Radial Engineering SB-48UB User Manual - page 2
INTRODUCTION
Thank you and congratulations on your purchase of the Radial
StageBug SB-48UB hi-Z to lo-Z signal converter and phantom power
supply. The StageBug SB-48UB is a unique device that makes it easy
to interface phantom powered microphones and direct boxes with
guitar-centric boxes of all types.
As most users will likely be familiar with the use of phantom power,
this manual has been kept short and to the point. We do however
suggest that you take a moment to give it a quick read so that you
familiarize yourself with the features that are built into the SB-48UB.
For more detailed information, please visit the FAQ section on the
Radial website. This is where we post questions and answers that
come from users after the product is released. If you do not fi nd an
answer, we invite you to send us an email at info@radialeng.com and
we will do our best to answer your query in short order.
The SB-48UB features a balanced microphone input with 48V phan-
tom to power a condenser microphone. What makes it unique is that
it is equipped with both balanced XLR and unbalanced 1/4” outputs.
The unbalanced ¼” output enables the artist to connect a condenser
microphone directly to devices that do not supply phantom power
such as the Radial PZ-Pre instrument preamp, a guitar effects pedal,
or a stage amplifi er. Since both outputs may be used concurrently,
you can also send the dry mic signal directly to the PA system using
the XLR output.
GETTING SET
Before connecting the StageBug SB-48UB make sure the sound system and/or
stage amplifi er is turned off and all levels are set to zero. This will avoid loud tran-
sients caused by the phantom voltage that could damage equipment downstream
such as loudspeakers and tweeters. Do not turn up the volume until all connections
are made and the power supply is plugged in.
There is no power switch. As soon as you plug in the power supply, the SB-48UB
will spring to life and the front panel LED will illuminate. As an added safety feature,
the SB-48UB is equipped with a locking cable clamp that lets you secure the power
supply cable so that it will not accidentally be dislodged. After use, remember to
turn down the volume levels on the PA and/or stage amp before you disconnect
cables or the power supply.
USING THE 12/48V SWITCH
You can change the phantom power voltage from 48 volts to 12 volts using the
set & forget recessed 12/48V switch on the side of the SB-48UB. Use a small
screwdriver to access the switch.
When the switch is in the outward position, the SB-48UB will supply 48 volts of phan-
tom power. This is the normal setting for the majority of condenser microphones.
There are however, some miniature clip-on mics that are designed for use with 12
volt supplies. Pushing the 12/48V switch inward will supply the mic with 12 volts
of phantom power. Check the microphone manufacturer’s specifi cation to ensure
this switch is set accordingly.
Radial Engineering Ltd.
Radial Engineering Ltd.
Radial Engineering Ltd.
SB-48UB
®
Phantom Supply
SB-48UB
®
Phantom Supply
SB-48UB
®
Phantom Supply
MAKING CONNECTIONS
Connect the source microphone to the SB-48UB’s balanced XLR
input.
There are two audio outputs to choose from. The unbalanced ¼”
output is designed for guitar type devices such as effects pedals or
stage amplifi ers. It employs a step-up transformer to optimize the
impedance and signal level.
Using the unbalanced ¼” output with an instrument amplifi er.
AMP
CONDENSER MIC
The balanced XLR male output follows the AES standard with pin-
1 ground, pin-2 (+), pin-3 (-). This would be used when the PA or
recording system cannot deliver its own phantom power to your
condenser microphone.
PA SYSTEM
CONDENSER MIC
Using the balanced XLR output to feed the PA system.
Once all of the connections are made and the power is on, slowly
turn up the volume to test and make sure everything is working. It
is good practice to always test at low volumes as this can further
avoid loud transients from harming your audio system should a
connection be faulty.
PA SYSTEM
CONDENSER
MIC
AMP
RADIAL PZ-PRE
CO