I recently traded my s15L5's for a zxs1500.1, that I will put on a single s15L74 in a 4cu box. Does the "s" stand for small hahaha....but is this thing real? I have a '10 Jeep Patriot, it has a duralast gold in it already. Do I need more power? I had 1 L5 on a "3k" boss audio amp, no problems with lights unless engine was off.