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RADIAL ENGINEERING LTD. ("Radial") warrants this product to be free from defects in material and workman-
ship 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 com-
ponents 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 DE-
SCRIBED ABOVE. NO WARRANTIES WHETHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIM-
ITED 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 SPE-
CIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS, WHICH MAY VARY DEPENDING ON
WHERE YOU LIVE AND WHERE THE PRODUCT WAS PURCHASED.
Radial Engineering Ltd.
1638 Kebet Way, Port Coquitlam BC V3C 5W9
tel: 604-942-1001 • fax: 604-942-1010
email: info@radialeng.com • web: www.radialeng.com
Radial 8ox and 8cx Owner's Manual - Part #R870 1185 • V1.0
Specifi cations and appearance are subject to change without notice.
RADIAL ENGINEERING LTD.
3 YEAR TRANSFERABLE WARRANTY
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Summarization of Contents
Introduction and Design Concept
Introduction
Provides a welcome and overview of the manual's content for 8ox and 8cx splitters.
8ox Design Concept
Details the design philosophy and benefits of the 8ox eight-channel microphone splitter.
Product Basics and Core Concepts
What is a Mic Splitter
Explains the fundamental purpose and systems involved in mic splitting for live sound.
How a Transformer Works
Details the construction and principle of operation of audio transformers for signal isolation.
Understanding Ground Loops
Identifies the cause, effect, and prevention of ground loops in audio systems.
Transformer Sound Quality
Discusses the specific sonic characteristics and design of Radial's transformers for pro-audio applications.
Signal Flow Explained
Parallel Input Options
Describes the multiple input connection options available on the 8ox: XLR, DB-25, and Euroblocks.
Direct Output Path
Explains the primary 'straight through' output and its role as a phantom power return path.
Auxiliary Output with Ground Lift
Details the auxiliary output featuring a front panel ground lift switch for noise reduction.
Isolated Output Function
Covers the transformer-isolated output designed to block noise caused by ground loops.
-20dB Pad Function
Explains the function of the -20dB pad switch to prevent transformer overload with high-output devices.
Transformer Details
Describes the internal audio isolation transformer and its grounding options.
RF Filter Mention
Mentions an RF filter on inputs to prevent unused pins from acting as antennas when ground is lifted.
8ox Feature Set Overview
Front Panel XLR Inputs
Front panel female XLR jacks allowing easy connection of individual signals.
Front Panel -20dB Pad Switch
Switch to prevent transformer overload when connecting high output devices.
Front Panel Ground Lift Switch
Disconnects the ground path at the auxiliary direct output to eliminate ground loop noise.
Easy ID Label Zones
Zones for using dry-erase markers or wax pencils for connection identification.
Military Grade PCB Construction
Describes the robust dual layer printed circuit board manufactured to military standards.
Transformer Mounting and Options
Details transformer mounting directly on PCB and choice of Radial or Jensen transformers.
Heavy-Duty Switch Specifications
Notes the durability and rating of the front panel switches rated at 20,000 operations.
Internal Channel Ground Lift
Internal switch to re-connect ground around the transformer per channel for specific grounding needs.
Internal Chassis Ground Lift
Switch to connect signal ground (pin-1) to the chassis for grounding schemes.
14-Gauge Chassis
Describes the heavy-gauge steel chassis providing excellent shielding and durability.
Isolated Output
Transformer isolated output to block noise caused by ground loops.
Direct With Ground Lift
Auxiliary output wired in parallel with DIRECT, with ground lift via front panel switch.
DB-25 Pin-out Diagram
Diagram showing the pin-out for the female DB-25 connector following Tascam standard.
Euroblock Sockets
Describes the WAGO/Phoenix terminal blocks for quick, solder-free I/O connections.
Direct Output
Primary output passing signal through the 8ox and providing phantom power return.
Rear Inputs
DB-25 and Euroblock rear inputs wired parallel to the front XLR connectors.
Chassis Ground
Ground screw connection point used for bonding the 8ox chassis to technical ground.
Connecting the 8ox
8ox Inputs
Details how to connect microphones and direct boxes using front panel XLRs, rear DB-25, and Euroblocks.
Connecting the DB-25 I/O
Explains connecting to devices using the TASCAM standard DB-25 pin-out for analog audio.
Connecting the Euroblock Terminals
Describes using WAGO spring clamp terminals for quick, reliable on-site connections.
Console Connection Examples
Connecting Two Mixing Consoles
Illustrates a basic setup where MAIN PA and MONITOR consoles access stage signals.
Connecting Three Mixing Consoles
Details an advanced setup connecting MAIN PA, MONITOR, and RECORDING consoles.
Internal Grounding Options
Internal Ground Lift - Each Channel
Internal switch to re-connect ground around the transformer per channel for specific grounding needs.
Internal Chassis Ground Lift - All Channels
Switch to connect signal ground (pin-1) to the chassis for grounding schemes.
Radial 8cx Introduction and Design
Radial 8cx Introduction
Introduces the 8cx as an easy-to-use, contractor-friendly eight-channel splitter.
8cx Design Concept
Explains the 8cx's suitability for permanent installations and its signal splitting capabilities.
8cx Feature Set
Skeleton Frame
Describes the 9.5" x 5" 14-gauge steel frame and its mounting features.
Radial Transformer
Details transformer mounting directly on PCB for shortest signal path.
WAGO Terminal
Used for I/O connections, featuring a spring clip to clamp wires securely.
Ground Lift DIP Switch
Each channel has a DIP switch to disconnect signal ground at the DIRECT WITH LIFT output.
Inputs
Eight channels of balanced signals connect to the 8cx input via WAGO spring terminal.
Legends
PCB is marked with termination information screened directly on the board.
Direct Output
Output passes signal straight through, usually the return path for phantom power.
Direct with Lift
Auxiliary output with signal ground lift capability via DIP switch.
Isolated Output
Transformer isolated output to block hum and buzz caused by ground loops.
Military Grade PCB
Dual layer circuit board manufactured to military standards with plated through holes.
Mounting and Terminating the 8cx
Mounting the 8cx
Describes using the pre-drilled mounting feet and frame perforations for cable management.
Connecting the WAGO Terminals
Explains how to strip wire and use a screwdriver to connect wires to WAGO spring clamp terminals.
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