I was wondering if anyone has any experience with Polk/MOMO MM2104 10" subwoofers? What are your thoughts on these? Thinking about replacing a 7 year old set of 10" Rockford Fosgate HE subs with these and wanted to know if it is worth it. I can get 2 for $99.99. The sealed box that I am using has approximately .67 cu ft. per chamber. So it seems like it would match up with the Polks pretty well. I would be powering these subs with a Alpine MRP-M450 with the 2 subs wired in parallel to run at a 2 ohm load so they would be seeing 400 watts RMS from the amp. Do you think this will power a pair of these subs adequately? Any input is appreciated.