Vidikron VL-57 - Manual (Page 20)

Controls and Functions
8 Vidikron VL-52 and VL-57 Owner’s Operating Manual
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24. AIR (Antenna) Input (VL-52 only)
75-ohm coaxial input for connecting a TV antenna to the digital TV input.
25. CABLE Input (VL-52 only)
75-ohm coaxial input for connecting a CATV system to the digital TV input.
26. RS-232 CONTROL PORT
A female, 9-pin D-sub connector for interfacing with a PC or home theater
automation/control system.
27. SPEAKER OUTPUT (RIGHT)
28. SPEAKER OUTPUT (LEFT)
For connection of the right (27) left (28) speakers. Connect a speaker with an impedance
of 4 ohms.