Question about Solid Audio F15D 1-Channel Amplifier Car Audio Amplifier

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When i turn on and off my car my subwoofers make a thumping noise

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Turn the headunit off before you switch the car off

Posted on May 05, 2010

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Posted on Jan 02, 2017

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1 Answer

I have subwoofers hooked up and when i hit my brakes it thumps and when i hit the window button it will thump when i hit a bump it will thump what could this be


Interference in the electrical section,try putting a noise filter on your system that should help!!! also make sure all your equipment is grounded properly.

Sep 21, 2009 | Car Audio & Video

1 Answer

I have a 2000 Z3 and there is a thump that comes from the speaker


Check to see if at the amp there is a strand of wire crossing over. i had a friend onetime who had the same problem and they just didn't twist the wire all the way before connecting it.

Aug 20, 2009 | Car Audio & Video

1 Answer

P110 thump,twich when volume off


that is normal. Just because they get such a boost when amp is first turned on. You can always turn off high pass and turn gain down just a tick

Jul 09, 2009 | Rockford Fosgate Punch Stage P110 S4 Car...

1 Answer

Only one thump when car is turned on. problem in amp strength or subwoofer?


try pluging in a diff, speaker to the amp see if u get sound.try powering the sub with a home radio just to see if u get sound at all if ur getting sound from the sub then its the amp but u could of damaged it when the amp over heated

May 03, 2009 | Kicker SoloX S10X2 Car Subwoofer

1 Answer

Loud thumping noise


ok u hava pero in solb u us mlifayr
vich wat ok and 2 chanl 4 chanl 8 chanl 16 chnal us platal mi

Mar 06, 2009 | AudioBahn AK402 Car Speaker

1 Answer

JBL PB10 subwoofer, it makes a loud burp noise when it comes on.


In the industry - It is called "Turn-On Thump".

There are some manufacturers that eliminate components like noise filters on enry level lines to save money.

There is no way to lessen this noise without ripping the amplifier apart and having a technical knowledge of the way amplifiers work. It would involve hard-wiring a slow charge capacitor in the turn on line so it gradually builds power instead of getting it all at once.

Thanks for using FixYa - a FixYa rating is appreciated!!

Feb 10, 2009 | JBL PB10 Subwoofer

1 Answer

Thump at the time of shutoff


The amplifier in the sub as with any other amplifier has a capacitor in it. Essentially a battery that holds a charge. When you trun things off such as subs or amps with a powerstrip instead of the intended on off button, the power supply has been cut, but the capacitor is still energizing the unit. So it catches the noise in the line.

Mar 07, 2008 | JBL PB10 Subwoofer

2 Answers

Thumping Subwoofer


Ive seen this problem in alot of audio setups in vehicles but most peeps dont know this is not a good thing and will cause damage to your woofers or amp. 99% of the time it turns out to be as you said that bad boy muting circuit. alot of these curcuits do use separate transitors or diodes as mute switches but most of them are directly from the Microproccessor. Only way to trouble shoot this is with a schematic and a good car stereo tech. Good luck

May 25, 2006 | Yamaha RX-V2200 Receiver

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