J+4 Active stereo -10dB unbalanced to +4dB balanced converter, Radial
Radial J+4 is a stereo interface designed to accept
level -10dB unbalanced high impedance signals and
them to +4dB balanced low impedance signals for easy
in professional level environments such as
studios and live touring.
Careful attention has been paid to eliminate
noise by combining
the advantages of active signal buffering with
isolation. The J+4 delivers better than 95dB
signal to noise
while ensuring hum and buzz caused by ground loops
with spurious noise from clocking does not pollute
path. Controls have been kept to a minimum.
a stereo level control, high pass (low cut filter)
A selection of input connectors include a
set of �`` jacks for DJ mixers or keyboards, RCA's
for CD players and a mini 3.5mm for I-pods.
As with all Radial products, the Radial J+4 is
to handle the extreme rigors of professional
unique 14-gauge steel I-beam inner frame ensures
PC board will not be subjected to outside stress
potentially cause solder joints to fail. An
outer shell creates protective zones around the
controls, switches and connectors to further
while a full bottom no-slip pad provides both
and electrical isolation.
The Radial J+4 balanced line driver delivers
sonic performance, plenty of headroom and ultra
making it the ideal companion in today's more
professional audio systems.
Designed to be plug
simple, the Radial J+4 is extremely easy to use. It
choice of ��, RCA and 3.5mm stereo inputs and
standard 3 pin balanced XLR outputs.
& Powering Up
Before making connections, start by making sure
system levels are either turned off or volume down
any connection popping that could harm your
the 15VDC power supply. Note that the J+4 comes
with its own power supply. If yours gets lost or
make sure you replace it with an original Radial
as the output and polarity are properly matched.
power is connected the front panel power-on LED
Connect the desired source
(ie: a CD player, i-Pod, computer sound card, DJ
to the stereo input jacks. Connect the XLR outputs
mixing console. Keep in mind that the J+4 produces
level output. This means that you can bypass the
stage on your mixer or even drive a power
from the J+4.
It is always a good idea
the audio at low levels to make sure all your
are working. Set the level control on the J+4 to
all the way counter-clockwise to 7 o�clock. Turn
the source device (example: CD player). Bring up
on your audio system and slowly increase the level
J+4. Listen. If you hear distortion, check to make
the J+4 is not overdriving your console. If you
or buzz, try lifting the ground switch this lifts
on both XLR outputs. You should be ready to go.
High Pass Filter
The Radial J+4 is equipped with a handy high-pass
that is used to cut low frequencies below 100Hz.
several important benefits. First and foremost,
back audio tracks through a PA system, excessive
end can produce low frequency resonance which in
cause run-away feedback. It is also important to
bass frequencies contain significantly more energy
higher frequencies. Reducing bass content can
increase your system�s dynamic range. Finally, by
reducing unneeded low frequencies, it really helps
up the mix.
|10Hz ~ 20kHz (+/- 1dB � -3dB at
distortion + noise:
||0.004% (-10dBu input, +4dBu output)
filter (low cut):
||-3dB at 100Hz
||AES standard� pin-1 ground, pin-2 hot
|| 15VDC 400mA center positive - 30mA draw
power supply included
|14 gauge steel chassis and outer shell,
|3.3" x 5.0" x 2"
(84 x 127 x 48mm)
|1.55 lb (720 g)