HP 98568A Installation Instruction page 470

HP 46081A Speaker Module
Description and Support
The HP 46081A Speaker Module is used to extend the distance between
HP-HIL devices and includes an audio speaker on a separate circuit, with a
3m audio cable. It connects to your computer via the HP-HIL interface, and
occupies no HP-HIL address.
HP 46081A Speaker Module
Series 300 HP-UX Operating System Support
on Release with Model
5.0 or later all Series 300
10-28 Adding Miscellaneous Peripherals