In a '13 Mazda 2:
I have one of these in a custom spare tire well fiberglass enclosure connected to a bridged pair of outputs of a SoundStorm AE424 amp, supposed to be 1200 watts peak @ 4ohms, ran off a Pioneer AVH-P8400BH.
I am running 2 pairs of JL Audio C2-650x (a paired series into 8ohms) a pair of JL Audio C2-075CT (parallel with the series 6.5's) and finally a pair of JL Audio 8W3v3-4 (at series 8ohms). There are 2 SoundStorm AE424 in the system.
Really very loud overall and I need sound dampning.
The sub is loud and clean. It plays really low. JL makes fine speakers and subs. Audio C2-075CTL Audio C2-075CT