Infinity Kappa Perfect 12.1D
- Box - 1 cuft per sub sealed (I had two of them), powered by a JBL 600.1. This was my first "real" setup, where I decided to spend some actual money on car audio. Overall, I was somewhat disappointed with them. SQ wise, they were very good, and took anything I thew at them. However, the SPL was
severely lacking. They simply didn't get all that loud. So I borrowed a friends amp (USX 1000d that did 700 @ 2 ohms) to see if it made a difference and the subs blew.

I wouldn't recommend them unless you can get them very cheap.
Resonant Engineering 15" XXX
- Box - 4.32 cuft after all displacement, tuned to 29hz. In the trunk of my '89 Olds Cutlass Ciera, powered by a Hifonics BX1500D. Overall, I'm thoroughly impressed with this sub. The first thing that impressed was how lowwwwwwwwwwww it can get, and the ability to not miss a beat. It handled a 10hz-80hz sweep with ease. SPL wise, it's loud. I can't exactly convey how loud it is in words, but my rearview mirror did rattle off. SQ wise, it gets the job done. I'm not going to say it's a flawless SQ driver or anything of the sort, as it's not. It lacks a certain, for lack of a better word, crispness on certain songs. But in the same vein, if I wanted that crispness, I would have bought a different sub. I was looking for an SQL driver (with a healthier dose of SPL

), and this sub delivered everything I wanted.
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