Great Info. Just not sure I'm ready to shell out $600 to $800 on a sub when I'll have to buy a new amp to match the 600w RMS. After doing some research I found some Super Shallow Rockford Fosgate R2's for around $100 a pop. RMS is 200w for the 10's and 250w for the 12's. I have a bridgeable 4channel 500w amp sitting in the garage so I could really save some money if these things are worth a crap. Is RF quality still as good as it used to be? Amazon & Crutchfield reviews look good, but sometimes I question whether these people actually know what they are talking about. Anyone have any experience with the RF R2's? I'd really like to hear from someone who's used these.