I just installed 2 Alpine type E subs in a sealed enclosure and a MTX 4250D amp. Did have just 1 12 MTX sub with a MTX 4202amp, then upgraded to this for less than 200 more. It is such an improvement. Blew my MTX in 2 days, so hope these alpines last longer. I still need to dynamat the trunk and stop the spoiler rattling though. Tell me what you guys think.