Stereo Headphone Monitoring System
The stereo headphone monitoring system was designed to monitor the vocal, direct from the mic capsule, and mix it with an external line level input signal, such as a monitor (foldback) signal from a mixing console. The combined signals are sent to the stereo headset after being amplified by the beltpack's stereo amplifier. This allows the user to adjust his own mixing balance and master sound level independently of other performers. Disconnecting the head- phone makes it possible to use the headset only as a microphone.
The monitoring system is powered by two 1.5 volt "AA" dry cell batteries, which are housed in the beltpack. To operate the unit, turn the battery power switch to the "ON" position. Please note that even though the HY headset is designed to operate from an external "Phantom" power supply, the monitoring system, because of its relatively high power requirements, still requires power from the batteries in the beltpack.
Control Panel Diagram | ) Line Mode |
| Selector Switch |
Monitor Balance | Monitor Level |
Control | Volume Control |
) Battery | Mic | |
Power Switch | ||
Output Connector | ||
|
Line
Input Jack
Battery Power Switch and Phantom power supplies: This switch turns the beltpack battery power supply
on or off. Setting the switch to ON supplies battery power to the mic capsule as well as to the head- phone monitoring system. If phantom power is sup- plied from an external source to the beltpack, the mic capsule is automatically switched to the exter- nal source for its operation, regardless of the posi-
tion of the BATTERY POWER SWITCH.
NOTE:
The headphone monitoring system always requires
battery power from the beltpack, due to the relatively high power requirements common to this type of system.
Line Input Jack:
This jack accepts any line level input signal, and is rated +4dB
MODE SELECTOR SWITCH to STEREO or MONO
according to the type of 1/4" phone plug which is
inserted into this jack.
Mic Output Connector:
The vocal signal from the headset microphone is routed to this XLR connector. The signal available at this output is not affected by the settings of
either the MONITOR BALANCE CONTROL or the
MONITOR LEVEL VOLUME CONTROL. The output
impedance is 250 ohms balanced, and would typically be connected to a low impedance XLR connector of a mixing console or powered sound system.
Line Mode Selector Switch:
The switch setting should be determined by the type of 1/4" plug (stereo or mono) which is inserted into the LINE INPUT jack. Place the switch in the STEREO position when a stereo plug is inserted, and to MONO when a mono plug is inserted. Set-
ting the switch to the MONO position when a stereo signal is inserted will cause the "R" signal to be disconnected from the circuitry, and only the "L" signal will be heard through the headphones.
Please see the block diagram for a full understan-
ding of the signal flow path.
Monitor Balance Control:
This control adjusts the balance or "mix" heard through the stereo headphone system, between the direct vocal from the headset mic, and the line in- put signal. The volume of the direct vocal in- creases in relation to the level of the line input signal as the control is rotated toward "MIC," and decreases as the control is rotated toward "LINE."
Monitor Level Volume Control:
This control adjusts the volume level heard through the stereo headphone system. It does not in any way effect the output of the mic signal through the
MIC OUTPUT connector.
— 4 —
