PRO 148 is an active single-channel DI box. Unlike a
traditional DI, PRO 148 uses +48V phantom power instead of the traditional 9V
dry cell battery, so users can use it on the mixer or external phantom power
supply. Power is supplied to PRO 148, the power supply circuit and the output
signal line are shared, and no additional power cord is required. The +48V
indicator is set on the upper cover. The +48V circuit specially selects the
British OEP PT-4 pulse transformer. PRO 148 has a built-in UNiKA-PROTM EI30A10E 1+1:1+1
isolation transformer, which has a special copper foil layer and a dedicated
ground layer, which allows this device to restore high signal/noise ratio and
dynamic sound, and can avoid unnecessary leakage caused by radio frequency
interference, ground interference and potential difference. PRO 148 is
especially suitable for electronic musical instruments, recording studios and
fixed installation projects by using mixers. The PRO 148 uses a balanced/unbalanced combo socket on the
input, and a TRS through out is convenient for musician to pass the direct
signal to the instrument amplifier. In addition, it is equipped with a 0/-20dB
attenuation switch and LED indicator, which is suitable for various types of
audio signals with high and low impedance. The output terminal is also equipped
with a GND/LIFT button to quickly eliminate ground noise.
Use British OEP PT-4 1:1 audio pulse transformer in phantom power circuit
+48V status indicator on the upper cover
The input socket uses Combo jack
Use TRS jack as through out terminal
At 0dB input, the set load impedance is 260KΩ, which can clearly show the high frequency overtones, harmonic and graininess of electric guitars or electric bass
50Ω ultra-low impedance output, suitable for various types of mixers and pre-amp equipment
There is 0dB/-20dB input signal attenuation switch with status indicator
