I'm not current with the latest line or model numbers of the RF amps, but if you have the older 12w6's, you'll either be running the subs at either 6 ohms or 1.5 ohms.

300 watts RMS a piece (so 600 watts total) is a good number for these 2 subs, so try and find an amp that can produce that kind of power at either 6 ohms or 1.5 ohms....