Luxman's only D.A.T. recorder, meant to go with the equally rare digital/analogue LV-109 integrated and LE-109 phono preamp, all three being part of the real "black plague" era.

Apart from 5 windings (!) for the different sections, the KD-117 had a fairly unusual feature in the shape of a low-pass filter switch for the dedicated CD input, with fine calibration level pots for the said input !
But given the fact that all CD players already have LPF and the impossibility to record at 44.1 on the KD-117 (whether in digital or analogue), this seems like a fairly dubious function... The analogue CD inputs are in fact followed by analogue CD outputs, allowing to loop the CD player through the KD-117 and benefit from the (...supplementary) LPF.
The KD-117 had optical digital i/o's along the better coax' and, if it didn't know about SCMS, it still couldn't make a 1st gen' digital>digital dub if a "copy prohibit" flag was present on the original tape.

Last but not least... Sony did OEM the mechanism for Alpine ! So the drive and drum assy' in the KD-117 are the same as in Sony's own DTC-1000ES (just like they are in Pioneer's original D-1000 btw).

...more about the KD-117 in france... and meters-wise...