Could anyone tell me how difficult it is to run a small (hopefully underseat) active sub off the standard CS197 update list HU? I have a decent alpine HU from my old car with sub ctrl but I really want to keep my new one standard (hence the underseat sub instead of boot beast!) Also has anyone already done this - if so what's the sound like as these little subs are only 180w ish - dont want anything mind blowing just think the standard system bass performance is poooor! thanks!