Hey guys,

I currently have a problem with my subwoofers and amp. For some apparent reason, when i turn on my car and deck the subwoofers automatically start vibrating continuously. I can obviously play music while this is happening, but have no idea how to stop this noise. I would drive for approx. 25-30 mins, with the deck off, and all of a sudden the vibration stops. Just to note, this only happens the first time i start the car for the day, after 4-5 starts it goes away. I have checked my ground and power source for the amp and cannot come to a conclusion as to why it keeps happening. I am currently running 2 Infinity Reference 1230w's, a kdc-x491 kenwood excelon head unit, Sony XM-D9001GTR Amp, and 2 Pioneer Premier ts-c520PRS's. If anyone could help it would be greatly appreciated.

 

IMO it sounds like a problem with interference and power is traveling directly to the subs kind of bypassing the amp but that is just a guess.

 

hmm did you run your power wires and your RCAs to the amp down the same side of the car? to me it sounds like your RCAs are picking up interference from some kind of power source.

 

I was thinking the same thing.

 

It sounds to me like it's time to take that Sony in for some repair work.

 

signal ground is in contact with chassis ground and is picking up ground currents.. you probably have an RCA touching metal somewhere, likely behind your deck..

 

Actually I do have them running on the same side. If i change the set up to the other side and still pick up the same interference what should i do?

 

Sounds like you only need the white wire and not the red. My sub did the same until I only used one wire, no difference in sound, just no humming when not listening. I don't know why it didn't want both unputs, I think it was because of the nice deck, I think it could run 2 amps without using a splitter or something?

 

The interferance that RCA's picks up are not transmitted by the subs so you don't have to change sides. I could your amp putting out straight DC.

 

I've seen this before where the amp is fine for a long time, then for seemingly no reason, it starts making the sub vibrate when there's no volume. Amplifier repair is imminent. If it was just an rca grounding, then your amp would shut down. The subwoofer frequency is too low to see of hear dc leakage through the rca's. Swap that amp out for a different one for 5 minutes. That will tell you accurately if it's the issue or not.


Or, it could be the deck...swap it out next.