In my opinion the type-r's are comparable to the diamond Cm3's, though the diamonds may have a bit more spl. But they are not even close to the M6's, and the type r's to be mentioned int he same sentence in the tdx should be illegal. So you really need to be more specific, but im assuming your talking about the cm3, cm3 handles a bit more power, im happy with mine, just go listen to them, both are available at most local shops, hell type-rs are even at circuit city. I also don't believe type r's are that great in ported boxes, ithink they are more sq drivers. the cm3 does sound pretty good in a ported, though i prefer sealed.
-Jason