PRO 148

OVERVIEWS

PRO 148 is an active single-channel DI box. Unlike 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.

DESCRIPTION

FEATURES

.Power by external +48V phantom power
.Built-in UNiKA-PROTM EI30A10E isolation transformer
.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
.The output is equipped with a GND/LIFT switch

SPECIFICATIONS
PRO 148
Circuit principle Active low-noise op-amp with Transformer balance output
Input connector 1 x Combo
Thru connector 1 x TRS
Input pad switch/indicator 0/-20dB push button with LED
Power supply +48V Phantom power through output connector with LED indicator on top cover
Output connector 1 x Male XLR through ISO Transformer
Output GND/LIFT switch Push button
Input impedance 260KΩ / 0dB, 50KΩ/-20dB
Output impedance 50Ω
Max. input level before clipping +10dB
Max Output level +10dB
Frequency response 20Hz-20KHz, +0.3/+0.6dB
S/N ratio @20Hz~20KHz un-weight >95dB
T.H.D. @1KHz 0dBV output <0.02%
Transformer Ratio 1:1+1:1
Chassis 1.6mm/1.2mm steel cabinet and chassis
Surface finished Durable complex painting
Dimension (W x D x H) 78 x 124 x 46 mm
Weight 0.56Kg
Shipping weight 0.59kg
Packing per carton 20pcs/12.40Kgs
Shipping dimension per carton 305 x 283 x 195mm
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