www.rad
ialeng
.com
Radial Engineering Ltd.
1845 Kingsway Ave., Port Coquitlam, BC V3C 1S9, Canada
Tel: 604-942-1001 • Fax: 604-942-1010
email: [email protected]
True to the Music
Radial Engineering Ltd.
Radial Engineering Ltd.
5
J+4
™
User Guide
Radial J+4 user guide - Part #: R870 1235 00 / 08-2021
Subject to change without notice, all rights reserved
Stereo -10dB Unbalanced to +4dB
Balanced Converter and Line Driver
®
®
RADIAL ENGINEERING 3 YEAR TRANSFERABLE LIMITED WARRANTY
RADIAL ENGINEERING LTD. (“Radial”) warrants this product to be free from defects in mate-
rial 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. In the unlikely event that a defect is uncovered, please call 604-942-1001 or
email [email protected] to obtain an RA number (Return Authorization number) before
the 3 year warranty period expires. The product must be returned prepaid in the original ship-
ping 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 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, INCLUD-
ING 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.
J+4
™
User Guide
J+4
™
User Guide
FEATURES
Input Panel
1.
Stereo ¼" input jacks for -10dB
unbalanced sources like DJ mixers.
2.
Level control sets the optimum
output level for the line driver.
3.
Stereo 3.5mm input jack for -10dB
unbalanced sources like MP3 play-
ers and laptops.
4.
Stereo RCA input jacks for -10dB
unbalanced sources like CD and
DVD players.
5.
LED power indicator illuminates
when the 15VDC power supply is
connected.
Output Panel
6.
Left and right XLR jacks produce
a ba4dB line-level stereo
signal. AES standard pin-2 hot.
7.
Power connection for the included
15VDC/400mA supply.
8.
Rubber non-slip pad covers the
bottom and provides electrical and
mechanical isolation.
Side Panel
9.
Book-end outer shell protects the
jacks and controls from damage.
10.
Recessed high-pass fi lter switch.
Reduces low frequencies below
100Hz.
11.
Recessed ground lift switch
disconnects pin-1 at the XLR to
eliminate hum and buzz caused by
ground loops.
12.
Rugged baked enamel fi nish for
years of good looks.
Inside
13.
All connectors are insulated
from chassis to reduce noise and
crosstalk.
14.
Double sided military spec PCB
with full ground plane for low noise.
15.
Two custom designed Radial iso-
lation transformers eliminates noise
caused by ground loops.
16.
14-gauge inner I-beam frame
protects the PCB from torque and
prevents solder joint failure.
True to the Music
J+4 SPECIFICATIONS
Frequency response:
10Hz ~ 20kHz +/- 1dB (-3dB at 40kHz)
Signal to noise:
>100dB
Input level:
-10dBu typical
Maximum input level:
+17dBu
Maximum output level:
+15dBu
Dynamic range:
100dBu
Total harmonic dist noise:
0.004% @ 1k with -10dBu input (+4dBu output)
Channel separation:
>90dB
Self noise:
-95dBu
Input impedance:
10k-Ohms
Output impedance:
600-Ohms typical
High pass fi lter (low cut):
-3dB at 100Hz
XLR confi guration:
AES standard pin-1 ground, pin-2 hot, pin-3 cold
Power supply:
15VDC 400mA center pin positive
Power requirement:
30mA draw
Construction:
14-gauge chassis, outer shell, baked enamel fi nish
Size:
3.3” x 5.0” x 2” (84 x 127 x 48mm)
Weight:
1.55 lb (720g)
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