RD Alpha V.2
Ive been through many subs, and i must say, this sub was the most pleasing to listen to. I had a 12" RD Alpha V.2 w/ flatwind coils. I was running it on my IA 20.1 for daily. I had a 2.4cft box tuned to 36hz. Its was very impressive out of my trunk. I sold it a while back and got two HDC3 10's. Between the two, I loved the sound of the alpha much more. They were similar in loudness to the ear as well(even tho the HDC3's got a little louder on the meter). If your looking for some great subs that get real loud and sound amazing off 1500-2k, id suggest the Alpha V.2 any day.