Ok, I finally started a system install on our boat and had a few questions. I have teh pioneer 1400 deck (i know, its the bottom of the line, but someone gave it to me). When i crank it up and there are speakers connected to the internal amp, the screen dims when the bass hits. Is this a lack of power problem? Its in the boat, so i have only used it with the battery power. Second question, on 6x9's, if I'm goign to have a sub to put out the low frequencies, what frequency its pretty standard to cross them over at? I know bass blockers are just capacitors, so what capacitors do i need to cross them over at the right point? Then what crossover point is recoomended for most subs? Its a JL 12w3. Thanks guys!