I have a 1200 watt sony xplod amp hooked up to a 15" SBL Gorilla sub. The bass hit for a while and then started to cut off. Now it wont work unless i touch the remote wire to the power wire, and even then it cuts off after every time it hits. I have 8 guage wires hooked up to the system. It also did this when I hooked my 200 watt Jenson amp to the 15". What could be the problem?

wire each sub in series inside the box, this makes them each 8 ohms, then run them parallel from the box to the amp bridged. this will give you 500 watts at 4 ohms

You only gave us the model of the amp so I will make an assumption that your 12" subs are the Sony XS-GTX120LW. First, they cannot hold 1200 watts a piece. They are meant to be powered with 350 watts RMS. They will hold 1200 watts peak. That means that 1200 watts for a few seconds will be ok. Past that and kiss them goodbye!

Next you indicated that bridged the amp. Since the subs are both 4 ohm single voice coils did you wire them in series or parallel?

It sounds to me like you wired them in parallel resulting in the amp seeing a 2 ohm load. The amp you referenced is only stable when bridged at 4 ohms.

Has the amp begun working again once it cooled down? If not you could have fried the outputs by having the resistance too low.

you can blow a sub out when they are overpowered as well as underpowered. Distortion is the main reason thing go out. distortion occurs when you have the volume n the head unit up all the way and the gains on the amp are up all the way. always make sure the bass plays clear and you should be okay

Check your RCA cables, it may need to be replaced

You need more current.Bass notes require more juice and the best way to get more power for bass is to add a power capacitor to your system . They are easy to install and you can get one for less than a hundred dollars that should be enough for your amp and subs.

What kind of subs are you running? Meaning what brand, what are the ohm, spl and wattage? I'll look up your amp while you get that info to me. Looking forward to helping you:) Thanks!

If you are certain speaker isnt blown and you have correct phase wiring and so forth you have whats called a solder jump which is internal repair by dealer only! buy a new amp at dealer wholesale price here cheaper than having it repaired unless under warranty go here for wholesale pricing on almost everything audio wise:
www.godspeedaudioheaven.com

The best thing to do is to get a amp that is more watts than your subs, not the other way around, speakers are known to handel a lil more power but amps cant produce more power than they are capable of... your ground wire should be thick also, say 6 to 8 mm or so, and its best to put in a cap and an equalizer.
Cheers

Check the Polarity on the subs, you might have to invert one. Best way i know of to test is get a BASS CD -=download a bass test cd...legally of course=- and check for a test that will just flutter the speakers in and out and see if they both go in and out in the same way, if one is in and the other is out that could be your problem

A faulty voice coil may be to blame on one of the subs...when it heats up it starts to act up leading to a undesired preformance.