Amp cutting out when bass hits

make sure that all the connections to the power supply are tight. The protection circuit is doing this so that your amp do not burn up. The size of your amp also demand heavy wiring. Make sure you used the recommended size. Also you need to make sure that the battery and the alternator can keep up with its large demand. You may need an extra battery too. I know a single battery can deliver a lot of current, but a powerfull amp demands the current really fast, when the bass hits. You can use a large damping capacitor, they are extremely big, or you can add another battery. All these will also give your amp more thump, and make it operate at full efficiency. meaning even louder! If these do not solve the cutting out issue, you may have to turn down the gain down slightly. Every type of music do not deliver same amount of bass, hip hop music, and rap would require you to trim down the gain some. Bass is delivered at its best in moderation, too much and you end up with a rattle rather than solid bass. I have a 4,000 watts amp at home, I don't use it in my car. I got it rigged up as a house stereo. I bought it for a 100 bucks broken, and fixed it. I have worked with hundreds of car amps a before in a electronic shops, I also design small amps once in a while. I myself love those loud gadgets. Well hope it has been helfull. Goodluck.

the trouble might be the power supply section of the amp, inside the unit, have it checked, use a multimeter look closely to watch how the voltage varies when turning the volume up

With an amp like that you can not pull enough power from you cars battery alone. That is why when it hits hard it drains the amps from your battery and you amplifier cuts out. The light on the amplifier most likely dims when the bass hits. You need to get a capacitor. They are easy to hook up on the main power wire. You can get one from http://phatcaraudio.com/capacitors.html or get a used one off ebay.com. Good luck