Radial Engineering Duplex Quick Start Guide
Radial™ Smart Sheet
Order No. R800 1020
JDI™ Duplex MK4 STEREO PASSIVE DI
The Radial JDI Duplex is a high performance two channel direct box that is designed to
provide maximum fl exibility for the audio engineer in the most demanding applications. It
features two custom Radial Eclipse transformers for optimal signal transfer with absolute
minimum distortion while providing a smooth and warm sounding Bessel response. This
makes the Radial Duplex perfect for producing a more analogue character from digital
sources such as pianos and samplers that tend to sound ‘edgy’.
Each channel of the Radial Duplex features two parallel ¼” and RCA inputs for source connection and thru-put to a high impedance destination. This is augmented with an XLR input
for balanced +4dB sources. Front panel controls include a -15dB pad for high level sources,
a high-cut fi lter to help eliminate noise from older electronic devices and a stereo-to-mono
merge function that mixes two inputs to mono at the XLR output.
As with all Radial products, the Duplex is built for the road but ‘cleans-up’ nicely for the most
elegant studio date. Plug & play easy to use, the Duplex is perfect for all instruments and
high output sources where the most demanding audio quality is required.
Features
• Best sounding stereo DI in the world!
• Linear response from 10Hz ~ 40kHz
• Enhanced connectivity: ¼”, RCA, and XLR inputs
• Extraordinary level handling without distortion
• Built to handle the rigors of live touring
Applications
• Digital piano, samplers and keyboards
• Stereo bass guitar & synth setups
• CD, DJ mixers and DVD players
• High output balanced +4dB sources
Cool Factors
• ‘Plug & play’ easy-to-use!
• Transformer isolation eliminates hum & buzz
• Virtually impossible to overload
• No battery or phantom power required
• Makes just about anything sound better!
• 3 year transferable warranty
• 20 years on the transformers
-15dB PAD allows
super-hot signals
to be connected
without distortion.
HI-CUT FILTER
works when the
PAD is engaged
to reduce hiss
and noise.
+4dB XLR INPUT
for balanced linelevel sources like
mixing consoles
and pro VTRs.
BOOK-END DESIGN
creates a protective
zone around the jacks
and switches.
14-GAUGE STEEL
welded I-beam enclosure makes it impossible to
torque the PC board. Eliminates
cold solder joints.
¼” Phone and RCA
jacks for instruments
and line-level sources
like CD players.
180° POLARITY REVERSE
on the XLR output helps
align phase when mixing
with mics.
XLR-IN SELECT
activates the +4dB XLR
input and disconnects
the ¼” & RCA jacks.
GROUND LIFT helps
reduce noise caused
by ground loops. Lift
pin-1 on both channels.
MERGE turns the input
and thru jacks into a
passive mixer to sum
stereo signals to mono.
XLR OUTPUT 600Ω
balanced mic-level
output for runs to 1000’
(300m) without noise.
Radial Eclipse nickel core
transformer for distortion-free
signal transfer and 100%
isolation.
MU-METAL SHIELD
for protection against radio
frequency and electromagnet
interference.
Two Mono Instruments
Great for any dual instrumentalist. Like bass
pedal and bass guitar. THRU jack used to connect on-stage amp.
Bass
Guitar
Bass
Pedals
Radial Engineering Ltd. • DI & Interface Series Smart Sheet © Copyright 2012 all rights reserved · www.radialeng.com · email info@radialeng.com • Subject to change without notice • Made in Canada
Two Stereo Keyboards
MERGE function allows two keyboards to connect and maintain their stereo image.
L
L
R
Stereo image
is maintained.
R
+4dB Pro Signals and -10dB Consumer
The +4dB XLR input accepts signal from proaudio devices like broadcast VTRs and mixers.
+4dB Line Source
L
L
R
R
L
R
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