Radial Bt-pro User Manual

®

True to the Music™

™

BT-PRO

Bluetooth® Direct Box

User Guide

Radial Engineering Ltd.
1588 Kebet Way, Port Coquitlam
British Columbia, Canada, V3C 5M5
Tel: [phone] • Fax: [phone]
Email: [e-mail]

www.radialeng.com

Headphone Safety Warning

Caution: Very Loud Amplier

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. Please be aware of the recommended exposure limits
within your legal jurisdiction and follow them very closely. The user agrees that Radial
Engineering Ltd. remains harmless from any health effects 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.

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.

Radial® BT-Pro™ User Guide

Table of Contents Page

Features .......................................................................................1

Overview.......................................................................................2

Making Connections ................................................................. 3-4

Bluetooth Pairing ..........................................................................5

Testing and Using .........................................................................6

Block Diagram ..............................................................................7

Specications ...............................................................................8

Warranty .......................................................................Back cover

Congratulations on 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 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.

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. This is also where we post the latest updates. If you

still do not nd what you are looking for, feel free to send us an

email at [e-mail] and we will do our very best to reply
in short order.

®

True to the Music

FEATURES

1 2 3 4 5 6 7

1. LEVEL: Used to set the overall output level.

2. MONO: Sums the stereo signal to mono. When active, the LED

indicator illuminates. Mono mode reduces the channel count on
the PA or lets you send the signal 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 trouble shooting. Works
with ear buds and standard headphones.

4. POWER INPUT/USB: Used to power the BT-Pro. Connect the
included USB Mini-B cable to a computer or wall power supply. This
is a power input only that will not pass audio or other data.

5. XLR OUT: Standard XLR male outputs follow AES format with pin-1
(ground), pin-2 (+) and pin-3 (-).

6. GROUND LIFT: Used to help eliminate hum and buzz caused by
ground loops. Lifts pin-1 on both XLR outputs.

7. RIGHT-ISO/LEFT-ISO: Switches on side panel let you insert
transformer isolation when needed on each channel. Used to
eliminate hum and buzz caused by ground loops.

8. COVER: Blue Sintra® cover protects the internal antenna while
allowing the wireless signal to pass through without interference.

9. LED PAIRING INDICATORS: Red
and blue LED’s toggle back and
forth during pairing to provide visual
feedback of the wireless Bluetooth
connection status.

10. RESET/ON: Recessed switch on
side panel used to reset the BT-Pro
for pairing with another device.

Radial Engineering Ltd.

1

8 9 10

BT-Pro™ Bluetooth DI

®

True to the Music

OVERVIEW

A typical direct box is a device that lets you interface an unbalanced (hi­Z) audio output with a professional balanced (low-Z) input as found on a
PA or recording system. The Radial BT-Pro is similar in that it pairs with
a Bluetooth enabled device and converts the streamed digital signal to
analog balanced stereo output.

The BT-Pro’s antenna rst picks up the streaming audio and converts

it to analog audio. A level control allows you to adjust the output level
and a mono sum switch can be activated to send the mono signal to two
separate audio systems or used to check for phase issues. The 3.5mm
mini-headphone output can be used to monitor the stereo signal and test
for audio prior to connecting to the PA. Before the XLR output, isolation
transformers may be switched into the circuit to eliminate noise caused
by ground loops. The signal is then balanced to drive long cables without
noise.

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 BT-Pro ensures the digital signal is delivered to the PA as
faithfully as possible.

The BT-Pro 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.

Radial Engineering Ltd.

2

BT-Pro™ Bluetooth DI

®

True to the Music

MAKING CONNECTIONS

Before making any connections, always ensure your audio system is either
turned down or turned off in order to protect more sensitive components
from damage caused by loud turn-on or plug-in transients. The BT-Pro
uses a USB Mini-B connector and cable for its power requirements. Use
the included ‘Mini-B to TYPE A’ USB 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 A USB

Fits most laptops and computers

TYPE Mini-B USB

Used to connect to the BT-Pro

BE SURE THAT THE BT-PRO IS TURNED OFF BEFORE CONNECTING
THE POWER CABLE to avoid initial intermittent power spikes to the
electronics.

OFFON

IMPORTANT NOTE: Feeding 48V phantom power to the BT-Pro can

damage the unit if the protective transformers are not inserted into the
signal path. Ensure that you turn off phantom power for the channels
connected to the BT-Pro. If only a global phantom power switch is
present, then make sure the transformers are inserted!

To block DC current, activate the
transformer isolation by switching
the LEFT-ISO and RIGHT-ISO to
the ‘right’ position.

Radial Engineering Ltd.

3

BT-Pro™ Bluetooth DI

®

True to the Music

Connecting the BT-Pro to your audio system is done using two XLR
cables. This follows the AES standard with pin-1 (ground), pin-2 (+) and
pin-3 (-). These XLRs can be connected to mic or line level inputs.

Right

Left

Audio connections for PA system and recording systems

use balanced XLR cables up to 100 meters (300’).

Once you make the connections, turn up the audio system. It is good
practice to always test at a low volume. Due to the analog circuitry in the
BT-Pro, it is susceptible to interference in environments that may have
high levels of ambient RF energy. To remedy this situation both of the ISO
switches may be set to ON (right) and the Ground Lift switch set to LIFT
(in). This will reduce the level of interference, but in some cases may not
totally eliminate the issue.

Headphone Safety Warning

Caution: Very Loud Amplier

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 off (fully
counter-clockwise) before using. Adjusting the level control on the BT­Pro will affect both the XLR and headphone output. The headphone amp
is not actually intended for listening – it is for testing to ensure the signal
is being processed by the BT-Pro and being properly sent to the output
by the DAC (digital to analog converter). If you do not hear sound in the
PA, this lets you know that the problem is likely not the BT-Pro but maybe
another connection or that a piece of equipment needs to be checked.

Radial Engineering Ltd.

4

BT-Pro™ Bluetooth DI

®

True to the Music

BLUETOOTH PAIRING

Once the BT-Pro is connected to a power supply, a blue LED on the
top of the unit will illuminate. At this point you can turn the RESET/
ON switch to the ON position and 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
Eng’. Once you select the BT-Pro, your plackback device should prompt
you for a password. The password is 1246. Once initially paired, the BT­Pro 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; a blue

LED on the top of the unit will indicate
that it is receiving power.

4. Turn on the BT-Pro to enable Bluetooth

pairing.

5. Blue and red LED’s will alternate

showing the BT-Pro is in search mode
for pairing.

6. Your Bluetooth device will identify the

BT-Pro as ‘Radial Eng’ in the Bluetooth
devices menu.

7. Select the BT-Pro in your Bluetooth

devices menu.

8. Your Bluetooth device will then ask for

a rst time password for the BT-Pro.

Type in: 1246.

9. Once your Bluetooth device has paired

with the BT-Pro, the blue LED will ash

once every three seconds. When audio

is playing, the blue 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 in range.

Radial Engineering Ltd.

5

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 12 meters), the device playback will pause and the blue LED on
the BT-Pro will slowly blink to show the unit is in ‘Stand-by’ mode. Once
the device is back in range, the BT-Pro 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 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 different Bluetooth device for
playback, you will need to reset the BT-Pro. This is done by turning the
RESET/ON switch off and back to on.

The BT-Pro allows for reception distances of up to 12 meters (40’),

which can be signicantly 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 affect 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 (off) 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 off). 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 different 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 satised, slowly increase the input gain on

your mixing console until you reach an appropriate level.

Radial Engineering Ltd.

6

BT-Pro™ Bluetooth DI

®

BLOCK DIAGRAM*

True to the Music

CHASSIS_GND

GROUND LIFT

LEFT

OUTPUT

RIGHT

OUTPUT

HEADPHONE OUTPUT

TRANSFORMER FULL BYPASS SWITCHES

* Subject to change without notice.

Radial Engineering Ltd.

H/P

AMPLIFIER

PHASE

/BUFFER

SPLITTER

FILTER

PHASE

/BUFFER

SPLITTER

FILTER

MONO

LEVEL

OUTPUT

R_OUT

L_OUT

BLUE

TOOTH

RECEIVER

7

BT-Pro™ Bluetooth DI

®

True to the Music

SPECIFICATIONS*

Audio Circuit Type: ...........................................Bluetooth A2DP transceiver with audio line drive

Bluetooth Compliance: ......................................Bluetooth 2.0 W/EDR

Data Compression: ...........................................SBC Codec

Compatibility: .....................................................All Bluetooth A2DP compliant devices

Device Range: ...................................................12m (40’) (line of sight)

Frequency Response: .......................................20Hz to 20KHz

Dynamic Range: ...............................................90dB

Signal to Noise: .................................................90dB

Maximum Gain: ................................................+8dBu (source le dependant)

Total Harmonic Distortion: ................................0.01%

Output Impedance: ...........................................300Ω

Features

Audio Output: ....................................................2x Balanced AES Standard XLR-M

Headphone Output: ..........................................3.5mm TRS

Level Control: ....................................................Variable, works on headphone and XLR

Transformer Isolation: .......................................Independent for each channel

Mono Switch: ....................................................Sums Left and Right Channels

Ground Lift: .......................................................Lifts pin 1 on both XLR Outputs

General

Construction: ....................................................14 gauge steel chassis & outer shell

Finish: ................................................................Durable powder coat

Size: (W x H x D) ...............................................3.3” X 5” X 2” (84 x 127 x 51mm)

Weight: .............................................................1.5lbs (6.8Kg)

Power: ...............................................................USB Mini connector (Power Only)

Warranty: ..........................................................Radial 3-year, transferable

* Subject to change without notice.

Radial Engineering Ltd.

8

BT-Pro™ Bluetooth DI

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 [e-mail] 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 modication 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: [phone] • Fax: [phone] • Email: [e-mail]

Radial® BT-Pro™ User Guide - Part #: R870 1008 00 / 03-2017

Copyright 2017 Radial Engineering Ltd. All rights reserved.
Specications and appearance subject to change without notice.