Thump from speakers when car turned off
Posted: Tue Mar 24, 2009 2:10 pm
Okay, so the new system is installed.
Meanwhile, everytime the headunit has power turned off, the speakers make a loud thump.
Depending on how long the powers been on, means the thump is even bigger.
I was informed it could be that the amp needs to be powered down first, before the headunit.
So I installed a switch off the remote wire, and then tried turning off the amp whilst the headunit was outputting.
Still thumps.
Was told to try and pull out the RCA leads whilst there was still throughput.
I THINK this worked, but was hard to tell, as I was leaning into the boot, so couldn't hear.
I have installed a filter cap inline with the amp, it is about 50cm before the amps positive cable.
I'm out of ideas.
Last thing I can think is a smaller filter cap on the headunit power, and see if that works...
It's becoming annoying.
Meanwhile, everytime the headunit has power turned off, the speakers make a loud thump.
Depending on how long the powers been on, means the thump is even bigger.
I was informed it could be that the amp needs to be powered down first, before the headunit.
So I installed a switch off the remote wire, and then tried turning off the amp whilst the headunit was outputting.
Still thumps.
Was told to try and pull out the RCA leads whilst there was still throughput.
I THINK this worked, but was hard to tell, as I was leaning into the boot, so couldn't hear.
I have installed a filter cap inline with the amp, it is about 50cm before the amps positive cable.
I'm out of ideas.
Last thing I can think is a smaller filter cap on the headunit power, and see if that works...
It's becoming annoying.