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As long as the gain is adjusted properly for the input, there should be no problems with the amp.
The head unit preamp output is probably a little low or there is too much voltage drop on the RCA's. It doesn't take much of a drop when you are working with such a low level to begin with. That's one reason that Alpine gives you the option to select an input level.
It's also possible that the input sensitivity of the Alpine is slightly high. Electronic components usually have a nominal value and their actual value can range up to 20% from that nominal. But again, you have a gain adjustment to insure that the amp is not overdriven. Make sure that it's set so there's no distortion and you should be OK.
turn off all the settings on the amp for (example, sub ,comp, lpf, etc put them all on the off position and then turn off your car remove your face plate and then try it agin it worked for me. but dont turn up the settings to loud the subs might nit be able to handle all the power thats y it does that
I would either try a bigger fuse, if possible, or turn the power output dial on the back of your amp down. This can be done with jus a simple flathead screwdriver. I suggestion would be to go out and buy a power monitoring cap. Wal-mart, or Tweeter usually distributes them. It'll have a LED reading on the top, with two wire hook-ups either on the bottom or the top for positive and negative, place this in between your amp and your subs in the wiring set-up.