If I turn my key just enough to turn on my stereo and other accessories like fans and stuff everything works fine. But while im listening to the music, if I start the car I hear a "thump thump" from my subs as the engine starts. After the engine starts the system works like normal just like it did before the engine started. If I start the car without listening to the stereo first I dont hear the "thump thump". I'm just wondering what causes that "thump thump" when I turn on the car....is it normal for that to happen or is something wrong?
its normal depending your amplifer. what kind of amplifier is it? my prd1000.1 used to make that thump when u turned it off with the key. my orions however dont make it at all!
the thump what u hear is the extra voltage draining off the voltage rails of the amplifier to the speaker output.. Good amplifiers will have a filter to discharge the caps.