Jon: This is just an educated guess after reading the info included in both the K2's and XRCD's (which is in much greater detail) included with the CD's about the remastering process. It appears that both use 1) JVC 20 bit 128x oversampling 2)JVC K2 super coding and 3) the K2 interface to eliminate jitter.
The only difference that I can really ascertain (and I have no idea what difference it would make) is that the K2's are remastered using a JVC DAS-900 and the XRCD's (at least the 20 bit one that I own of Waltz for Debby) are done using a Sony PCM-9000 which uses a magneto optical disc (no idea if the JVC DAS-900 uses the same optical disc system or tape-perhaps some techies might chime in).
The K2's are a bargain; after hearing them I wouldn't bother to pay the extra money for XRCD's. In fact, I'm ordering 2 more tomorrow.
The only difference that I can really ascertain (and I have no idea what difference it would make) is that the K2's are remastered using a JVC DAS-900 and the XRCD's (at least the 20 bit one that I own of Waltz for Debby) are done using a Sony PCM-9000 which uses a magneto optical disc (no idea if the JVC DAS-900 uses the same optical disc system or tape-perhaps some techies might chime in).
The K2's are a bargain; after hearing them I wouldn't bother to pay the extra money for XRCD's. In fact, I'm ordering 2 more tomorrow.