www.radialeng.com
Radial Engineering Ltd.
1845 Kingsway Ave., Port Coquitlam, BC V3C 1S9, Canada
Tel: 604-942-1001 • Fax: 604-942-1010
email: info@radialeng.com
Pro48
™
Active Direct Box
True to the Music
Radial Pro48 user guide - Part #: R870 1135 00 - v2.2 / 09-2021
Specifi cations and appearance subject to change without notice.
Copyright © 2009 Radial Engineering Ltd.
Pro48
™
User Guide
Radial Engineering Ltd.
RADIAL LIMITED THREE YEAR
TRANSFERABLE 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 fi 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. To make a request or claim under this limited warranty, the
product must be returned prepaid in the original shipping container (or equivalent)
to Radial or to an authorized Radial repair center 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 warranty. This limited warranty shall not apply if the product has been
damaged due to abuse, misuse, misapplication, accident or as a result of service
or modifi 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.
Pro48
™
User Guide
Radial Engineering Ltd.
FEATURES AND FUNCTIONS
1
INPUT - jack connects to instruments
like guitars and keyboards.
2
-15dB PAD - reduces the input level
by 15dB to prevent overload from
high output devices.
3
LED INDICATOR - lights to confi rm
phantom power is active and the
Pro48 is working.
4
THRU - jack passes the instrument
signal to the on-stage amplifi er.
5
FULL BOTTOM FOOT - neoprene
foam foot provides electrical isolation
and plenty of friction to stay put.
6
14 GAUGE STEEL - bookend shell
creates a protective zone around the
switches and connectors.
7
OUTPUT - Balanced mic-level
output drives long cables without
appreciable loss.
8
GROUND LIFT - helps to reduce hum
and buzz caused by ground loops.
9
SWITCHING POWER SUPPLY -
steps up the current from phantom
power to produce 9 volt internal rails.
With more voltage to work with than
typical active DI’s, the Pro48 exhibits
more headroom and dynamic range
while lowering noise.
10
MILITARY-GRADE - double-sided
PCB is bolted to steel standoff s for
road-tough construction.
11
ISOLATED CONNECTORS - are
100% electrically isolated from the
chassis.
12
ACTIVE DRIVE CIRCUIT -
electronically balances the signal
and converts it to low-Z mic-level.
13
I-BEAM DESIGN - inner steel
enclosure is made extremely rigid
with an I-beam profi le. This eliminates
stress that could torque the PC board
and cause solder joint failure.
1 2 3 54
6 7 8
10
9
11
12
13
True to the Music
Pro48 SPECIFICATIONS
Frequency response: 20Hz to 40kHz
Linear performance: +/- 0.12dB 20Hz to 20kHz
Total harmonic distortion: 0.01 % from 20Hz to 20kHz
Input impedance: 220K ohms
Balanced outputs: 600 ohms, mic level
PAD: -15dB
Power: 48V Phantom
This device complies with section 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.
®
®
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