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FRONT & REAR CONNECTIONS
5
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(4)
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FRONT PANEL
REAR PANEL
(8) (9)
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CONTROLS & INDICATORS
FRONT PANEL
The HPA-4 has four independent headphone amplifiers or line
distribution channels. The unit provides 2 rotary controls and 2
stereo jacks per channel.
(4) INPUT SIGNAL SOURCE SELECT SWITCHES
Each channel features a rotary selector switch which allows you
to select any of the 4 stereo input source signals connected to
the INPUTS (3) of the HPA-4 to be routed to the selected chan-
nels of the headphone amplifier and line distribution output. Sim-
ply choose the source signal desired for that channel.
(5) VOLUME CONTROLS
Each channel features a rotary volume pot for variable adjust-
ment of the desired output level.
(6) POWER LED INDICATOR
This LED indicator illuminates when the unit is powered on by the
rear panel POWER SWITCH (7).
REAR PANEL
(7) POWER SWITCH
To turn the unit ON or OFF, press the upper or lower portion of
this button as indicated. The front panel POWER LED INDICA-
TOR (6) will illuminate when the power is “ON”. Before turning on
this unit, verify connection to the proper voltage AC source, check
all connections and turn down the level controls of equipment
connected to the outputs.
(9) AC VOLTAGE SELECTOR SWITCH
Before plugging in the power cord, check to see that the unit is
set for the proper voltage for your area: ~115v (60Hz) or ~230V
(50Hz).
(Note: use at the improper voltage can damage your unit and
void the warranty.)
(3)
FRONT PANEL
(1) STEREO HEADPHONE OUTPUTS
Four stereo 1/4” output jacks for connecting four stereo head-
phones
(2) DIRECT LINE DISTRIBUTION OUTPUTS
Four stereo 1/4” line level output jacks for use for line distribution
REAR PANEL
(3) AUDIO INPUTS
Four stereo-pair balanced, line level 1/4” TRS jacks for 4 stereo
(L & R) input signals. If only the LEFT (MONO) channel input is
used, the mono signal will be provided automatically at both the
Left and Right sides of the PHONE (1) and LINE (2) outputs.
(8) POWER CONNECTOR WITH FUSE HOLDER
Standard IEC power cord receptacle used to connect the AC
power to your unit. It features a built-in fuse holder for a
5X20mm, 0.5A/250V slow-blow fuse. If the fuse continuously
blows, shut off the unit and have it serviced by qualified service
personnel.
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