Radial Engineering Pro48 Bruksanvisning
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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.
®
®
User Guide
Produktspecifikationer
| Varumärke: | Radial Engineering | 
| Kategori: | Inte kategoriserad | 
| Modell: | Pro48 | 
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