are there any powered subs that are worth their salt at a relatively low price? I have infinity kappa perfect 5.25's and im going ot install them once I recieve the memphis 16-pr200.2 I just purchased. I wanted to round out my small system with a powerd sub but I am not sure what kind etc. I have a dakota truck so I dont have much room and I have heard that running a sub off the same amp as my speakers would be a bad idea. my head unit is preamped and runs at 19 rms per channel not enough for a sub so Im thinking power built in but what is a reasonably nice powered sub? any ideas?? thanks in advance for any well needed info. peas nik