UNiKA
PRO 248
User Manual
5
The most widely used DI box is to connect electronic
musical instruments, sound source of A/V equipment
and computers, convert their output signals into
balanced signals and then extend the transmission
distance.
The most ideal state is to set the attenuator to 0dB
position (button up) for musical instrument. For some other type of signals, you can press
the button to make the signal is attenuated by 20dB to avoid clipping caused by signal
overload.
When the button is pressed, the PAD indicator on the right will light up.
This attenuator acts on the input terminals of CH-1 and CH-2 at the same time.
INPUT PAD ATTENUATION
The built-in channel independent balanced isolation
transformer has solved the potential difference leakage
problem. When the system causes a ground loop due
to poor wiring, the noise can be eliminated through the
GND/LIFT button.
The GND/LIFT button determines whether pin 1 of the
output XLR is grounded, grounded when it bounces,
and disconnected from ground when pressed.
ELIMINATING GROUND LOOP NOISE
POWER SUPPLY
PRO 248 is an active DI box and re48V
phantom power. It can work normally when it is
powered, but no additional power supply is required.
Just use balanced wires to connect the device to the
mixer’s input channel, and turn on the +48V power
switch of the mixer, similar to connect a condenser
microphone to the mixer.
When the +48V power supply is suppling properly, the
+48V ACTIVE indicator light on the upper cover will
light up.
Before connecting the device, do not turn on
the +48V switch of the mixer.
