The deck alone has enough processing. You might not even need to adjust the controls on the amp [emoji38] -Time alignment -13band EQ with an autoEQ if you have the microphone -Built in cross over And more If you put a preamp you'd get fingertip controls, but how often you really going to be adjusti...
Good day all , I have a pioneer avh 4800bs and a powerbass xma 5 channel amp. I'll like opinions on if I should install a preamp or crossover in between head unit and amplifier or both