Mid bass cut out after installing subwoofer, Help!

[Jacobman 10+ year member]

I have had an alpine cda-9847 head unit and phoenix gold rsd 6.5 component speakers and an alpine pdx 2.150 amp to power them. I recently installed out of my brothers car a sub and small amp to check it out. It was working and then it shorted and a red light on my head unit came on, I then noticed my speakers were way not as loud and assume my mid bass is not playing, it is deadly quiet. What are your thoughts?? Also what does the red light mean?

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[The Camry]

I have had an alpine cda-9847 head unit and phoenix gold rsd 6.5 component speakers and an alpine pdx 2.150 amp to power them. I recently installed out of my brothers car a sub and small amp to check it out. It was working and then it shorted and a red light on my head unit came on, I then noticed my speakers were way not as loud and assume my mid bass is not playing, it is deadly quiet. What are your thoughts?? Also what does the red light mean?

Red light on your head unit came on....WHAT? Do you mean the protect light on the amp?