power surge to sub on start up???

[jdSVT]

this is on my 07 Audi S4. just put a 12" sub in witht he factory system, but everytime i start the car the sub goes full power for like 3 seconds and rumbles like crazy, i have no idea what it is ive never heard of anything like it. the sub is hooked up with the remote wire, 2 audio cables power through a rockford fosgate circuit breaker then to the battery and a solid ground, it only does it on startup? any help would be mich appreciated

[majorleaguebass]

I had a bad rca do that to me and also a messed up h/u

[lrstrck]

your RCA jacks are touching metal or your ground is shorting out ...check all wiring and make sure all is secure and tucked back out of way...

[jdSVT]

lol i feel like an idiot, RCA jacks are the 2 audio wires running from the amp to the heaD UNIT

[majorleaguebass]

No headunit to amp