odd noise when starting vehicle?

so i got my stuff all set up.. but when i start up my car.. and wait a little bit.. like right before the cd player is about to start playing the cd.. it makes a weird noise threw the subs.. like its bass but idk wth it is.. it only does it for a second than once the cd plays it goes normal? what would cause this to happen.. and its only happening to the subs.. doesnt make any odd noises threw the speakers.. and it only does it right after i start up my car.. it might do it if i change a cd too tho, i didnt try yet.. just got done hooking everything up.. but it didnt do it when i jsut turned the key on and didnt start the car so idk .. very odd

you mite want to check all ur grounds u dont want it grounding any were its not soposto if its not that eather ur deck is bad or the amp... is it all new or used ?! 

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mannie

Sounds like a turn on issue with the sub amp.

is it like a big thump or like a wind

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mannie

i think its the radio .. i can hear the radio in the background.. i think it just doesnt know what to do and it sounds distorted .. is there any way i can unhook my radio so there is no static noise coming from the radio? or would it be a bad ground?

oh yeah and everything is brand new