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I'm using that Alpine right now for 2-12" subs and I have compared it to 6 or 7 other amps this month and most were 4 channel 150Watt/Channel Bridged to 300Watts x 2 and found the Alpine to be superior in both sound quality and loudness. The Alpine has also not turned off even with full volume for hours at a time, Very solid amp I was very surprised due to it's size!
You may have blown a fuse, check those to make sure they aren't blown. Verify that the connections are in place again and make sure the settings on the amp are correct as well.
If the fuse isn't blown and the connections are secure, I would make sure that the wire that you have ran from your battery is within the specifications for use with your amplifier.
Is your gain all the way up? If it done this before, sounds like your over working the amp. Make sure your subs ohm load is capable with the amp load to. If they are 1 ohm and your amp is only 2 ohm stable, it would beat for a lil bit then go into protection mode to. Check your wires too.
Most likely one of your subs are blown, or the Ohm's are too low for the ampliphier. Try hooking up one speaker at a time to the amp and see if it does the same thing. If it shuts off on one of the two speakers, that speaker is most likely blown.
u might have to turned your amp so u can play both subs your amp might be to small to run both subs at the same time an u gotta play around with the settings on your cd player so when u blasted your subs it has that nice bass to it not that poping sound.
Check the 12v wire running from the battery to the amplifier. Also the sony explode is a garbage subwoofer compared to the Alpine.. sony (they say 1200w max but its more like 100w to power the thing) Amp could be going. Is the amplifier hot when running. If there is a burnt smell comming from the amp, its the amplifier
amp naturally get hot but not hot enough to burn your finger.if all the speakers working,no distorted sound(sound clear),the problem might be the ventilation(free air flow) of amp.check the blower fan if working or check the exhaust holes maybe it is blocked.
here are the other reasons;
1.)speaker wires touched the chassis ground.
2.)mismatched speaker to amp impedance.
3)overdrive input or u tap low input(from amp)
to high output(of stereo)
4.)ur amp is out of bias.
u need an audio technician for this...
hope this help u...
im having the same problem with my amp, I took it to best buy and they said the amp was recieving power and recieving signals from the deck and i had everything hooked up right but that in the circuit board all the connections were blown, meaning i have a blown amp, i hope this isnt your problem but it definetly sounds like it. GOODLUCK