Union Audio four.valve Signature Edition Rotary Mixer

The hand-crafted “Signature” variants of our highly regarded Valve Series are designed for the audio purists, professional DJ and hi-fi enthusiast, who demand the rich character of valve (tube) technology along with an unrivalled sonic, tactile, and visual experience.

Product Description
The Signature Series blends valve circuitry with cutting-edge analogue design, each mixer featuring high-quality phono and line inputs across all channels for versatile integration with all conventional audio sources, and the silky-smooth, highly damped rotary fader assembly from our flagship Orbit.6, which ensures precise level adjustment for a seamless mix.  An Innofader crossfader, a natural sounding 3-Band EQ, and an easy to use, intuitive interface, add to a mix tool capable of creating dynamic, engaging mixes with ease.

At the heart of the Signature series lies the unique valve circuitry incorporated on every channel, rich in second order harmonics and capable of natural soft compression when driven hard, they deliver an immersive sonic experience, full of warmth, yet detailed and involving.

The RIAA input stages have been further refined for vinyl reproduction, while paralleled channel VCAs offer increased dynamic range and reduced distortion, all feeding the fully balanced mix summing stage, taken care of by a pair of the legendary MUSES01 op-amps, these refinements elevating the already exceptional fidelity of the Valve Series.

The Signature Series exudes a luxury modern-retro vibe, built around a robust metal chassis, with CNC-machined, anodised aluminium bezels, a metallic bronze coloured faceplate, and hand-polished solid oak side trims, these mixers are perfect for high-end studios, sophisticated listening bars, or mobile DJ setups.

Additional Highlights
Versatile Connectivity: Dual phono/line inputs on each channel accommodate a wide range of audio sources, offering flexibility for any setup.
Intuitive Layout: A user-friendly design ensures quick operation and seamless transitions, tailored for professional performance.
Premium Power Supply: Each mixer includes the mix.R power Linear PSU as standard, delivering a truly audiophile system out of the box.
Stunning Aesthetics: Eye-catching blue and white channel metering, inspired by the elara.6, complements the luxurious build.
Experience the Union Audio Signature Series and redefine your DJ sets with the perfect fusion of valve warmth, precision engineering, and elegant design. Crafted to meet the demands of the modern DJ, these mixers are a testament to over eight years of innovation and passion.

Specifications:

Distortion + Noise (THD+N) Un-weighted
0 dBu, 20 Hz to 20 kHz, Line In to Mix Out +4 dBu: 0.1% Typically

Frequency Response
Line In to Mix Out: ±1 dB, 20 Hz – 50 kHz
RIAA Accuracy: ±1 dB, 20 Hz – 20 kHz

Shutoff and Crosstalk
Fader Shutoff: > -80 dB
L/R Crosstalk, Line In to Mix Out, 1 kHz: < -75 dB

Noise (22 Hz to 22 kHz, Un-weighted)
Residual Output Noise: < -92 dBu
Line In to Mix Out, Unity: < -85 dBu

Maximum Output Level (Mix Out)
0.5% THD: +27 dBu

Dynamic Range
Dynamic Range: 116 dB

EQ and Filter Frequency
Channel High-Pass Filter Fully Clockwise: -3 dB @ 1500 Hz
Master 3-Band Isolator: 200 Hz, 800 Hz, 2000 Hz

Headphone Amplifier
Maximum Output Level: 750 mW RMS @ 33 Ω

Power Supply
Type: External SMPSU
Mains Voltage Range: 90–260 VAC
Output: 18 V DC, 30–40 W
Efficiency: LEVEL VI