HDS-16/HRM-16 HEADPHONE DISTRIBUTION SYSTEM
INPUT FROM HDS-16
This connector delivers the input signals and power supply from the HDS-16 (parallel) or from another HRM-16’s OUTPUT TO ADDI-
Headphone | Power Loss per |
Impedance | 100 feet of Cable |
TIONAL HRM-16’s connector (series).
The remaining rear panel inputs and outputs are ¼-inch TRS connectors.
EFFECTS SEND: Connect this mono output to |
■ |
an effects processor. |
■ EFFECTS RETURN: Use the L input for a |
mono return (panned center) or L and R inputs |
for stereo effects. |
■ LINE OUT: Use this mono, line-level output to |
route the HRM-16 to a monitor system. The |
LINE OUT and headphone signals are both |
affected by the MASTER VOLUME and HI/LO |
EQ controls. |
■ TALKBACK SWITCH REMOTE: Plug a mo- |
mentary switch into this jack to use instead of |
(or in addition to) the TALK button. |
OUTPUT TO ADDITIONAL
HRM-16’S
This connector carries the same signal sent to the INPUT FROM HDS-16 connector. Con- nect this output to another HRM-16’s INPUT FROM HDS-16 connector to achieve a series connection. An output that simply replicates the input is often called input through because the signal is sent out before being processed in the device. As a result, the HRM-16’s top panel controls do not affect the OUTPUT TO ADDI- TIONAL HRM-16’s signal.
HDS-16 AND HRM-16
PROTECTION CIRCUITS
746 mW vs. 770 mW
600
-0.34 dB
257 mW vs. 260 mW
Table 1: Centronics cable losses per 100 feet
HRM-16
The headphone driver and power supply regu- lators are protected against over-temperature and current overloads. The regulated power delivered from the HDS-16 to the HRM-16 is protected against over-current by PolySwitch resettable fuses inside each HRM-16. These fuses prevent a defective HRM-16 from shut- ting down the HDS-16 or attached HRM-16s. Both devices reset automatically after clearing the fault and removing power to the circuit.
HDS-16
The regulated power delivered from the HDS- 16 to the HRM-16 is protected against shorted cables by an over-current crowbar circuit. The affected power supply turns off in response to an over-current condition. Restore normal operation by removing the defective cable or HRM-16 and turn off the power to the HDS-16 for at least 30 seconds.
The AC-line fuse is a 1-Amp Slo-Blo. Replace it only with a fuse of the same type and rating.
