just that I'm "not used to" the sonic character of the LCC? Does anyone know what is the efficiency rating of the LCC? Let me know what you think about this and thanks for your input. P.S. The only mod's I did to the LCC was to swap out the Sandcast resistors with precision Mills resistors and the cabinet has a 1/12 inch thick front baffle. I also made sure that I had properly connected the AV8.