Proel HPAMP104 - Manual (Page 2)

INTRODUCTION
The HPAMP104 is a 4-channel Headphone Amplifier boxed in a very compact and portable package, allowing
up to 4 different people to listen to the same program, while each listener can set its own volume level using
the dedicated output level controls.
HPAMP104 features one input in ¼” JACK and a standard dual RCA jacks that can be set as stereo or mono. The
signal is amplified and sent to 4 x ¼” JACK stereo headphone outputs with individual level controls, each one
with +20dB max output level (per channel). Each output is capable of driving 16 ohm output load impedance.
HPAMP104 is powered by a DC adaptor included with the unit.
CONTROLS AND AUDIO CONNECTION
1. HEADPHONES stereo jack outputs
These are the 4 STEREO JACK connectors for the headphones output: only stereo headphones with a minimum
impedance of 16 Ohms should be connected to these outputs. The stereo jack connectors are wired as
follow:
Tip = positive LEFT channel signal
Ring = positive RIGHT channel signal
Sleeve = common negative shield or ground for both channels
2. HEADPHONES LEVEL controls
These controls set individually the level of each HEADPHONES output. The signal of the 4 outputs is the
same.
3. PWR indicator
The PWR LED shows when the HPAMP104 is powered. If the LED doesn’t light, be sure that the DC ADAPTOR
is connected to the mains line and to the HPAMP104.
4. 12-18VDC socket
Here’s where you plug in your external power supply. You should always connect your power supply to the
HPAMP104 before you plug the power supply into an electrical outlet. Make sure that all level output knobs
are turned all the way down when powering your HPAMP104.
5. STEREO / MONO switch
This switch set the inputs as stereo or mono, when set as MONO only the signal of the LEFT input (RCA or JACK
tip) is send to both left and right earphone of each headphone output.
6. RCA Input
These are two female RCA connectors, which accept a line level input signal from almost any source. White
identifies the LEFT channel and red the RIGHT channel. They are wired as follow:
Tip = + positive signal
Sleeve = shield or ground
7. STEREO JACK Input
This is a STEREO JACK connector, which accept a line level input signal from almost any source, also an
HEADPHONES output of another device. This is used alternatively to RCA inputs and it is wired as follow:
Tip = positive LEFT channel signal
Ring = positive RIGHT channel signal
Sleeve = common negative shield or ground for both channels
When it used as mono input only the Tip signal is send to both left and right earphone of each headphone
output.
ENGLISH