I believe that any CD/DVD player is compatible with HDCD discs in that they will play them with 16 bit resolution, but you need an appropriate HDCD chip set to get the 20 bit equivalent resolution and other benefits HDCD's are capable of. Considering the fact that there are over 6000 titles with HDCD decoding which probably outnumbers all other "high resolution" digital formats combined, your question is an excellent one. I don't believe any Sony players have the HDCD chip set. There will be an HDCD logo on the player if it is capable of fully appreciating the benefits of HDCD. The biggest differences between HDCD and SACD is that there are many more HDCD titles currently available are usually less expensive and that HDCD can be played on any CD/DVD machine, while SACD's should be capable of considerably better sound than HDCD's, they require specific machines to play single layer discs, dual layer discs should be compatible with all machines and the number of titles is of course limited and complicated by the fact that there are in fact two variteies, one of which as previously described requires specific machines to decode and while growing there are less titles and those titles can be more expensive that standard CD's or HDCD's.
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