MasterSounds Linear 4V & Radius 4V DJ Mixer Operation Manual

1. Important Safety Instructions

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.

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 an 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.

Image Description: The front panel of the mixer features four channels, each with input selection (LINE/RIAA), TRIM, CUE, and a channel fader (rotary for Radius 4V, linear for Linear 4V). Other controls include MIC I/P SELECT, AUX send, PRE button, 3-band EQ (HIGH, MID, LOW), XFADE SWITCH, LED meters, VALVE SLOTS, MASTER EQ/ISOLATOR, MASTER, BOOTH, SPLIT, PHONES, X FADE CONTOUR, ADD MIX, and a CROSS FADER.

3. Front Panel Controls

Channel Controls (CH 1-4)

• MIC I/P SELECT: Selects microphone input on CH1 & CH2 (located on rear panel).
• TRIM: Adjusts input signal level from OFF to +10dBu for accurate level matching.
• LINE/RIAA: Selects between RIAA (Phono) or LINE input level.
• 3 BAND EQ: HIGH, MID, LOW equalization system providing -20dB cut and +6dB boost per band.
• CUE: Routes the channel signal to the headphones, indicated by a red LED.
• VALVE SLOT: Four slots on the front panel, each housing a valve with a red LED glow.
• XFADE SWITCH: Assigns the cross fader to the desired channel (X or Y). 'OFF' bypasses the cross fader.
• LED METER: 10-bar meter showing input signal level from -25dB to PK (Peak Signal). Normal operating range is -6dB to +6dB.
• CH1-CH4 ROTARY FADER (Radius 4V): Controls channel level, from fully off (anti-clockwise) to unity gain (0dB, clockwise).
• CH1-CH4 LINEAR FADER (Linear 4V): Controls channel level, from fully down (off) to unity gain (0dB).

Master and Monitoring Controls

• VU METERS: Two analogue VU meters displaying left and right audio signals (post EQ). Meters illuminate RED over +6VU to warn against clipping. In SPLIT MODE, LEFT meter shows CUE level, RIGHT meter shows MIX level.
• MASTER EQ/ISOLATOR: Functions as an isolator with 12dB/octave filters at 350Hz and 3.5kHz, also usable as a Master EQ.
• MASTER: Adjusts signal level to the Main Output XLRs (House Mix) from off to +10dBu gain.
• BOOTH: Adjusts signal level to the Booth Output TRS Jacks (Monitor Mix) from off to +10dBu gain.
• SPLIT: When activated, links CUE buttons and VU Meters. The Left VU Meter shows CUE signal, Right VU Meter shows MIX signal. Sends cued source to Left headphone and mix to Right headphone.
• PHONES: Controls headphone output level. A 1/4 inch jack headphone input is located on the front.
• X FADE CONTOUR: Adjusts the cross fader slope for various mixing styles, from mild blending to sharp cuts.
• ADD MIX: Controls the amount of stereo house mix sent to the cued track in headphones.
• CROSS FADER: High-quality Penny & Giles cross fader for mixing between signals assigned to X or Y.

4. Rear Panel Controls

• MASTER OUT: XLR output for balanced equipment (monitors, amplifiers). Output level is +14dBu at full gain.
• AUX SEND & RETURN/INSERT: 1/4 inch TRS jack sockets for connecting external FX units. SEND connects to FX input, RETURN connects to FX output.
• INSERT ON BUTTON: Reconfigures Aux Return Jacks as a Mix Buss Insert for FX integration.
• GROUND POST: For connecting turntable ground leads.
• RECORD OUT: Twin RCA sockets for stereo recording. Output level is -6dBu, unaffected by Master Output volume.
• BOOTH OUT: 1/4 inch TRS jack output for the DJ's booth monitor system.
• POWER SWITCH: "0" for OFF. Press the "-" [power-symbol] to power ON with the external power supply connected.
• POWER INPUT SOCKET: Connects the external 18-19V power supply.
• CH ONE-CH FOUR: Four sets of LINE and PHONO RCA inputs. PHONO inputs provide gain and RIAA equalization for turntables. LINE inputs are for CD players.
• MIC 1 MIC 2 INPUTS: Two female XLR sockets for connecting two microphones.
• MIC ON: Buttons to enable microphone inputs on CH1 & CH2.

Using the External Send & Return System

Connect Mixer Aux Send outputs to FX unit inputs and FX unit outputs to mixer Aux Returns. Set FX unit to unity gain. Adjusting the channel send control feeds the channel signal to the FX unit for effects like echo, delay, or reverb. The PRE button allows the AUX send to take signal before the channel fader, enabling effects to be introduced even when the fader is down.

MIX INSERT

The Aux Return Jack Sockets can be reconfigured as a Mix Buss Insert point by pressing the INSERT ON BUTTON. This allows the entire mix to be processed through external devices like compressors or equalisers. The 1/4 inch TRS Jacks function as a conventional mixer insert, with the Tip as SEND and the Ring as RETURN.

5. Warranty

MasterSounds warrants the Mixer to be free of defects in workmanship and materials for twenty-four months (2 years) from the date of delivery.

Conditions:

• Failure not due to improper installation, operation, cleaning, maintenance, accident, damage, misuse, abuse, or non-approved modifications.
• Warranty does not cover normal wear and tear or events outside MasterSounds control.
• Faulty products must be returned to MasterSounds or an authorised service agent with proof of purchase, packed in the original shipping box. Contact MasterSounds before shipping.
• Warranty applies only to the original purchaser and is not transferable.
• MasterSounds may, at its discretion, repair or replace the defective product with an equivalent service exchange item.
• This warranty is the purchaser's sole remedy. MasterSounds is not liable for other repair costs or damages related to malfunction.

The MasterSounds 4V complies with European Electromagnetic Compatibility directives (2014/30/EU) and Low Voltage directives (2014/35/EU).

Copyright: © 2018 MasterSounds Audio. All rights reserved.

Website: www.mastersounds.co.uk

6. Technical Specification

Dimensions & Weight

• Dimensions: 350W x 282D x 80H
• Weight: 4.75KG
• Packed Dimensions: 460W x 360D x 180H
• Packed weight: 6.3KG

Power Requirement

• External Power Supply: Universal 90V - 265V AC 50/60Hz
• DC Internal Power Rails: 18-18-19V 50W Max, +/- 18V DC

Audio Performance

• Residual Output Noise: <-97dBu (20Hz to 20kHz un-weighted)
• Mix noise Unity Line IN to Mix Out: <-89dBu (20Hz to 20kHz un-weighted)
• Distortion THD+N: <0.01% Line IN to Mix OUT 0dBu
• Dynamic Range: >116dB
• Maximum Signal Level: ±27dBu
• Frequency Response: 10Hz - 50kHz +0/-1dB
• Headphone Output Power: 800mW RMS into 32 Ohms

EQ/Filters

• Channel EQ: 3 Band -20/+6dB
• Channel EQ Frequency: 100Hz, 1kHz, 5kHz
• Master EQ/Isolator Cut/Boost: OFF to +12dB
• Master EQ/Isolator Crossover Fc: 350Hz and 3.5kHz
• RIAA Accuracy: Within 0.25dB 40Hz - 20kHz.

MasterSounds reserves the right to change the specification without notice.