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i just installed a pioneer mono amp 360 RMS with 2 12" subs at 150 RMS each, and at first they sounded ok, but the next day, the subs would make a weird "thump" sound each time i change the track on a cd or a new radio station. any1 know what the problem could be??

 
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is it every time, or just some times?

 
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im guessing you have an outdated or old head unit...alot of the older ones do that.. so i would look into a new one if it is old.

 
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could be a grounding issue also

 
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check the connections to your radio. It sounds like a grounding problem

 
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actually i got a clarion head unit to go with it, but yeah , my ground wire from my amp to the back might be wrong i don't know, because i bolted it to a screw on the underside of the rear deck , which i ain't sure is metal because it doesn't feel like it...

 
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and yes it happens every time i change the track or a station

 
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yeah, find some bare metal on the chassis and bolt the amp ground to that. take some sandpaper and sand off a small patch of paint if needed. just make sure you get bare metal.

 
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Yes its a grounding problem, i think also i used to put stereos in cars as a job and know alot about that issue but also check the ground to the amp as well

 
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true very important to make sure its bare metal

 
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does you amp shut off between tracks.. bc i kow if u have ur stereo cranked and u turn on ur cna thats the sound ur amp makes when it turns on.. could be a loose remote wire

 
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own a dremel? use the wire coil or i forget what its called but in the trunk like the bar behind the back seat just dremel a small part of paint away from there, and then drill and ground. thats what i did.. all better. or just find another location.. CAREFUL: Sparks fly

 
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yeah , it probably is the ground wire from the amp, i grounded the ground wire to the under part of the rear deck which is probably like some sort of plastic , not metal, but yeah thanks for all the help guys =]