Stereo Headphone Monitoring System - Toa HY1 Instruction Manual

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
Monitor Balance
Control
Battery ———
)
Power Switch
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 10K-ohms. The jack would typically be
connected to either a stereo or mono send from a
mixing console. It also serves very well as an input
for a tape deck or other pre-recorded music
source, except a magnetic turntable. Set the LINE
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.
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Line Mode
)
Selector Switch
Line
Input Jack
— 4 —
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.
Monitor Level
Volume Control
Mic
Output Connector