Summary: Great product overall. I had mine in a poor box however and the surround came off of the cone.. But i got it fixed and got a new box and now it just completely blows me away. This thing is a monster!
Pros: Nice deep bass, Loud, And just about everything else.
Summary: I bought this to replace a much more expensive subwoofer that failed due to a broken dust cap. I had intended for it to be a temporary solution until I could have my other woofer repaired. Once I heard this in action, I decided not to even bother with swapping it back out. Since this subwoofer has two 2-Ohm voice coils, it can be wired to run in 1-Ohm mode or 4-Ohm mode. This can be confusing if you're not familiar with subwoofer wiring.
Summary: Two of these bridged down to a 2 ohm Load + 1 Alpine MRX-110 = One ridiculous system. I put two of these plus 1 Alpine 1100w amp in my 01 Mustang GT and they far exceeded my expectations. I cannot even tell you how loud they are. I can also tell you if you add another amp so each subwoofer is getting 1100w, well... I have never heard anyone's Kickers, Rockford, ect as loud as these.
Summary: this subwoofer not only sounds great but you cant beat the price. I have a jl w7 set up on my other vehicle and this Alpine subwoofer is up there with it. I am extremely happy with its performance.
Summary: I haven't messed with mobile audio in some time and found this subwoofer light years ahead in terms of build quality and power handling to what I've owned in the past. It's heavy and and almost too beautiful to be enclosed in a speaker box. I'm running a Rockford Fosgate M750-1D rated at 900wrms in a ported box and it's more than enough on the beach from over a hundred feet away with the gain turned way down. This speaker has inspired me to build a system for my truck.
Summary: This is an excellent speaker and I have tried many over the years. Infinity, pioneer, rockford fosgate, kicker. This rules them all! Nice tight bass and can handle massive amounts of wattage. Never distorts...ever. FYI - it is very deep and very heavy and requires a pretty big box. Do your research, get some high watts flowing, a nice pre-amp, and a decent box and you will fall in love.
Summary: Is my third type R alpine sub, firts the swr-1242d, then swr-1243d and now this D2, i recommned use it in a ported box, it works great from 300 RMS if you want more you can go to 1000 RMS, nice build, good materials and quality, flexible connections two voice coils at 1OHM or 4OHM or even 1 single voice coil at 2 OHM, 24 pounds of power, great deal.