I just got a single 12" sub installed with a an Amp in the trunk and disconnected the stock sub since it was blown..

The system worked fine until a few hours later when I was listening to it parked, while the car was still running for about 15minutes when the Sub shut off..

When I started to drive the car again for about 10minutes the Sub came back on..and shut off once again later on.

Anyone know what could cause this problem????

 

My guess: the amp is overheating. That is usually caused by overdriving it or not enough air circulation.

 

so if it was overheatin it should of worked this morning right cause it would be cool by then.

I guess I can try another amp even though i am using a JBL 301.2II with 300 RMS and im only running one 12" JBL sub.

 

Having worked as an installer, I have to agree. There are a few things that can be causing this.

1. The wire you are using is not large enough. Both Power and ground should be 4 gauge. Also, do not forget to upgrade the ground wire at the battery (the OEM wire that connects the battery to the vehicle chassis).

2. Poor grounding. Be sure that the ground point is cleaned to show bare metal.

3. Circulation. If you are playing the sub hard and the amp is heating up, you need as much air as possible moving over it. Add a fan if needed.

4. Matching the impedance of the sub and what the amp should see. If you have a dual 4 ohm sub, you should really be using a mono block amp. On the same note, a dual 4 ohm sub should not be wired in parallel on a stereo amp. It can be wired in series, but will cut the power output of the amp in half (approximately).

5. Over playing the ability of the amp. You really need to open the trunk and listen to the sub for distortion. Turn it up slowly and figure out where it begins to distort. This is where you DO NOT want to listen to it. Always keep the volume below that point, or turn down the gain.


You will want to be sure to match the gain of the amp to the input and the volume of the other speakers. To do this you will want to turn the gain down on the amp and turn the stereo to a little more then 3/4's. Then turn the gain up till it begins to distort. Then turn it back just a hair. This should get you pretty close to matching the inside up to the sub.

Good luck.

 

I'm no expert but don't some amps have that ability where they shut off if there over worked. I remember in my friends car we turned his headunit sub control all the way up and his system shut down for a while. 250 JL amp w6v2 10"