feedback from sub

If it happens when you turn the ignition off, perhaps you have the amp's power wired through the ignition?

If it happens when you turn the head unit off, then it's usually from the amp you're using. It's one of the annoyances that some amps have.

 
Do you mean to say that the amp's turn on/remote input may be tied to the ignition and not the turn on signal of the HU ?

In any event, amps do this by their nature. I'm not sure if it's due to the internally stored energy in the transformers or if it's related to the input suddenly switching (you could find out by unplugging the RCAs I guess). The amps that don't (when turning on) have what is called an "anti-thump" feature added which is active for the first few seconds after the device is powered on. The amp's still making the thump, it just does something or other to prevent any noise (signal or otherwise) from going through the subs. Sadly, there is no easy way to give a signal to your stereo that says "I'm about to turn off so please activate that anti-thump thingie" so you will hear it when things turn off.

 
do u have a stock Hu?

it used to happen everytime i turned on/off the hu. store told me its cuz i got the stock HU to run them, but dunno if true.

 
It's not the remote that matters.. it's the amp power. Did you run power from the battery, or from a switched source? If the amp isn't powered all the time it'll thump.

My USX amp thumps on turn-on. My Rockford doesn't. It's just one of those things, I guess.

 
certain amps have "quiet on/off" features...

basically, its your amp turning on before the deck... or off after the deck...

there are parts out there that will delay the signal enough to keep this from hapenning...

 
Lol, that'd be funny as hell if someone wired their sub amp up to only a switched power source in the car, particularly when the battery is that much more attractive an attachment point.

 
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