Finding original data

Harman-Kardon built a 240-watt 9-driver premium sound for the 1995 Jaguar XJ-6. Head-unit carries an auto-reverse cassette deck and a trunk-mounted 6-CD changer.
Does anyone have a “white-paper” or other spec. sheet on that system?
I prefer not to dismantle the vehicle to find the size of various (sub-woofer/door) drivers.