I doubt it is a coincidence that 16.9344 multiplied by 4 is 67.xxx.
Right ... perhaps because Kenwood had issues obtaining the orig 67.737 Mhz by the time the dp-460 came out (mid 1987); the dp-750 (with 67.737 Mhz) is from mid 1986.
Not sure whether the higher Mhz xtals are harder to cut for low-jitter applications.
About jitter, that plastic "jitter jacket" -- shown in photo of KDS 16.93444 -- is new to me. In the serv. manual, the jacket itself has dedicated part no.!!
The mystery remains about my measurement of 55.234 Mhz on X_o and X_in (pins 12 and 10) on the dp-460 DAC chip. In my dp-750, I measure (with a Siglent o'scope) a pure 67.737 Mhz sine wave.
Cannot find diagram, only two datasheets of different Toshiba DACs; TD6710 and TD6720.
Yup ... I have those already, and they are not very detailed, maybe deliberately by OEM to protect IP. Philips and Burr-Brown produced much better datasheets.
IAC ...
If you go to
https://www.dutchaudioclassics.nl/the_complete_d_a_dac_converter_list... and look for any of those TD chips -- TD6709, TD6710 and TD6720 are identical -- you'll note CDP they are used in. Then you can look for a serv. mnl thru the usual free portals like Archive.org.
Here are screen captures from a Sansui CDe70 schematic, that uses that same "OEM" circuit (which may have been Toshiba???). Note the td6709 with the 67.737 Mhz xtal.