Well my brother sent his Type R's back. He had paid almost $400 at circuit city. I built an enclosure approximately 2.5 cuft. Which gave each sub 1.25 to work with. They definitely sounded very good, and they were very power hungry. I had stated before that the Audiobahn Alums were louder, but I will now retract that statement. After listening to the Type R's a little longer before he sent them back, I would say the Type R's got louder, demanded more power, and were definitely cleaner sounding. We were running about 1500 wrms, approx. 750 per sub. Both were hooked up to present a 1-ohm load. The Type R's were just demanding so much power, the altenator was having trouble charging the battery. With the Alums in, there was very little drain, they sounded somewhat sloppy, but they still got loud. All in all, I was impressed by both woofers, but on a personal note, the Type R's were much better than I expected.