Unika Box Series, DI-BOX2 User Manual

Box Series

Made in Taiwan

Index

USER GUIDE

DI-BOX2

01 Overview

01 Features

03 Audio Connection

04 Various Instruments Connection

04 Input PAD Attenuation

05 Eliminating Hum and Buzz and

the Ground Lift

05 How to Replace DI-BOX Battery

06 Specications

Unika Electronic Co., Ltd.

www.unika.com.tw

6F, No.168, Xin-Hu 2nd Rd.
Nei-Hu District, Taipei City. 11494.
Taiwan, Republic of China.

[phone]

[phone]

　　[e-mail]

UNiKA DI-BOX2

User Guide

OVERVIEW

The Unika DI-BOX2 is a 2 channels active direct box, it is very easy to use,

simply plug it in, turn on the power and it goes to work. However, there are

a number of features built in that should be understood in order to get the

most out of the DI-BOX2. So please take a few minutes to go through this

user guide to ensure you get the most out of it.

[e-mail]

If you still need further clarification, please send email to us and we will

do our very best to reply you in short order.

FEATURES

• 2 channel high impedance direct inputs for electronic musical instrument

signal feed.

• The ¼" TRS LINK socket carries a parallel-wired direct feed from the

input.

• Selectable 3 steps attenuator for Hi-Z direct input

• Accept power from plug-in 9V battery or +20V to +48V phantom power.

• 2 channel XLR Balanced Low-Z output with isolation transformer

.

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UNiKA DI-BOX2 User Guide

① ② ③ ④ ⑤ ⑥ ⑦

⑧ ⑨ ⑩⑪

①

Ch-1 ¼" TRS LINK socket carries a parallel-wired direct feed from the input.

②

Ch-1 high impedance direct input for electronic musical instrument signal feed.

③

Output Stereo / Mono mode selector, set the operation mode to Stereo, or in

Mono mode the 2 inputs are summed so that the outputs become mono.

④

Input PAD: 0dB, -20dB & -40dB selectable 3 steps attenuator reduces the

input sensitivity to prevent overload.

⑤

Ground lift switch, lifts the pin-1 on XLR output connectors to help eliminate

hum and buzz caused by ground loops.

⑥

Ch-2 high impedance direct input for electronic musical instrument signal feed.

⑦

Ch-2 ¼" TRS LINK socket carries a parallel-wired direct feed from the input.

⑧

Ch-2 XLR Balanced Low-Z output with isolation transformer.

⑨

Ch-1 XLR Balanced Low-Z output with isolation transformer.

⑩

POWER switch:

⑪

POWER ON/OFF LED indicator.

Used to switch the power ON/OFF.

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UNiKA DI-BOX2

User Guide

AUDIO CONNECTION

Instrument direct input & Parallel link connection

As with all audio gear, always ensure audio system levels are turned down
or equipment turned off before making connections. This will avoid plug­in or turn-on transients from damaging more sensitive components such as
tweeters.

There are two channels on the DI-BOX2. These are identical and feature
XLR-¼”TRS combo jack INPUT, a ¼” thru-put LINK and a balanced XLR
OUPUT.

Connect your source instrument to the input and the balanced XLR output to
the PA system or recorder. The LINK connector output provides the means
for connecting the signal to a stage amp or personal monitor system. Simply
connect the LINK to your amp or monitor. Unbalanced cables are much more
susceptible to noise than their balanced counterparts. Keeping unbalanced
cables under 8 meters (25’) in length is good practice while balanced cables
can easily extend to 100 meters (300’). The balanced output of the DI-BOX2
is mic level, meaning that it should be connected to the mic input of a mixing
console or mic preamp. Once connected, make sure phantom power is
activated.

Female Male

XLR-TRS Combo input

2 1

Fig-1: XLR Plugs Balanced

For Unbalanced connection, pin-3 should be connected to Ground with pin-1.

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3 3

connection:

1-Ground
2-Signal Hot (+)
3-Signal Cold (-)

2

3-Signal Cold -

Fig-2: XLR-¼"TRS Combo

socket for direct input

1-Ground2-Signal Hot +

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UNiKA DI-BOX2 User Guide

Tip-Signal (+)

Sleeve-Ground

Fig-3: ¼"TS Unbalanced connection Fig-4: ¼"TRS Balanced connection

Tip-Signal Hot (+)

Ring-Signal Cold(-)

Sleeve-Ground

VARIOUS INSTRUMENTS CONNECTION

Fig-5: 2 instruments, Guitar amps & PA connection

Fig-6: Stereo keyboard, Monitors & PA connection

INPUT PAD ATTENUATION

The most common use of the direct input is with guitar pick-ups or keyboards. The
optimal setting for this is most likely with the pad switch set to 0dB, although with
some high-output pick-ups the performance of the direct input may be improved if
the pad switch is set to -20dB to prevent possible clipping of the input signal.

The instrument is connected to the XLR-1/4" Combo jack socket, and a parallel link

feedtakenfromtheotherjacksockettotheinstrument’sownamplier.

The direct input can also be fed either from a line-level output from the head (pad

setto-20dB)orfromtheamplierpoweroutput(speakeroutput,padsetto-40dB).

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UNiKA DI-BOX2

User Guide

ELIMINATING HUM AND BUZZ AND THE GROUND LOOP

The DI-BOX2 is equipped with output isolation transformers to eliminate hum and buzz
caused by stray DC voltage and ground loops.

Computers, optical projectors and other consumer equipment can be particularly noisy,
anyone that has incorporated audio with a projector knows that noise can be a serious
problem, so transformers can be incredibly useful when combating system noise.

A ground lift switch on the outputs takes this one step further by lifting pin-1 on the
XLRs. Computers are often the source for noise problems in audio systems, so greater
care is certainly needed to keep things quiet.

HOW TO REPLACE DI-BOX BATTERY

1

1

2

3

2

Battery installation:

①

Put the battery into the slot. ② Verify the battery polarity is correct and snap it in.

③

Press it down into the battery holder.

1

Battery removal:

1

Press and hold the battery on its bottom end.

2 3

Then pull to lift it up from the battery holder. Lift off the battery.

2

1

3

3

2

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UNiKA DI-BOX2 User Guide

Specicationsaresubjecttochangewithoutnotice.

SPECIFICATIONS

Direct Input Unbalanced, XLR/¼"TRS combo jack.

Link Output Unbalanced, Parallel link output ¼"TRS jack

Direct Input pad At 0dB At -20dB At -40dB

Direct Input Impedance 1MΩ 47KΩ 47KΩ

Max. input level before Clip +9dBu +29dBu +49dBu

Output level Mic level

Output impedance 200Ωnominal,TransformerBalanced.

Analog output Balanced transformer isolated

Frequency response 20Hz to 20KHz , +1/-1 dB

Dynamic range >109dB

(

(Pin-2 Hot, Pin-3&1 Ground).

for feeding to other equipment.

(XLR-M, Pin-1 Ground, Pin-2 Hot, Pin-3 Cold)

)

Noise floor <-90dBu, unweighted 20Hz to 20KHz.

Total harmonic distortion Less than 0.008% at 1KHz, 0dBu output

Ground lift Lifts pin-1 on both XLR outputs

DC Power plug-in 9V battery or +20V to +48V Phantom power

Finish Durable powder coat

Size 158mm (W) x 112mm (D) x 46mm (H)

Weight 1.2Kg, 2.6lbs.

Construction 14 gauge steel cabinet & chassis

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