Does anyone have any experience with the db Series subs? I have all Polk Momo components for the highs and US Acoustic amps. The Polk Momo subs are just too expensive. I've been researching different subs and the Polk db series seem pretty good. There doesn't seem to be much difference between the Momo and db series other than the look. Please let me know what you guys think. I want to finish my system and the last thing I have to buy are the subs. I'm looking for SQ not SPL so any help you guys could give me would be much appreciated. Oh, my vehicle is a 2005 GMC Sierra extended cab so the subs will be going in a pre-fab downfiring sealed box. Thanks!!!