The MasterSounds Radius 4 is a high-end, four-channel analog rotary DJ mixer known for its exceptional sound quality, robust build, and minimalist design. It is hand-built in the UK by Union Audio, a company run by Andy Rigby-Jones, the co-designer of the Allen & Heath Xone series mixers
The Radius 4 is designed for professional DJs and audiophiles who prefer a high-fidelity, all-analogue signal path. Its features are focused on quality and performance rather than digital effects or complex routing
Audio Quality: The mixer is praised for its warm, open, and dynamic sound, attributed to its high-end analogue topology and quality components like Alps pots/switches and Panasonic capacitors. A premium version with upgraded operational amplifiers (op-amps) was also available for an even more transparent sound.
- Rotary Faders: The main channel volume controls are smooth, gradual rotary faders, designed for seamless, long blends that are characteristic of the rotary mixing style.
- Filters and EQ/Isolator: Each channel features a smooth, natural-sounding high-pass filter (HPF) with a variable Q, which is a unique feature in this style of mixer. A responsive master EQ/isolator with a full kill function is also included for sound shaping, offering a cut/boost of up to +12dB across three (or four in the Mk2 version) frequency bands.
- Connectivity: It offers switchable line and phono inputs on all four channels, with the first two also including microphone inputs, making it a club-standard specification. It features balanced XLR master outputs, a booth output on balanced jacks, and a record output on RCAs.
- Aux Send/Return: An assignable send and return loop allows for the integration of external effects units, with individual level controls per channel. A unique feature is the ability to reconfigure the return jacks as a mix buss insert.
- Build Quality: Reviewers consistently praise the top-notch, robust metal construction and the logical, spacious layout of the controls.
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