I found something myself last night that might help clarify this issue. On page 3-21 of the KDFX User's Guide it states that the "DigOut" parameter at the bottom right hand corner of the EffectsMode page selects between 16-bit and 20-bit operation. Three paragraphs down from this says "Note that the switch does not affect any of the K2500's inputs: those are always operation in 16-bit mode."(posted 9205 days ago)So it looks as if the A/D converters are always 16-bit and the D/A is selectable at 16-bit or 20-bit.