So, I inherited a Nakamichi PA506 amp and a nakamichi 10" sub that I just installed in my truck, but I have no manuals to go with it. I connected the fused power lead directly to the battery, grounded it to the chassis, and connected the blue remote lead from the head unit. Got the input hooked up and the sub wired, and man does it sound great! Really rounds out the 4 polk 6x4 in the cab. Here is my question though.....When I connected it to the battery, i had a decent spark, but had good power to the amp and everything worked as it should. Does it continue to draw a lot from the battery, or does it just maintain a slight charge until signaled by the head unit? Total noob question I would guess, but this is the first car stereo stuff I have installed and want to do it right and not come back to a dead battery. Any help for a new kid would be appreciated!