2 things one Get Rid off boss and last thing if your trying to power up subs you should never use a class A/b or mosfet amp i would always go with a Class D amp for subs break down from my years of car audio
I always run class a/b amp for high and mid speakers(Component sets or interior speakers) and a Class D for the Subs
reason being I feel i get a deep sounding bass with class d and I have tried to run all class on subsand when it comes to tuning i like the class d amp better other class amps seems to distort easy its just my advice and experience Good luck