DI-BT
01 Overview
02 Features
03 Audio Connection
05 USB Mini-B Connection
05 Instrument Direct Input &
Parallel Link Connection
06 Eliminating hum and buzz
06 Using the headphone output
07 Bluetooth Pairing
08 Going Out of Range
09 Testing and Using
09 Specications
Index
USER GUIDE
6F, No.168, Xin-Hu 2nd Rd.
Nei-Hu District, Taipei City. 11494.
Taiwan, Republic of China.
+886 2 27933017
+886 2 27928264
unika@unika.com.tw
Unika Electronic Co., Ltd.
www.unika.com.tw
Box Series
Made in Taiwan
UNiKA DI-BT User Guide
1
OVERVIEW
The DI-BT Box is a high-resolution stereo direct box designed to wirelessly
pair with Bluetooth® enabled devices and seamlessly transfer the streaming
audio to a pair of balanced audio outputs. This makes it ideal for connecting
a laptop, cell phone or tablet to a mixing console, powered speakers or PA
system.
The DI-BT Box antenna first picks up the streamed digital audio signal and
converts to analog audio and feeds directly into the direct box circuit to
produce Low-Z balanced left and right stereo signals. A front-panel level
control is used to adjust the output volume along with the volume setting for
the headphones. This is variable from a mic level output to feed a traditional
mixing channel preamp input to a line level to feed the line input on a mixing
console, recording system or powered speaker. The 3.5mm mini-headphone
output can be used to monitor the stereo signal and test for audio prior to
connecting to the PA. The XLR output isolation transformers will help to
eliminate noise caused by ground loops. The signal is then balanced to drive
long cables without noise.
The DI-BT Box is easy to setup and use. Once it is powered up and the ON
switch is engaged, it will automatically appear as an available device on
your Bluetooth enabled computer, tablet or smart phone.
We recommend that you read carefully through the manual in order to
familiarize yourself with the DI-BT Box features so you can get the most out
of it.
unika@unika.com.tw
If you still need further clarification, please send email to us and we will
do our very best to reply in short order.
UNiKA DI-BT User Guide
2
The DI-BT Box is a high-resolution stereo direct box designed to wirelessly
pair with Bluetooth® enabled devices, once it is powered up, it will
automatically be listed as an available device on your Bluetooth enabled
computer, tablet or smart phone.
A professional Hi-Z direct input is also equipped, this is most commonly used
with guitar pickups or keyboards, it also can be fed either from a line-level
output from the head (pad set to -20dB) or from the amplier power output .
A stereo pair of balanced XLR audio outputs with adjustable level control then
feeds the signal to a microphone preamplier, PA system, mixing console or
even a powered speaker!
The transferred Bluetooth Streaming audio can be monitored on headphones
through the 3.5mm analog output jack to check signal quality and level before
connecting to a sound system. Two isolated output transformers are equipped
to eliminate any hum or buzz caused by ground loops. To further reduce
susceptibility to noise, this is augmented with a ground lift switch that lifts pin1 on both XLR jacks.
FEATURES
• Stereo Bluetooth-Direct Box.
• High impedance direct input for electronic musical instrument signal feed.
• USB type-B Mini port, connect to computer for 5V supply.
• 3.5mm TRS headphone output for audio level monitoring.
• Front panel Level control used for stereo output along with headphone
volume adjustment.
• The direct input audio signal will mix to the Bluetooth stereo audio signal
at the output stage.
• A Mono-Sum switch to mix the left and right channel signals to form a
monaural signal in both output channel.
• Selectable 3 steps attenuator for Hi-Z direct input.
• Accept power from 9V battery or 5V from computer USB.
• 2 channel XLR Balanced Low-Z output with isolation transformer.
UNiKA DI-BT User Guide
3
AUDIO CONNECTION
Audio connection of the DI-BT Box
DI Input
Bluetooth RF
USB Input
Link Output
Headphone Output
Stereo Outputs
⑨ ⑩ ⑪⑫
⑬
⑭
① ② ③ ④ ⑤ ⑦ ⑧⑥
UNiKA DI-BT User Guide
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①
¼" TRS Link output socket,
internally parallel wired to the
input.
②
Input:
XLR-¼" TRS Combo jack,
unbalanced Hi-Z input used to
connect instruments.
③
Input PAD:
0dB, -20dB & -40dB selectable 3
steps attenuator reduces the input
sensitivity to prevent overload.
④
LEVEL Control:
Used to set the overall output
level also the headphone output
level changes simultaneously.
⑤
HEADPHONE:
Mini 3.5mm (1/8") TRS
headphone output is used to
check the output from the
Bluetooth audio source for
trouble shooting.
Works with ear-buds and
standard headphones.
⑥
USB-B Mini Port:
Connects from the PC or Mac
using a USB type B-mini cable.
This port delivers only the
power
to the DI-BT Box without any
audio data.
⑦
Mono Sum switch:
When the switch is depressed,
the left and right channel signal
will be mixed to form a monaural
signal in both output channels.
⑧
Mono Sum indicator:
The LED light up show that the
Mono-Sum mode is in use.
⑨
GROUND LIFT:
Used to help eliminate hum and
buzz caused by ground loops,
lifts pin-1 on both
XLR output
connectors.
⑩
2 CHANNEL OUTPUTS:
2 channel transformer balanced
outputs, XLR-3 male connector,
pin layout
follows the AES format.
⑪
POWER switch:
Used to switch the power ON/OFF.
⑫
POWER ON/OFF LED indicator.
⑬
Reset switch:
Turn the RESET switch to the
ON position and the DI-BT Box
will be available to pair with
Bluetooth devices.
⑭
The Red and Blue LEDs will
alternate indicate that the DI-BT
is in search mode for pairing.
UNiKA DI-BT User Guide
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USB Mini-B Connection
The DI-BT Box uses a USB Mini-B connector and cable for its power
requirements. Use the ‘Mini-B to TYPE A’ USB cable and connect to a
computer, USB hub or the USB wall charger. You may also use any standard
USB wall charger that is included with most phones and tablets, as the DI-
BT Box will only draw a small amount of current.
Instrument direct input & Parallel link connection
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 instruments’ own
amplifier.
The direct input can also be fed either from a line-level output from the head
(pad set to -20dB) or from the amplifier power output (speaker output, pad
set to -40dB).
USB wall charger
USB type-A fits all laptop
USB type Mini-B connect to the DI-BT
UNiKA DI-BT User Guide
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Eliminating hum and buzz
The Unika DI-BT Box is equipped with 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 pin1 on the XLRs. Computers are often the source for noise problems in audio
systems, so greater care is certainly needed to keep things quiet.
Using the headphone output
The DI-BT Box is also equipped with a stereo headphone output. This
headphone amplifier is controlled by the master output level control, and is
designed to be used to check signal before plugging into a PA system.
Adjusting the level control on the DI-BT Box will affect both the XLR and the
headphone output.
The 3.5mm (1/8") output is designed for both ear buds and standard TRS
stereo headphones where tip-left, ring-right and the sleeve is ground.
Be careful! If you push the level too hard it may distort or cause hearing
damage! The DI-BT Box is intended for use by professional audio
engineers who are aware of the importance of listening at safe levels.
This same audio level control sets the output going to your PA or recording
system. Once you have determined that the signal from the computer is OK,
reset the level to 7 o'clock. Plug the XLR outputs to your audio system using
standard balanced mic cables. Turn on the audio system, bring up the level
and then turn up the level on the DI-BT Box.
UNiKA DI-BT User Guide
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Bluetooth Pairing
Once the DI-BT Box is power ON, 2 LEDs on the top of the unit will illuminate,
at this point you can turn the RESET switch to the ON position and the DI-BT
Box will be available to pair with Bluetooth devices, check the available devices on your Bluetooth enabled playback source; the DI-BT Box should appear
in the list, select the DI-BT Box, your playback device will be paired and the
DI-BT Box automatically converts the streaming audio to analog for connection to audio systems.
1. Make sure the DI-BT Box volume control is turned fully counter clockwise.
2. Enable Bluetooth pairing on your Bluetooth enabled device.
3. Connect your DI-BT Box to USB power and turn ON the unit.
4. Turn on the DI-BT Box RESET switch to enable Bluetooth pairing.
5. Red and Blue LED’s will alternate showing the DI-BT Box is in search
mode for pairing.
6. Your Bluetooth device will identify the DI-BT Box in the Bluetooth devices menu.
7. Select the DI-BT Box in your Bluetooth devices menu.
8. Once your Bluetooth device has paired with the DI-BT Box, the blue LED
will light up constantly, when audio is playing, the blue LED will flash
every three seconds.
9. Once your Bluetooth device has been paired to the DI-BT Box, the DI-BT
Box will automatically pair to the same Bluetooth device when the DI-BT
Box is turned back on in range.
Going out of range
If your Bluetooth device goes out of the range of your DI-BT Box (greater than
10 meters), the device playback will pause and the blue LED on the DI-BT Box
will stop flashing to show the unit is in ‘Stand-by’ mode. Once the device is
back in range, the DI-BT Box will automatically reconnect to continue playing
back audio from your Bluetooth device. Stand-by mode will not allow another
Bluetooth device to pair with the DI-BT Box. If your Bluetooth device goes out of
range from the DI-BT Box for more than two minutes, or if you want to connect
UNiKA DI-BT User Guide
8
a different Bluetooth device for playback, you will need to reset the DI-BT Box.
This is done by turning the RESET switch off and back to on.
The DI-BT Box allows for reception distances of up to 10 meters (33’), which
can be signicantly extended under ideal conditions. Should you experience
interference or signal dropouts, ensure that there is a clear line of sight
between the DI-BT Box and your Bluetooth device. You can also adjust the
angle and placement of the DI-BT Box, as this may also affect the reception.
If you’re using a computer with a USB Bluetooth dongle, some
pairing features may not be automatically available.
Please refer to your dongle’s software manual for instructions on
how to activate these features.
Testing and Using
First, set the DI-BT Box’s LEVEL control to the 7 o’clock (off) position. This
will allow you to adjust the output level on the y.
It’s a good idea to start testing the Bluetooth audio with a sound file you
are familiar with. Set your source’s output level and the level of the media
playback software (if applicable) at 80% or higher for optimal signal to noise.
A higher volume from the source will allow the DI-BT Box to operate at the
lowest noise floor. Keep in mind that various media files will playback at
different volume levels depending on your software and how the sound file
was recorded.
Slowly raise the output level of the DI-BT Box. It is good practice to always
test at a low volume to ensure proper connections have been made and
all devices in the signal chain are set up correctly and working. This way,
should a device not be turned on or a connection not fully made, it will not
create a loud transient ‘pop’ in the PA that could damage a tweeter or annoy
your audience. When satised, slowly increase the input gain on your mixing
console until you reach an appropriate level.
UNiKA DI-BT User Guide
9
SPECIFICATIONS
(Specications are subject to change without notice.
)
Audio Circuit Design Bluetooth A2DP transceiver with audio line drive
Standard Bluetooth V4.2 Standard
HOW TO REPLACE DI-BOX BATTERY
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.
Battery removal:
Press and hold the battery on its bottom end.
Then pull to lift it up from the battery holder.
Lift off the battery.
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UNiKA DI-BT User Guide
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Dynamic range >90dB
Noise <-90dBu, unweighted 20Hz to 20KHz.
Maximum output +9dBu. (source file dependency)
Total harmonic distortion Less than 0.008% at 1KHz, 0dBu output
Hi-Z Direct Input Unbalanced, XLR/¼"TRS combo jack.
(Pin-2 Hot, Pin-3&1 Ground).
Link Output Unbalanced, Parallel link output ¼"TRS jack for
feeding to other equipment.
Direct Input Attenuator At 0dB At -20dB At -40dB
Direct Input Impedance 1 MΩ 47KΩ 47KΩ
Max. input level before Clip +9dBu +29dBu +49dBu
Output impedance 200Ω nominal, Transformer Balanced.
Analog output Balanced transformer isolated
( XLR-M, Pin-1 Ground, Pin-2 Hot, Pin-3 Cold)
Headphone output 3.5mm TRS,
(Tip-Left Ch. Ring-Right Ch., Sleeve-Ground)
Level control Variable, works on headphone and XLR outputs
Ground lift Lifts pin-1 on both XLR outputs
DC Power derives power from USB, plug-in 9V battery
Finish Durable powder coat
Size 158mm (W) x 112mm (D) x 46mm (H)
Weight 1.2Kg, 2.6lbs.
Construction 14 gauge steel cabinet & chassis
Device Operating Range 10m (line of sight)
Frequency response 20Hz to 20KHz , +1/-1 dB
Compatibility All Bluetooth A2DP compliant devices
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