I run two Kicker L7 15's and they get loud. You're not going to get a lot of kicker support on this site since this is afterall a rockford, FI and DC site. All are good brands...it really comes down to how you build your box and the build. I wouldn't say T1s hands down. I have heard both and they both get loud and sound good depending on the box and the install. And for the record I like the look of the new L7s way better than the T1s.