ive been messing with the R's since they come out
if you want to cruise around all day full tilt, dont send more than 1000 watts to the 12. For burps... its one HELL of a woofer. Took on an autotek mm4000 without issue. It also handled a viper 2500d @ 1 ohm for short periods (most of a song, depending on song) and got stinkin loud.
The type X isn't nearly as loud as the R, especially given the same power. But wow does it sound good.
The R's are cheap... way TOO cheap for what they do.
And the type R is more comparable to the RE SX, not the SE. The R definitely sounds better than an SX, and gets just as loud. The SX should handle more power RMS with the bigger coil... but the R is no slouch as far as long term power handling.. particularly the 15. Given an *actual* 1500 watts it handled it just fine for full songs.
Best woofs for the $, hands down.