output converter

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...

I am installing an amp for a sub in my 2011 F-150 with the factory HU. Since my amp does not support speaker-level inputs, I am using a speaker to line level converter that will be tied into the Rear speakers, allowing me to use Fade to fine-tune how much sub I get. Either way, using...