Hi, I am from india and i am keen to order the FI subs for my car after seeing so many satisfied customers and so many videos of good things about them. I want to install them in Chevrolet optra (4 door) aka Lacetti in USA....My current setup has HU--Alpine 9887 Compos :-- rainbow SLC 265.65 NG Amp for Compos : -Audison Srx 4 Sub :- Alpine Type-R 1222d (12") 2no.s in a sealed box 1.35 cu. feet for each Mono amp :- Alpine MRD M1000 Power acoustik 3.0 F capacitor Audison and Directed Audio RCA, power cables, Audison ground and distribution block I have touched 140 DB on the windscreen easily in my sedan with this setup now its time to upgrade wherein i have multiple choices.... I can stay with the 1000W rMS power of my amp and get a sub according to the ratings of 1000W RMS or i can but 1 more amp with similar specifications or may be similar one to push them to get 2000W RMS. I wanna touch atleast 145 DB with teh sealed enclosure coz somehow i dont like the boomy sound of ported enclosure and i want the sub to go really low....SO its the low bass which i prefer.....I can go with any size be it 2x12" , or 1x15", 2x15" or even 1x18" provided i have enough space for the enclosure to get inside my boot......So i m now really confused in between Q ,BL and BTL series sub....as i am in india and i cannot audition them by any means possible...so you guys will be only medium for me to get that detail so that i can order them accordingly....Price is not an issue as they are great VFM......but i want a setup which can be used on daily basis as well becomes stealth and push out great SPL when required... Please suggest guys....that would be of great help