Tanx Paul, you're very kind. But what i really want is a DTI.
The EDI interface with "I squared S" it's an interesting device because it provides acess to the raw serial 16-bit digital audio data after it has been decoded from the incoming s/pidf delivered by the cdp just before the D/A converter. It means that this thing allows digital signal processors like equalization or reverberation enhancement - for room treatment equalization-feedbacks - to be connected do the DDE while keeping the signal in the digital domain.
Nowadays there are better alternatives to the EDI, like the Behringer DEQ2496.
Anyway tanx a lot for your concern, and if you came across the DTI, keep me post it.