well, i got my system finished and working. it always worked great... but now there are issues. when the engine is running, there is intereference from the ignition, and it plays through the damn subs. volume, and sub level have no bearing on the sound, it's always there. i'm thinking that one of two things has happened. #1. either my ground was never great in the first place... and it's juss now showing. or #2... it's fine, but loose @ the amp. what do ya'll think?the amp is under my trunk floor... so i haven't had a chance to check it yet. any input will most likely be helpful. thanks guys