Subs amp going into protection mode after turning it up HELP

[Jeano221]

So I’m having a issue with my amp going into protection mode after turning the radio up, it’s a stock bmw radio and the positive and ground are 11.90 when cars off and 13.60 when car is on, I switched amp snd still did the same thing... don’t know what else to check. Do if anyone can Help me out on what test to do or where to check..

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What amp/sub are you running and at what impedance ? Did you do any electrical upgrades (alt/battery) ? Was the amp tuned properly (gains, lpf, etc.) ?