MasterSounds Radius 4 Operation Manual

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OPERATION!MANUAL!

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INDEX!

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1!–!SAFETY!INSTRUCTIONS!!
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2!–!OVERVIEW!!
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3!–!FRONT!PANEL!CONTROLS!!
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4!–!REAR!PANEL!CONTROLS!!
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5!–!WARRANTY!!
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6!–!TECHNICAL!SPECIFICATION!!

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1!-!Important!Safety!Instructions!–!Read!First!

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READ!THE!INSTRUCTIONS!-!Read!and!retain!these!instructions!for!future!

reference.!Adhere!to!all!warnings!printed!here!and!on!the!console!and!its!power!
unit.!

COVERS!-!Do!not!remove!the!power!unit!cover.!Operate!the!console!with!its!
cover!correctly!fitted.!Refer!servicing!work!to!authorised!personnel!only.!

MAINS!POWER!-!Connect!the!console!power!unit!to!a!mains!power!supply!only!
of!the!type!described!in!this!user!guide!and!marked!on!the!unit.!The!power!
source!must!provide!a!good!ground!connection.!Do!not!remove!or!tamper!with!
the!ground!connection!in!the!power!cord.!Use!the!power!cord!with!sealed!mains!
plug!appropriate!for!your!local!mains!supply!as!provided!with!the!console.!Route!
the!power!cord!so!that!it!is!not!likely!to!be!walked!on,!stretched!or!pinched!by!
items!placed!upon!or!against!it.!

INSTALLATION!-!Install!the!console!and!its!power!unit!in!accordance!with!the!
instructions!printed!in!this!user!guide.!Do!not!connect!the!output!of!power!
amplifiers!directly!to!the!console.!Use!audio!connectors!and!plugs!only!for!their!
intended!purpose.!

VENTILATION!-!Ensure!adequate!ventilation!around!the!console!and!its!power!
unit.!Do!not!obstruct!the!ventilation!slots!or!position!the!unit!where!the!air!flow!
required!for!ventilation!is!impeded.!

MOISTURE!-!To!reduce!the!risk!of!fire!or!electric!shock!do!not!expose!the!
equipment!to!rain!or!moisture!or!use!it!in!damp!or!wet!conditions.!Do!not!place!
containers!of!liquids!on!it,!which!might!spill!into!any!openings.!

ENVIRONMENT!-!Locate!the!units!away!from!direct!sunlight!and!any!equipment!
which!produces!heat,!such!as!power!supplies,!amplifiers!and!heaters.!Protect!
from!excessive!dirt,!dust,!heat!and!vibration!when!operating!and!storing.!Avoid!
tobacco!ash,!drinks!spillage!and!smoke,!especially!that!associated!with!smoke!
machines.!Do!not!mount!the!power!supply!on!any!surface!subject!to!resonance!
or!vibration.!

HANDLING!-!To!prevent!damage!to!the!controls!and!cosmetics!avoid!placing!
heavy!objects!on!the!console!surfaces,!scratching!the!surface!with!sharp!objects,!
or!rough!handling!and!vibration.!Protect!the!controls!from!damage!during!
transit.!Use!adequate!packing!if!you!need!to!ship!the!unit.!

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2!–!OVERVIEW!

In!November!2016!MasterSounds!launched!the!Radius!2!analogue!rotary!
DJ!mixer!in!collaboration!with!Union!Audio!to!a!rapture!of!global!praise.!Fast!
forward!seven!months!and!the!Radius!4!is!now!here,!a!product!ready!to!build!
upon!the!Radius!2’s!worldwide!success.!!

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The!Radius!4!has!been!designed!by!MasterSounds!and!Union!Audio!and!
developed!by!Union!Audio!at!their!Cornwall!based!workshops.!!Andy!Rigby­Jones,!former!head!of!design!for!the!world-renowned!Allen!&!Heath!Xone!DJ!
mixer!range,!personally!designed,!built!and!tested!the!analogue!electronics,!
whilst!MasterSounds!founder!Ryan!Shaw!not!only!worked!on!the!mixer’s!feature!
set,!but!his!family-owned!metalworking!factory!manufacture!the!mixer’s!outer!
casing.!!
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Each!mixer!is!lovingly!hand-built,!tested!and!shipped!directly!from!Union!Audio,!
ensuring!the!ultimate!in!quality,!reliability!and!performance.!

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Andy!says;!“Just!like!the!Radius!2,!the!Radius!4’s!signal!path!features!pure!!
high-end!analogue!topology!for!minimal!distortion,!low!noise!floor!and!high!
headroom,!aided!by!only!using!components!of!the!highest!quality.”!

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With!more!than!twenty!years’!experience!of!DJing,!as!well!as!a!background!in!
design!and!manufacturing,!MasterSounds!founder!Ryan!Shaw!says;!“The!Radius!
4!is!a!fabulous!addition!to!the!MasterSounds!range!and!is!a!response!to!
customers!who!love!the!Radius!2’s!unique!design,!but!require!4!channels!when!
DJing.!I!deal!with!customers!on!a!daily!basis!who!are!interested!in!audio!

upgrades,!and!central!to!the!setup!is!usually!a!rotary!mixer.”!
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The!Radius!4!offers!a!fantastic!clean,!open!and!dynamic!sound!on!both!LINE!and!
RIAA!inputs!across!all!4!channels,!as!well!as!great!usability.!The!mixer!features!
easy-reading!backlit!VU!Meters,!a!responsive!Master!EQ/Isolator,!a!smooth!
natural!sounding!Hi-Pass!Filter!and!Aux!Send!on!each!channel.!
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A!unique!feature!is!the!ability!to!reconfigure!the!Aux!Return!Jacks!as!a!Mix!Buss!
Insert,!giving!the!user!unparallelled!flexibility!for!FX!integration,!simply!at!the!
press!of!a!button.!

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And!last!but!not!least,!the!addition!of!two!Mic!inputs!gives!the!Radius!4!the!club!
standard!specification!seal!of!approval.!
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This!is!a!premium!product!for!true!music!lovers!that!comes!in!at!a!competitive!
price!point!given!the!dedication,!quality!and!love!that!has,!and!will!continue!to!
go,!into!each!hand-built!unit.!

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3!-!FRONT!PANEL!CONTROLS!

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MIC!I/P!SELECT!–!The!Radius!4!features!two!Microphone!inputs!on!CH1!&!CH2,!

which!are!located!on!the!rear!panel,!(see!the!MIC!ON!paragraph!in!the!Rear!
Panel!Control!section).!!!

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AUX!-!The!AUX!send!level!pot!adjusts!the!amount!of!channel!signal!level!sent!to!

the!Aux!Mix!Buss!(and!on!to!an!external!FX!unit).!Fully!clockwise!the!signal!level!
is!boosted!by!+10dBu,!allowing!for!precise!adjustment!of!FX!signals.!

PRE!-!The!PRE!button!switches!the!Aux!send!feed!from!Post!Fader!to!Pre!Fader!
(i.e.!set!to!Pre!Fader!it!will!still!send!to!the!Aux!Mix!Buss!with!the!rotary!fader!
down).!

TRIM!-!The!TRIM!pot!adjusts!the!input!signal!level!from!OFF!up!to!a!maximum!of!
+10dBu,!enabling!accurate!level!matching!between!different!musical!sources.!

LINE/RIAA!-!This!toggle!switch!selects!either!the!RIAA!(Phono)!level!input!in!its!
top!position,!or!the!LINE!input!in!the!bottom!position.!

HPF!-!HPF!stands!for!“High!Pass!Filter”.!!The!HPF!is!12dB!per!octave!and!can!be!
swept!from!15Hz!to!2kHz!by!turning!the!rotary!pot!clockwise.!The!HPF!is!a!great!
performance!tool!and!has!been!designed!to!sound!natural,!aiding!smooth!mixing.!

CUE!-!Each!CUE!button!routes!the!channel!signal!to!the!headphones.!Pressing!the!
Cue!button!illuminates!the!red!LED.!When!Cue!buttons!are!activated!you!can!
hear!the!selected!Cue!channels!playing.!!When!no!Cue!button!is!active!the!
headphone!signal!is!automatically!routed!to!the!Master!Mix!Buss.!

CH1-CH4!ROTARY!FADER!-!Each!channel!has!a!large!ROTARY!FADER!for!
precision!control!of!its!level!when!mixing.!The!rotary!ranges!from!fully!off!when!
anti-clockwise!to!unity!gain!(0dB)!when!clockwise.!For!best!performance!
operate!these!controls!near!to!their!fully!clockwise!position!for!normal!music!
level.!

VU!METERS!–!The!Radius!4!features!four!high!quality!analogue!VU!(Volume!
Unit)!meters,!which!accurately!measure!the!left!and!right!audio!signals.!The!
meters!show!the!post!EQ!sound!level.!An!added!feature!of!the!VU!Meters!is!that!
when!driven!over!+6VU!the!meter!will!illuminate!RED!to!warn!against!clipping.!
In!SPLIT!MODE!the!LEFT!VU!Meter!indicates!the!cue!signal!level,!and!the!RIGHT!
VU!Meter!indicates!the!MIX!level,!(see!SPLIT!below).!
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MASTER!EQ/ISOLATOR!-!The!MASTER!EQ/ISOLATOR!functions!as!a!normal!
isolator!using!12dB/octave!filters,!with!crossover!frequencies!at!350Hz!and!

3.5kHz!making!for!a!very!musical!isolator.!We!have!positioned!the!layout!of!the!
pots!so!it!easily!works!as!a!Master!EQ!(the!hi-pass!filters!on!each!channel!are!
used!instead!of!a!conventional!3!or!4!band!EQ).!
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MASTER!–!The!MASTER!rotary!pot!adjusts!the!signal!level!sent!to!the!Main!
Output!XLRs!(House!Mix)!ranging!from!off!to!+10dBu!of!gain.!Set!the!control!to!
approximately!1!o’clock!for!unity.!

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BOOTH!–!The!BOOTH!rotary!pot!adjusts!the!signal!level!sent!to!the!Booth!Output!

TRS!Jacks!(Monitor!Mix)!ranging!from!off!to!+10dBu!of!gain.!Set!the!control!to!
approximately!1!o’clock!for!unity.!

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SPLIT!–!The!SPLIT!CUE!button!illuminates!RED!when!activated!and!links!to!the!

CUE!buttons!and!VU!Meters.!!When!the!SPLIT!CUE!is!active!and!a!channel!CUE!is!
pressed,!the!Mix!Buss!Level!will!be!shown!on!the!Right!Meter,!and!the!channel!
Pre-Fade!signal!(CUE)!shown!on!the!Left!Meter,!enabling!you!to!balance!the!two!
levels!for!smoother!mixing.!The!Split!button!also!sends!the!cued!source!to!the!
Left!headphone!and!the!mix!source!to!the!Right!headphone,!which!is!very!useful!
if!mixing!in!a!quiet!environment.!SPLIT!CUE!is!automatically!disabled!when!the!
Channel!CUEs!are!off,!and!the!Meters!and!Headphones!revert!to!monitoring!the!
Stereo!Master!Mix!Signal.!

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PHONES!–!Use!the!headphone!pot!to!control!the!sound!level!sent!to!your!

headphones.!Please!take!care!when!monitoring!with!headphones!as!excessive!
sound!volumes!can!cause!premature!deafness.!The!¼”!jack!headphone!input!is!
located!on!the!front!of!the!mixer!as!shown!on!the!headphone!graphic.!
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4!-!REAR!PANEL!CONTROLS!

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MASTER!OUT!-!Output!level!is!+14dBu!when!the!MASTER!level!control!is!fully!
clockwise!and!the!VU!meters!read!-4VU.!!The!XLR!output!is!designed!to!operate!
with!balanced!equipment!such!as!powered!monitor!speakers!and!amplifiers.!

AUX!SEND!&!RETURN/INSERT!–!The!AUX!SEND!&!AUX!RETURN!system!has!¼”!
TRS!(balanced)!jack!sockets!for!connection!to!an!external!FX!unit.!The!SEND!is!
connected!to!the!FX!units’!input,!and!the!FX!units’!output!is!connected!to!the!
RETURN,!(see!USING!THE!EXTERNAL!SEND!&!RETURN!SYSTEM).!

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INSERT!ON!BUTTON!-!Reconfigures!the!Aux!Return!Jacks!as!a!Mix!Buss!Insert,!
giving!the!user!unparalleled!flexibility!for!FX!integration,!simply!at!the!press!of!a!
button,!(see!USING!THE!EXTERNAL!SEND!&!RETURN!SYSTEM).!

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GROUND!POST!-!Unscrew!the!knurled!nut!and!attach!the!turntable(s)!ground!
lead(s)!and!screw!back!into!place!without!over-tightening!the!nut.!

RECORD!OUT!–!Twin!RCA!sockets!enables!the!user!to!make!a!stereo!recording!of!
a!performance.!The!overall!volume!of!the!Master!Output!does!not!affect!the!
Record!Out!function—this!outputs!at!-6dBu.!

BOOTH!OUT!-!The!¼”!TRS!(balanced)!Jack!Booth!Output!feeds!the!DJ’s!booth!
(local!Monitor)!amplifier/loudspeaker!system.!

POWER!SWITCH!–!“O”!=!OFF,!press!the!“–“!to!power!the!mixer!ON!with!the!
external!power!supply!connected.!

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POWER!INPUT!SOCKET!–!Connect!the!external!18-19v!power!supply!to!the!

input!socket!as!labelled!on!the!rear!panel.!

CH!ONE-CH!FOUR!–!ALL!four!LINE!and!PHONO!inputs!feature!twin!(Left!&!
Right)!RCA!Phono!Sockets.!The!PHONO!input!provides!gain!and!RIAA!
equalisation!for!turntable!cartridges!on!CH!ONE-CH!FOUR.!The!LINE!inputs!on!
CH!ONE-CH!FOUR!provide!input!for!CD!players.!

MIC!1!MIC!2!INPUTS!!-!Two!female!XLR!sockets!enable!two!microphones!to!be!
connected!with!male!XLR!sockets.!

MIC!ON!–!Two!MIC!ON!buttons!enable!a!pair!of!microphones!to!be!used!on!CH1!
&!CH2!by!pressing!each!MIC!ON!button.!The!microphone!signal!is!attenuated!in!
the!same!way!as!a!Phono!or!Line!source,!(see!TRIM!&!CH1-CH4!ROTARY!
FADER!paragraphs!shown!in!the!FRONT!PANEL!CONTROLS!section).!To!switch!
off!a!MIC!input!press!the!MIC!ON!button.!

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USING!THE!EXTERNAL!SEND!&!RETURN!SYSTEM!

Connect!the!Mixer!Aux!Send!outputs!to!the!FX!unit!inputs!and!connect!the!FX!
units!outputs!to!the!mixer!Aux!Returns.!Set!the!FX!unit!to!unity!gain.!
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Turning!up!the!mixer!channel!send!control!feeds!the!channel!signal!to!the!FX!
unit.!This!signal!is!processed!by!the!FX!unit!and!its!output!is!fed!back!into!the!
mix,!adding!an!echo,!delay,!reverb!etc.!to!the!track!that’s!playing.!Turning!down!
the!mixer!channel!send!stops!the!channel!signal!feeding!to!the!FX!unit!and!so!
also!stops!the!effect.!Turning!up!the!mixer!channel!send!increases!the!level!of!FX.!
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Normally!the!feed!to!the!channel!AUX!send!is!also!controlled!by!the!channel!
fader,!so!turning!down!the!fader!also!turns!down!the!level!of!FX,!but!if!the!AUX!
send!PRE!button!is!pressed!the!AUX!send!takes!its!signal!before!the!Channel!
Fader!so!even!if!the!fader!is!off!you!can!still!send!the!channel!signal!to!the!FX!
Unit.!This!can!be!quite!a!cool!way!to!mix!into!a!new!track,!just!by!introducing!a!
low!level!delay!(for!instance)!of!the!track!you!are!about!to!mix!into,!before!
actually!mixing!in!the!new!track!by!bringing!up!the!channel!fader.!

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Mix!Insert!
The!Radius!4!incorporates!a!unique!feature!that!allows!the!Aux!Return!Jack!
Sockets!to!be!reconfigured!as!a!Mix!Buss!Insert!point,!just!by!pressing!the!
INSERT!ON!button.!!This!allows!you!to!run!the!entire!mix!though!an!external!FX!
processor!or!other!devices,!such!as!a!compressor,!limiter!or!graphic!equaliser.!
With!the!button!pressed!the!two!¼”!TRS!Jacks!become!a!conventional!mixer!
Insert,!with!the!Tip!being!the!SEND,!and!the!Ring!being!the!Return.!

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5!-!WARRANTY!

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MasterSounds!warrants!that!the!Mixer!shall!be!free!of!defects!in!workmanship!
and!materials!for!a!period!of!twelve!months!from!the!date!of!purchase.!In!the!
event!that!the!product!fails!to!operate!as!intended,!MasterSounds!will!repair!or!
replace!the!product!subject!to!the!following!conditions.!

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1. That!the!failure!was!not!due!to!improper!installation,!operation,!cleaning!
or!maintenance,!accident,!damage,!misuse,!abuse,!or!non-approved!
modifications!to!the!Mixer.!
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2. The!warranty!does!not!cover!normal!wear!and!tear!or!any!other!event,!act,!
default!or!omission!outside!MasterSounds!control.!
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3. Faulty!products!must!be!returned!to!MasterSounds!or!an!authorised!
service!agent!along!with!the!original!invoice!or!proof!of!purchase,!and!the!
mixer!must!be!returned!packed!in!the!original!shipping!box.!Please!contact!
MasterSounds!before!shipping!a!faulty!unit.!
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4. The!warranty!applies!only!to!the!original!purchaser!and!is!not!
transferrable.!
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5. At!their!sole!discretion,!MasterSounds!may!either!repair!the!defective!
product!or!replace!with!an!equivalent!service!exchange!item.!

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6. This!warranty!constitutes!the!purchaser’s!sole!remedy.!MasterSounds!
shall!not!be!liable!for!any!other!repair!or!replacement!cost!or!any!damage!
or!loss!directly!or!indirectly!related!to!the!malfunction!of!this!mixer.!

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MasterSounds!RADIUS!4!complies!with!the!European!Electromagnetic!
Compatibility!directives!2014/30/EU!and!the!European!Low!Voltage!
directives!2014/35/EU.!

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Radius!4!Operation!Manual!Issue!2!
Copyright!©!2016!MasterSounds!Audio.!All!rights!reserved!
http://www.mastersounds.co.uk/!

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6!-!TECHNICAL!SPECIFICATION!

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Dimensions! ! ! ! ! 350W!x!190D!x!80H!
Weight! ! ! ! ! 3.3KG!
Packed!Dimensions! ! ! ! 480W!X!270D!200H!
Packed!weight! ! ! ! 4.7KG!

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Power!Requirement!

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External!Power!Supply! Universal!90V!–!265V!AC!50/60Hz!18-

18-19V!30W!Max!

DC!Internal!Power!Rails! ! ! +/-!18V!DC!

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Audio!Performance!

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Residual!Output!Noise! ! ! <-97dBu!20Hz!to!20kHz!un-weighted!
Mix!noise!Unity!Line!IN!to!Mix!Out! ! <-89bBu!20Hz!to!20kHz!un-weighted!
Distortion!THD+N!Standard!Version! 0.0026%!Line!IN!to!Mix!OUT!0dBu!
Distortion!THD+N!Premium!Version! 0.0022%!Line!IN!to!Mix!OUT!0dBu!
Dynamic!Range! ! ! ! >116dB!
Maximum!Signal!Level! ! ! ±27dBu!
Frequency!Response!! ! ! 25Hz!–!50kHz!+0/-0.5dB!
15Hz!–!100kHz!+0/-3dB!
Headphone!Output!Power! ! ! 800mW!RMS!into!32!Ohms!

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EQ/Filters!

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Channel!High-Pass!Filter!Range! ! 15Hz!to!2kHz!
Master!EQ/Isolator!Cut/Boost! ! OFF!to!+12dB!
Master!EQ/Isolator!Crossover!Fc! ! 350Hz!and!3.5kHz!
RIAA!Accuracy! ! ! ! Within!0.25dB!40Hz!–!20kHz.!
Feedback!Reduction! ! ! ! Sub!30Hz!

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MasterSounds!reserves!the!right!to!change!the!specification!without!notice.!

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