Is this normal

 

Bronze Member
Username: Jryan781

Post Number: 15
Registered: Nov-05
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?
 

Gold Member
Username: B101

Queen City, NC USA

Post Number: 2491
Registered: Sep-05
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.
 

Bronze Member
Username: Jryan781

Post Number: 16
Registered: Nov-05
its a Pyramid PB1281X
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