Summary: Unbelievable sub. I have had crazy systems in the past. This sub paired with the alpine 6x8 two ways in four doors and alpine tweeters in the front. All run off the alpine 5 channel v9. I had a custom down firing box built for it that fits UNDER half of my back seat. Wasn't really expecting a lot. Very pleasantly surprised. Super clean and very loud. Most people cant believe there is only 1 sub. Let alone a shallow. Then again it's all alpine.
Summary: I have a 2012 Chevy Malibu and had an Alpine SWR-12D4 in a full size sealed box that took up half my trunk space. We've had a new addition to our family and soon realized the box and the baby stuff was not all going to fit. I needed something smaller but still wanted some thump. After reading alot of posts/reviews about shallow mount subs, most spoke negatively and said that they didnt pack the same punch as a full size sub.
Summary: Well I can't say its the company fault but I got a swr-t12 with a cracked magnet / heat sink. So I took pictures never plugged it in and I got to wait a ~2 weeks for it to clear up and got another one. It sounded mediocre (in sealed box of ~0.8cu ft) Powered by a moderate Alpine PDX-M6. Well I set the subsonic to 30hz (very safe). Low pass at 80hz. had head unit volume half way. Gain set 3/4. I pluged in a 33hz test tone and sounded cool.
Summary: I would not even compare this to a standard type r. I bought this for truck. It lasted maybe two months. After it blew on the song Late Night Tip, the speaker was dented. Looked like someone had punched it in. For what this cost on amazon at the discounted price, I should have bought two Sundown Audio SD subwoofers. Probably would even have $ left over. I guess if you listen to soft music this sub is good. But terrible for hip hop rap dance and so on.
Summary: Very impressive shallow mount subwoofer. I am NOT a fan of alpine subs normally. This driver is however a cut above the other subs Alpine offers. It is very clean and accurate. It also has very good output. I had a 12 " Rockford p3s in my last truck in a factory spec ported box running off of Rockford power 800.2 bridged. It was great for a shallow sub. Just for fun I tried one of these in the same box and was blown away.
Summary: For a thin single 12 inch sub I'm extremely happy with the performance. I installed it behind the seat of a crew cab F350 in a custom made box. I matched it with an Alpine PDX-5 amp on the sub channel, it has plenty of power!
Summary: I installed one of these in a .65 cubic ft. space saver box under the seat in my 2011 Silverado. Sound is great solid drum and bass notes. I have it hooked up to a Kenwood excelon 900-5 amp pushing about 400 RMS to the sub. Couldn't be more pleased. Worth the money only 12" sub that will handle .45-.75 cubic ft. of air space.