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www.radialeng.com
®
True to the Music™
BT-PRO™ V2
Bluetooth® Direct Box
User Guide
Radial Engineering Ltd.
1588 Kebet Way, Port Coquitlam
British Columbia, Canada, V3C 5M5
Tel: 604-942-1001 • Fax: 604-942-1010
Email: info@radialeng.com
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Radial® BT-Pro™ V2 User Guide
Table of Contents Page
Overview.......................................................................................1
Features .......................................................................................2
Making Connections ................................................................. 3-4
Bluetooth Pairing ..........................................................................5
Testing and Using ..................................................................... 6-7
Specications ...............................................................................8
Warranty .......................................................................Back cover
Thank you for your purchase of the Radial BT-Pro™! The BT-Pro
is a high-resolution stereo direct box designed to wirelessly pair
with Bluetooth® enabled devices and seamlessly transfer your
music to a pair of balanced audio outputs. This makes it ideal for
connecting mobile devices such as smartphones and tablets to a
mixing console, powered speakers or PA system.
This manual covers the setup and operation of the BT-Pro in
various applications. Please take a few minutes to read it through
in order to familiarize yourself with the BT-Pro features so you
can get the most out of them. If you have any questions that are
not covered in this manual, please consult the FAQ section on
our website. If you still do not nd what you are looking for, feel
free to send us an email at info@radialeng.com and we will do
our very best to reply in short order.
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True to the Music
®
Radial Engineering Ltd.
BT-Pro™ Bluetooth DI
OVERVIEW
A typical direct box is a device that lets you interface an unbalanced audio
output with a professional balanced input, such as those commonly found
on a PA or recording system. The Radial BT-Pro is similar in that it pairs
with a Bluetooth enabled transmit device and converts the streamed
digital signal to balanced stereo analog outputs for connection to any pro
audio device.
Once it is paired with your streaming device, the BT-Pro’s internal antenna
picks up the streaming audio and converts it to an analog signal. A level
control allows you to adjust the output level and a mono sum switch can
be activated to reduce channel count requirements at your mixer or to
check for phase issues. The 3.5mm headphone output can be used to
monitor the stereo signal and test for audio prior to connecting to the PA.
At the XLR outputs, the left and right signals are balanced to drive long
cables without noise, and a ground lift is provided to eliminate hum and
buzz caused by ground loops.
A front-panel level control is used to adjust the volume of the XLR and
headphone outputs. This is variable from a mic-level output to feed a
traditional mixing channel preamp input, or it can be turned up to a linelevel signal to feed the line input on a mixing console, recording system
or powered speaker. The BT-Pro ensures the audio signal is delivered to
the PA as faithfully as possible.
The BT-Pro is easy to setup and use. Once it is powered up by plugging
into the external power supply (included) or by providing 48V phantom
power to the XLR outputs, it will automatically appear as an available
audio destination on your Bluetooth-enabled mobile device — providing
you with a high quality wireless audio link to your sound system.
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Radial Engineering Ltd.
BT-Pro™ Bluetooth DI
True to the Music
®
FEATURES
5 81 2 3 6 7
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1. LEVEL: Used to set the overall output volume at the XLR and
headphone outputs.
2. MONO: Sums the stereo signal to mono. When active, the LED
indicator illuminates. Mono mode allows you to reduce the channel
count on the PA or send identical mono signals to two separate
audio systems simultaneously.
3. HEADPHONE: Mini 3.5mm stereo (1/8”) TRS headphone output is
used to check the output from the source for troubleshooting.
4. PAIR/RESET: Press and hold the PAIR button for three seconds to
disconnect from any Bluetooth devices and force the BT-Pro into
pairing mode. Press the recessed RESET switch to power-cycle
the BT-Pro. The red/yellow PAIR LED indicates the pairing and
playback status of the BT-Pro.
5. POWER INPUT/USB: Used to locally power the BT-Pro. Connect
the included USB Type-C cable to a computer or a USB wall charger
(included). This is a power input only that will not pass audio or other
data.
6. XLR OUT: Standard XLR male outputs provide balanced audio
outputs to connect to a PA system. The BT-Pro can be powered
remotely by providing 48V phantom power to these outputs.
7. GROUND LIFT: Used to help eliminate hum and buzz caused by
ground loops. Lifts pin-1 on both XLR outputs.
8. PLASTIC INSERT: The BT-Pro combines a 14 gauge steel outer
shell with an injection-molded plastic insert which allows wireless
signals to pass though unimpeded, enhancing the eective range
of the device while ensuring it handles the stresses of nightly use
on tour.
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True to the Music
®
Radial Engineering Ltd.
BT-Pro™ Bluetooth DI
MAKING CONNECTIONS
Before making any audio connections to the BT-Pro, always ensure your
audio system is either turned down or turned o in order to protect more
sensitive components from damage caused by loud turn-on or plug-in
transients.
POWERING THE BT-PRO
The BT-Pro uses a USB Type-C connector and cable for its power
requirements. Use the included ‘USB-C to USB-A’ cable and connect to a
computer, USB hub or the included USB wall charger. You may also use
any standard USB wall charger that is included with most phones and
tablets, as the BT-Pro will only draw a small amount of current.
TYPE-C USB
Powering the BT-Pro using the included supply
TYPE-A USB
Alternatively, when connected to microphone inputs, the BT-Pro can
be operated using 48V phantom power - which is available on the vast
majority of mixing consoles and recording interfaces. Simply engage
phantom power on both channels that are connected to the XLR outputs
of the BT-Pro, then press the PAIR button. The PAIR LED will illuminate to
indicate that the BT-Pro is receiving power and ready for use.
Power
Audio
48V
Powering the BT-Pro using 48V phantom power
Both methods of powering the BT-Pro can be used simultaneously,
providing redundant power sources that will allow the BT-Pro to continue
working even if one source fails.
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Radial Engineering Ltd.
BT-Pro™ Bluetooth DI
True to the Music
®
CONNECTING TO THE AUDIO SYSTEM
Connecting the BT-Pro to your audio system is done using two XLR
cables. These XLRs can be connected to mic or line level inputs,
depending on the setting on the BT-Pro LEVEL control.
NOTE: The BT-Pro is capable of producing line-level signals, which
can easily overload the inputs of a microphone preamplier. Always
start with the LEVEL control turned all the way down before testing
playback. When connecting to mic inputs on your console or interface
it is normal to have the BT-Pro LEVEL control set between 9 o’clock
and 12 o’clock.
Right
Left
Audio connections for PA system and recording systems
use balanced XLR cables up to 100 meters (300’).
Once you make these connections, turn up the audio system. It is good
practice to always test at a low volume. Should you encounter hum or
buzz due to a ground loop, engage the Ground Lift switch to help alleviate
the problem.
Headphone output
It is important to note that there is a very loud
headphone output built into the BT-Pro that enables
professional grade, low sensitivity headphones to be
used. Make sure you always set the level completely
o (fully counter-clockwise) before using.
Adjusting the level control on the BT-Pro will aect both the XLR and
headphone output. The intended use of the headphone output is for
testing purposes to ensure that signal is being properly received by
the BT-Pro. If you do not hear sound in the PA, signal presence at the
headphone output lets you know that the problem is likely not the BT-Pro
but may be another connection or that a piece of equipment needs to be
checked.
Headphone Safety Warning
Caution: Very Loud Amplier
As with all products capable of producing high Sound Pressure Levels (SPL) users
must be very careful to avoid the hearing damage that may occur from prolonged
exposure. This is particularly important as it applies to headphones. Prolonged
listening at high SPLs will eventually cause tinnitus and can lead to partial or
complete loss of hearing. The user agrees that Radial Engineering Ltd. remains
harmless from any health eects resulting from the use of this product and the user
clearly understands that he or she is entirely responsible for the safe and proper use
of this product. Please consult the Radial Limited Warranty for further details.
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True to the Music
®
Radial Engineering Ltd.
BT-Pro™ Bluetooth DI
BLUETOOTH PAIRING
Once the BT-Pro is connected to a power supply, the PAIR LED will ash
red, then begin to alternate between red and yellow. At this point the
BT-Pro will be available to pair with Bluetooth devices. Check the
available devices on your Bluetooth enabled playback source; the
BT-Pro should appear in the list as ‘Radial-XXXXXX’, where the last
6 digits will be the unique identier for the BT-Pro. After selecting the
BT-Pro, your plackback device should prompt you for a password. The
password is 1246. Once initially paired, the BT-Pro automatically converts
the streaming audio to analog for connection to a variety of systems.
Your device should automatically reconnect on future sessions, as your
smartphone does in your car.
1. Make sure the BT-Pro volume control is
turned fully counter clockwise.
2. Enable Bluetooth pairing on your
Bluetooth enabled device.
3. Connect your BT-Pro to power; the
PAIR LED will turn red to indicate that it
is receiving power.
4. The PAIR LED will then alternate
between red and yellow showing the
The Pairing LED on the BT-Pro
BT-Pro is in search mode for pairing.
5. Your Bluetooth device will identify the
BT-Pro as ‘Radial-XXXXXX’ in the
Bluetooth devices menu.
6. Select the BT-Pro in your Bluetooth
devices menu.
7. Your Bluetooth device will then ask for
a rst time password for the BT-Pro.
Type in: 1246.
8. Once your Bluetooth device has paired
with the BT-Pro, the PAIR LED will ash
once every two seconds. When audio
is playing, the PAIR LED will ash three
times quickly every three seconds.
Once your Bluetooth device has been paired to the BT-Pro, the BT-Pro
will automatically pair to the same Bluetooth device when the BT-Pro is
turned back on and in range.
NOTE: You can also use the PAIR button on the BT-Pro to control
audio playback on your wireless device. Quickly double-tap this button
to pause or resume audio playback without interrupting the wireless
connection to your Bluetooth device.
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Radial Engineering Ltd.
BT-Pro™ Bluetooth DI
True to the Music
®
Going out of range
If your Bluetooth device goes out of the range of your BT-Pro (greater
than 30 meters), the device playback will pause and the PAIR LED on
the BT-Pro will slowly blink red to show the unit is in ‘Standby’ mode.
Once the device is back in range, the BT-Pro will automatically reconnect
to continue playing back audio from your Bluetooth device. Standby
mode will not allow another Bluetooth device to pair with the BT-Pro. If
your Bluetooth device goes out of range from the BT-Pro for more than
two minutes, or if you want to connect a dierent Bluetooth device for
playback, you can hold the PAIR button for three seconds to put the
BT-Pro back into pairing mode.
The BT-Pro allows for reception distances of up to 30 meters (100’),
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 BT-Pro and your Bluetooth device. You can also
adjust the angle and placement of the BT-Pro, as this may also aect the
reception.
NOTE: 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 BT-Pro’s LEVEL control to the 7 o’clock (o) position. This
will allow you to adjust the output level on the y. Next, check the status
of the MONO SUM switch and LED indicator. For stereo, set the switch to
the outward position (LED o). For dual mono operation, set the switch to
the inward position (LED on).
It’s a good idea to start testing the Bluetooth audio with a sound le 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 BT-Pro to operate
at the lowest noise oor. Keep in mind that various media les will play
back at dierent volume levels depending on your software and how the
sound le was recorded.
Slowly raise the output level of the BT-Pro. 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.
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True to the Music
®
Radial Engineering Ltd.
BT-Pro™ Bluetooth DI
Using Multiple BT-Pro’s in one location
Some applications require the use of multiple BT-Pro’s within close
proximity, such as a dance studio with multiple rooms. The BT-Pro
makes this easy, as each unit has its own unique identier visible in your
available bluetooth device menu.
For example, three dierent BT-Pro’s might show up as Radial-100001,
Radial-100002 and Radial-100003 when powered up within range of your
bluetooth device. Upon initial setup, power each BT-Pro on individually
and note the six-digit identier; you can mark this on the unit itself or in
the location where it will be installed, providing an easy reference.
Room A
Radial-100001
Room B
Radial-100002
Room C
Radial-100003
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Radial Engineering Ltd.
BT-Pro™ Bluetooth DI
True to the Music
®
SPECIFICATIONS*
Audio Circuit Type: ...........................................Bluetooth A2DP receiver with audio line drive
Bluetooth Compliance: ......................................Bluetooth 5.0
Data Compression: ...........................................SBC Codec
Compatibility: .....................................................All Bluetooth A2DP compliant devices
Device Range: ...................................................≥30m (100’) Typical: line-of-sight
Frequency Response: .......................................20Hz to 20KHz
Dynamic Range: ...............................................90dB
Signal to Noise: .................................................90dB
Maximum Gain: ................................................+4dBu (source le dependent)
Total Harmonic Distortion: ................................0.05%
Output Impedance: ...........................................150Ω
Features
Audio Output: ....................................................2x Balanced XLR-M
Headphone Output: ..........................................3.5mm TRS
Level Control: ....................................................Variable, works on headphone and XLR
Mono Switch: ....................................................Sums Left and Right Channels
Ground Lift: .......................................................Lifts pin 1 on both XLR Outputs
General
Construction: ....................................................14 gauge steel outer shell, molded nylon insert
Finish: ................................................................Durable powder coat
Size: (W x H x D) ...............................................3.3” X 5” X 2” (84 x 127 x 51mm)
Weight: .............................................................1.1lbs (500g)
Power: ...............................................................USB-C connector (Power Only) or 48V Phantom
Warranty: ..........................................................Radial 3-year, transferable
* Subject to change without notice.
* Subject to change without notice.
FCC IDENTIFIER: 2AJYKTS-BT35A01
This device complies with Part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation
The BT-Pro contains Digital devices that are susceptible to Electrostatic
Discharge (ESD), precautions should be observed for optimal system
performance.
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True to the Music
®
Radial Engineering Ltd.
BT-Pro™ Bluetooth DI
NOTES:
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THREE YEAR TRANSFERABLE LIMITED WARRANTY
RADIAL ENGINEERING LTD. (“Radial”) warrants this product to be free from defects in
material and workmanship and will remedy any such defects free of charge according
to the terms of this warranty. Radial will repair or replace (at its option) any defective
component(s) of this product (excluding nish and wear and tear on components under
normal use) for a period of three (3) years from the original date of purchase. In the event
that a particular product is no longer available, Radial reserves the right to replace the
product with a similar product of equal or greater value. In the unlikely event that a defect
is uncovered, please call 604-942-1001 or email service@radialeng.com to obtain an
RA number (Return Authorization number) before the 3 year warranty period expires.
The product must be returned prepaid in the original shipping container (or equivalent)
to Radial or to an authorized Radial repair centre and you must assume the risk of loss
or damage. A copy of the original invoice showing date of purchase and the dealer name
must accompany any request for work to be performed under this limited and transferable
warranty. This warranty shall not apply if the product has been damaged due to abuse,
misuse, misapplication, accident or as a result of service or modication by any other than
an authorized Radial repair center.
THERE ARE NO EXPRESSED WARRANTIES OTHER THAN THOSE ON THE FACE
HEREOF AND DESCRIBED ABOVE. NO WARRANTIES WHETHER EXPRESSED
OR IMPLIED, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL EXTEND
BEYOND THE RESPECTIVE WARRANTY PERIOD DESCRIBED ABOVE OF THREE
YEARS. RADIAL SHALL NOT BE RESPONSIBLE OR LIABLE FOR ANY SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSS ARISING FROM THE USE
OF THIS PRODUCT. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND
YOU MAY ALSO HAVE OTHER RIGHTS, WHICH MAY VARY DEPENDING ON WHERE
YOU LIVE AND WHERE THE PRODUCT WAS PURCHASED.
To meet the requirements of California Proposition 65, it is our responsibility to inform you of the following:
WARNING: This product contains chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm.
Please take proper care when handling and consult local government regulations before discarding.
®
www.radialeng.com
Radial Engineering Ltd.
1588 Kebet Way, Port Coquitlam, British Columbia, V3C 5M5
Tel: 604-942-1001 • Fax: 604-942-1010 • Email: info@radialeng.com
Radial® BT-Pro™ User Guide - Part #: R870 1067 00 / 01-2020
Copyright 2020 Radial Engineering Ltd. All rights reserved.
Specications and appearance subject to change without notice.
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