Where do I start?... Well, I was looking for an all around awesome subwoofer. I wanted something that would sound pretty good, get low and be able to peel someones face off if commanded to. I had already been amazed by all the videos I had seen (especially Steve Meade's) and was looking at the different lines that were offered. I was looking more and more at the Q and BTL. I liked the looks of the Q along with the price but was abit unsure of how loud it would be in the end. The BTL was thought to be a better option considering several people said the sound quality from them was better than expected but I couldnt really see paying $100 more for a subwoofer that would probably be better in someones burp car with 4000+ watts. I really just wanted something kinda in the middle of these two. Anyway, while waiting on my income tax return I hear some good news, they have decided to add a subwoofer to their line. Right in the middle of the two I had a hard time deciding on. By this time I decided, that whatever I chose, I would get it in an 18". They just look cool and I knew the performance from Fi would be great. With all this excitement of the new line and saving some money over the BTL I decided why stop with just one... I ordered two 18" BLs with full cooling and flatwind voice coils. I have decent wood skills but im not too great at designing boxes so I got some help from Pete at Team Toxic Bass with a design. Here is a couple pics of the guts of the box. All together. Sanded. Then routered a few edges. Done and covered in dark gray vinyl. I have owned or experimented with or just listened to alot of varieties of stereos. Boston Acoustics G5s, Alpine Type-Rs, Sony Xplodes, Soundstream subs, Kicker subs, Crossfire BMF, Crossfire XT2, Digital Designs 3515, RE SX, I had 3 sealed L7s, a friend has 8 sealed Soundstream Van Goghs and 3000+ watts. Theres more, but who cares, I have loved loud stereos in houses and in cars for 10+ years. Got the BLs, put them in the box, hooked them up to a Concept CD-2410 at 1 ohm, OMFG... They are beasts, they do whatever you tell them to do. I am already on a mission to see what they can do with some real watts, more current, and a louder box. I never would have thought Metallica would sound this good on an 18", 5 years ago. I heard someone say not long ago that they used to have certain songs they would show their system off with but it is unnescessary now because everything sounds good. Well, I cant remember who said that, but I totally agree with him. Everything from Godsmack to Skynyrd to Young Jeezy to everything on the radio sounds good. And if I tell them to get loud, they do it. I could also see these subwoofers doing very well in an SPL car. There is a nice little range of frequencies that almost hurt. A couple pics of them installed. Below the window line. Nice... I will make another review or two. Still trying to think of Good, Bad and Uglies. I want to get more juice and maybe change up my box before I lay down any bad and uglies that may be found. I want to try one or both sealed down the road, also... Thanks, everyone at Fi Car Audio.