JK Audio RemoteAmp - Manual (Page 2)

2
Input
The input XLR accepts line level signals from your mixer,
distribution amplifier or phone line hybrid. The balanced
input XLR is wired:
Pin
1 Ground
Pin 2 Signal +
Pin 3 Signal -
This is a transformer balanced input. If you are using an
unbalanced source, you must connect your signal lead to
pin 2 and then connect your ground to pins 1 and 3. Do
not connect a powered input to this device.
Output
The 1/8” earpiece jack is current limited to prevent exces-
sive signals into your earpiece. This mono jack will power
earpieces with an impedance of 150 ohms or greater. If
you would like to use light-weight stereo headphones that
are typically 8 to 36 ohms, wired with a 1/8" stereo jack,
you will need to use an adapter to plug into the 1/4" stereo
headphone jack. Or you can solder a jumper wire across
the top of the 150 ohm resistor, R2.
The 1/4” headphone jack is wired for either a stereo or
mono plug. If a stereo headphone plug is used, you will
hear signal in both the left and right ears.
A 1/4" mono plug can also be used without any problem,
however, if you plan to always use a 1/4" mono plug, you
might consider a simple modification to the RemoteAmp.
Description
3
Operating
Resistor R3 provides signal to the "ring" of tip-ring-
sleeve. If you clip one of the leads on R3, you will dis-
able stereo operation and increase the power available
to the left or mono output. Another common solution is to
wire your headphones with a stereo headphone plug but
wire both ears to the left channel (the tip of the plug)
and leave the ring unconnected. This has the same ef-
fect as clipping the resistor on RemoteAmp.
Gain Adjustment
Behind the back cover of the RemoteAmp you will find a
jumper on the circuit board which allows you to adjust
the maximum amount of gain the RemoteAmp delivers.
In the factory default open position you will receive a
maximum of 25 dB gain. If the jumper is set to the op-
tional closed position, a maximum of 40 dB gain will be
delivered.
Battery
An alkaline battery is strongly recommended. The bat-
tery test indicator shows the strength of the battery
power remaining. A bright light indicates plenty of power,
a dim light reminds you to be prepared with a fresh bat-
tery. Once the LED stops responding to the test switch,
you will begin to hear signal breakup and distortion as
the battery is drained of its last breath which may mean
minutes or hours depending on the circumstances.