MasterSounds Livear 4V User manual

Linear 4V Radius 4V
Operation Manual

Index
1: Safety instructions pg3
2: Overview pg4
3: Front panel controls pg5
4: Rear panel controls pg8
5: Warranty pg10
6: Technical specification pg11
Linear 4V Radius 4V
Operation Manual Index 2

1: Important safety instructions - Read rst
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 a 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.
Linear 4V Radius 4V
Operation Manual Safety Instructions 3

2: Overview
Following the worldwide success of the Radius 2 and 4 analogue rotary
DJ mixers, MasterSounds and Union Audio continue their award winning
partnership with the launch of the Linear 4V and Radius 4V valve DJ
mixers.
The Linear 4V & Radius 4V have been designed by Union Audio and
MasterSounds and developed by Union Audio at their Cornwall based
workshops. Andy Rigby-Jones, 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 worked on the mixer’s feature set and sound.
Each mixer is lovingly hand-built, tested and shipped directly from Union
Audio, ensuring the ultimate in quality, reliability and performance.
Andy says: “The Linear 4V & Radius 4V’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. The
addition of a fully discreet mix stage further adds to the sound quality
of our unique creation.”
With more than twenty years’ experience of DJing, as well as a background
in design and manufacturing, MasterSounds founder Ryan Shaw says: “The
Linear 4V and Radius 4V are a fabulous addition to the MasterSounds range
and are a response to customers who loved the Radius 2 and 4’s design, but
required a more traditional mixer layout, including 3 band EQ, LED meter
on each channel and a cross fader. The addition of a valve on each of the
4 input channels adds to the Linear 4V & Radius 4V’s unique feature set
and beautiful sound.”
The Linear 4V and Radius 4V offer 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, 3 band EQ per channel, assignable cross
fader, LED meter on each channel and Aux send system.
A unique feature is the ability to reconfigure the Aux Return Jacks
as a Mix Buss Insert, giving the user unparalleled flexibility for
FX integration, simply at the press of a button. This system marries
perfectly with the MasterSounds FX unit.
And last but not least, the addition of two Mic inputs gives 4V the club
standard specification seal of approval.
This is a premium product for true music lovers that comes in at a
competitive price point for the dedication, quality and love that goes,
and will continue to go, into each hand-built unit.
Linear 4V Radius 4V
Operation Manual Overview 4

3: Front panel controls
Linear 4V Radius 4V
Operation Manual Front panel controls
MIC I/P SELECT – The Radius 4V & Linear 4V feature two Microphone inputs
on CH1 & CH2, which are located on the rear panel, (see the MIC ON
paragraph in the Rear Panel Control section).
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 button selects either the RIAA (Phono) level input in
its top position, or the LINE input in the bottom position as indicated
with screen printed text.
(Linear 4V shown)
5

3 BAND EQ – The Radius 4V & Linear 4V feature a traditional HIGH MID
LOW equalisation system, each pot gives -20dB of cut and +6dB of boost
per band.
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.
VALVE SLOT – There are 4 valve slots on the front panel, with an
attractive perforated mesh below each slot arrangement. Below each shot
shows the valve, with a red LED glow around it.
XFADE SWITCH – Below each CUE button is a XFADE toggle switch. This
switch assigns the cross fader to the desired channel. If the XFADE
toggle switch is set to X the channel mix is sent via the cross fader
and sound will be heard if the cross fader is set to X. When the OFF
toggle is selected sound bypasses the cross fader, and when the toggle
switch is set to Y no sound will be heard in the mix if the cross fader
is set to X.
LED METER – Each of the 4 channels features a 10 bar LED meter. This
visually shows the amount of input signal being processed through each
channel, ranging from -25dB to PK (PEAK SIGNAL). Normal operating
range should be -6dB to +6dB with an average of 0dB. This gives enough
headroom for unexpected peaks in the musical signal. It is important to
be aware that if the signal reaches PK the channel should be turned down
as distortion could occur.
CH1-CH4 ROTARY FADER (Radius 4V) - 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.
CH1-CH4 LINEAR FADER (Linear 4V) - Each channel has a high quality
linear fader for precision control of its level when mixing. The fader
ranges from fully off when the channel fader is down, to unity gain
(0dB).
VU METERS – The Radius 4V & Linear 4V feature two 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 on pg 7).
Linear 4V Radius 4V
Operation Manual Front panel controls 6

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.
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.
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.
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) will be 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.
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.
X FADE CONTOUR – This pot enables precise control of the cross fader
slope giving lots of scope for a variety of mixing styles. When the pot
is turned full anti clockwise, the cross fader slope is very mild, great
for blending tracks. Rotate the pot clockwise and you will hear the
cross fader slope sharpen up. Fully rotate the pot clockwise for ultra
sharp cuts when scratching.
ADD MIX – The add mix knob controls the amount of stereo house mix sent
to your cued track in the headphones. When the knob is rotated fully
anti clockwise only the cued track will be heard. Turning the knob
clockwise increases the amount of house mix that can be heard in the
headphones.
CROSS FADER – Linear 4V & Radius 4V use a high quality Penny & Giles
cross fader. The cross fader enables you to mix between signals assigned
to X or Y as indicated in the screen-printed text. The addition of
a cross fader enables a variety of DJ styles to be performed with
ease, from a basic fade, to smooth beat matching and complex scratch
manoeuvres. Use the cross fader with the XFADE SWITCH (SEE ABOVE) to
select which channels to assign to the X or Y position.
Linear 4V Radius 4V
Operation Manual Front panel controls 7

Linear 4V Radius 4V
Operation Manual Rear panel controls 8
4: Rear panel controls
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).
INSERT ON BUTTON - Reconfigures the Aux Return Jacks as a Mix Buss
Insert, giving the user unparalleled flexibility for FX integration at
the press of a button (see USING THE EXTERNAL SEND & RETURN SYSTEM).
GROUND POST - Unscrew the knurled nut, attach the turntable(s) ground
lead(s), and screw back into place without over-tightening the nut.
RECORD OUT – Twin RCA sockets enable 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.
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.
(Linear 4V shown)

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.
Using the external Send & Return System
Connect the Mixer Aux Send outputs to the FX unit inputs and connect
the FX unit’s outputs to the mixer Aux Returns. Set the FX unit to
unity gain.
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, or other effect
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.
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. However if the AUX send PRE button is pressed, the AUX send takes
its signal before the Channel Fader so the channel signal can be sent
to the FX Unit even if the fader is off. This can be a cool way to
mix into a new track: introducing a low level delay of the track you
are about to mix into, before mixing in the new track by bringing up
the channel fader.
MIX INSERT – The Radius 4V & Linear 4V incorporate 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
device, 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.
Linear 4V Radius 4V
Operation Manual Rear panel controls 9

www.mastersounds.co.uk
Linear 4V Radius 4V Operation Manual
Copyright © 2018 MasterSounds Audio. All rights reserved 10
5: Warranty
MasterSounds warrants that the Mixer shall be free of defects in
workmanship and materials for a period of twenty-four months (2 years)
from the date of delivery. In the event that the product fails to
operate as intended, MasterSounds will repair or replace the product
subject to the following conditions.
That the failure was not due to improper installation, operation,
cleaning or maintenance, accident, damage, misuse, abuse, or non-
approved modifications to the Mixer.
The warranty does not cover normal wear and tear or any other event,
act, default or omission outside MasterSounds control.
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.
The warranty applies only to the original purchaser and is not
transferrable.
At their sole discretion, MasterSounds may either repair the defective
product or replace with an equivalent service exchange item.
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.
1.
2.
3.
4.
5.
6.
MasterSounds 4V complies with the European
Electromagnetic Compatibility directives
2014/30/EU and the European Low Voltage
directives 2014/35/EU.

6: Technical specication
Dimensions
Weight
Packed Dimensions
Packed weight
Power Requirement
External Power Supply
DC Internal Power Rails
Audio Performance
Residual Output Noise
Mix noise Unity Line IN to Mix Out
Distortion THD+N
Dynamic Range
Maximum Signal Level
Frequency Response
Headphone Output Power
EQ/Filters
Channel EQ
Channel EQ Frequency
Master EQ/Isolator Cut/Boost
Master EQ/Isolator Crossover Fc
RIAA Accuracy
Linear 4V Radius 4V
Operation Manual Technical specification 11
MasterSounds reserves the right to change the specification without notice.
350W x 282D x 80H
4.75KG
460W X 360D 180H
6.3KG
Universal 90V – 265V AC 50/60Hz
18-18-19V 50W Max
+/- 18V DC
<-97dBu 20Hz to 20kHz un-weighted
<-89bBu 20Hz to 20kHz un-weighted
<0.01% Line IN to Mix OUT 0dBu
>116dB
±27dBu
10Hz – 50kHz +0/-1dB
10Hz – 80kHz +0/-3dB
800mW RMS into 32 Ohms
3 Band -20/+6dB
100Hz, 1kHz, 5kHz
OFF to +12dB
350Hz and 3.5kHz
Within 0.25dB 40Hz – 20kHz.

Linear 4V Radius 4V Operation Manual
Copyright © 2018 MasterSounds Audio. All rights reserved
www.mastersounds.co.uk