Nady Systems HPA-4 User Manual

5

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)

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)

Each channel features a rotary volume pot for variable adjust-
ment of the desired output level.
(6)

This LED indicator illuminates when the unit is powered on by the
rear panel POWER SWITCH (7).

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)

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.)

Four stereo 1/4” output jacks for connecting four stereo head-
phones
(2)

Four stereo 1/4” line level output jacks for use for line distribution

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)

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.