This guy doesn't know what he is talking about....there is no reason that the 10" wont be able to play all frequencies.i say the type x's should bang....in the right box with right amp no doubt
2000rms over 1000 and should be way loud...may not hit all levels of freqencies(10's)
X's are more SQ oriented and are known to play very low, while the R's are more SPL oriented but sound fine to the casual listener. I just prefer the R's cause you can get them so cheap