NEW Union Audio FOUR.VALVE Rotary Desktop DJ-Mixer

Union Audio FOUR.VALVE Rotary Desktop DJ Mixer

The Union Audio FOUR.VALVE is an uncompromising 4-channel analog rotary mixer with real tube technology (Valve). It combines the timeless warmth of classic valve circuitry with modern DJ performance and precision manufacturing. Designed and built in Cornwall, UK, the FOUR.VALVE is aimed at discerning vinyl DJs, audiophile club installations and professional studio setups.

Authentic tube sound - fully analog

At the heart of the FOUR.VALVE is a precisely tuned tube circuit per channel that adds depth, harmonic warmth and musical character to any mix. The fully analog signal routing ensures a dynamic, organic sound - even with long sets, the sound remains powerful and rich in detail.

Four channels with maximum flexibility

Each channel has a separate phono preamplifier and a line input (RCA) so that vinyl and digital sources can be flexibly combined. The Alps Rotary faders guarantee smooth transitions with an excellent feel, while the integrated Innofader crossfader offers additional performance options.

Precise sound shaping & master isolator

The detailed 3-band EQ per channel enables targeted interventions without losing the typical tube character. The master section features a 3-band isolator with crossover frequencies at 200 Hz, 800 Hz and 2000 Hz - ideal for powerful breakdowns and creative transitions.

Effect integration & professional connections

External effect devices can be integrated via the aux send/return (2× 6.3 mm TRS). Separate controls for Master Out, Booth Out and Aux Return ensure precise control. The mixer offers balanced XLR master outputs, Booth Out (TRS) and Record Out (RCA).

Monitoring & processing at top level

Two illuminated analog VU meters enable precise level monitoring. The powerful headphone amplifier (750 mW RMS @ 33 Ohm) supports split cue and cue/mix control. The robust metal housing underlines the high-quality construction for continuous professional use.

Conclusion: Tube warmth for modern DJ performances

The Union Audio FOUR.VALVE is the perfect choice for DJs who want to combine analog tube warmth with precise rotary performance. A high-end mixer for clubs, studios or exclusive events - uncompromising in sound, feel and workmanship.

Features:

• 4-channel analog rotary mixer with tube technology (Valve)
• Phono preamp and line inputs (RCA) per channel
• High-quality and detailed 3-band EQ control without loss of the typical tube sound
• High-quality crossfader from Innofader
• Aux control per channel for effects devices via send/return with 2x 6.3 mm jacks
• Precise Alps rotary faders for smooth transitions and optimum feel
• Separate level controls for Master Out, Booth Out and Aux Return
• Two illuminated analog VU meters for reliable signal monitoring
• Powerful headphone amplifier with split cue and cue/mix control
• Universal headphone connections: 6.3mm (1/4") and 3.5mm jack
• Flexible outputs: Master-Out balanced XLR, Booth-Out with 6.3mm jack, stereo RCA for Record Out.
• Analog circuitry and components for classic, warm sound
• High build quality and robust metal housing for reliable use in the club, studio or home setup

Technical data

• Number of channels: 4
• Signal routing: Fully analog
• Tube technology: Precisely tuned tube circuit (valve) per channel
• Phono preamplifier: Integrated per channel
• Fader: Precise Alps rotary fader
• Crossfader: High-quality Innofader
• EQ: 3-band EQ per channel, rich in detail without losing the tube sound
• Aux control: Per channel for effect devices
• Isolator (master): 3-band isolator with crossover at 200Hz, 800Hz, 2000Hz
• Phono inputs: 4x cinch (RCA)
• Line inputs: 4x cinch (RCA)
• Aux send/return: 2x 6.3 mm jack (TRS)
• Master Out: 2x XLR balanced
• Booth Out: 2x 6.3 mm jack (TRS)
• Record Out: 2x Cinch (RCA)
• Headphone connections: 6.3 mm and 3.5 mm jack
• Headphone output power: 750 mW RMS at 33 Ohm
• Headphone functions: Split cue, cue/mix control
• Total harmonic distortion (THD+N): 0.1 % typical (unweighted, 0 dBu, 20 Hz-20 kHz)
• Frequency response Line In → Mix Out: ±1 dB from 20 Hz to 50 kHz
• RIAA accuracy: ±1 dB from 20 Hz to 20 kHz
• Fader attenuation (shutoff): > -80 dB
• Channel crosstalk (crosstalk): < -75 dB at 1 kHz
• Residual noise (output): < -92 dBu (22 Hz - 22 kHz, unweighted)
• Noise Line In → Mix Out (Unity): < -85 dBu
• Maximum output power (Mix Out, 0.5% THD): +27 dBu
• Dynamic range: 116 dB
• High-pass filter: -3 dB at 1500 Hz (fully turned up)
• Power supply type: External switching power supply unit (SMPSU)
• Input voltage: 90-260 VAC
• Output: 18 V DC, 30-40 W
• Efficiency: LEVEL VI
• Housing: Robust metal housing
• Level meters: Two illuminated analog VU meters
• Origin: Made in the UK
• Mixer dimensions: 35.0 x 10.0 x 28.3 cm (incl. controls, WxHxD)
• Mixer weight: 4.75 kg

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