Hi I'm justin, My ride is 07 Chevy Silverado LT 2500 HD. Just getting in to the Car audio. Just finished up building box, well I guess it's like as bazooka tube. Head unit is Alpine CDA-7876, Single subwoofer Alpine SWS- 12d4. My current amp is Alpine MRD-M500. Dont know how to set it up. Do the subwoofer specifications, and head unit specifications help set amp up. And is there a reset button, on amp. Right now I'm not getting any output out of speaker terminal. Maybe a few watts. I also have a amp getting repaired it's a Alpine V12 Expert MRV-1505 . What a monster! Don't see alot of those.