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Union Audio four.valve 4-channel Analog Rotary DJ Mixer

4-channel Analog Rotary Mixer with 3-band Master Isolator, Adjustable Crossfader, 4 x 3-band EQ, 4 x HPF, Per-channel Aux, Selectable Line/RIAA In, 2 x 3-pin Mic In, 1/4" Stereo Aux Out/Insert/Return, Split Mixing, 3-pin XLR Stereo Master Out, and 2 VU Meters
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Item ID: Valve4Rotar
Union Audio four.valve 4-channel Analog Rotary DJ Mixer
Price:$2,299 and 00 cents
Special Financing - Ends Aug 2, 2026. $64/month with 36 month financing*

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Union Audio four.valve 4-channel Analog Rotary DJ Mixer
Backordered - More On The Way! Notify me
Price:$2,299 and 00 cents
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This article was Written By

Our Product Research Team

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Rotary Magic, Analog Warmth, and Uncompromising Craftsmanship

Spanning DJ Kool Herc’s reign in The Bronx, the glam-fueled fervor of Studio 54, parties at Paradise Garage, and listening lounges around the globe, the rotary mixer has remained synonymous with premium playback. Now, Union Audio takes up the gauntlet of hi-fi heritage to deliver a 4-channel rotary DJ mixer that marries characteristic analog warmth with exceptional aural engineering. Enter, four.valve. Across its ergonomic and intuitive interface, each channel features a dedicated 3-band EQ and highpass filter alongside masterfully weighted rotary faders, ensuring not just hyper-precise sonic contouring but satisfying tactility. DJs at Sweetwater are enamored by the four.valve’s extensive options for interoperative integration, with each channel featuring selectable Line/Phono input modes, variable channel assignment, and stereo Aux inserts, the last of which enables boundless integration of external hardware or software effects, drums, processing, and more. The four.valve’s 3-band Master Isolator is your gateway to crafting hypnotizing transitions and malleable mixing. At the same time, the Innofader-designed crossfader has an adjustable contour, allowing you to tailor your DJing to suit your style. Left- and Right-channel VU meters are complemented by Split-mixing capabilities, with flexible connectivity options that culminate in a sonic landscape of indelible analog character and unwavering fidelity.

Union Audio four.valve Features:

  • Tube-driven circuitry ensures warm, analog musicality and premium sonic fidelity
  • Robust rotary faders guarantee ultra-detailed control and satisfying tactility
  • Interface layout features a DJ-focused design for intuitive use and ergonomic navigation
  • Master 3-band Isolator lets you expand your aural engagement for elevated mixing and transitions
  • Per-channel 3-band EQ and HPF support precise mixing and versatile sonic contouring
  • Variable channel assignments and Line/Phono operation provide flexible functionality with all your favorite audio media
  • Multimode stereo Aux send/insert/return capabilities allow for extensive interoperative integration with external software and hardware, alongside per-channel level controls
  • Innofader crossfader features adjustable crossfading profile for expanded control and personalized DJing
  • Split-mixing function is complemented by Master, Booth, and Phones level controls for flexible playback and performance configurations
  • Dedicated VU meters supply detailed real-time feedback for seamless mixing and blending

Warranty Info

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Tech Specs

  • Channels: 4-channel
  • Screen : 2 x VU Output Meters (left, right)
  • Analog Inputs: 2 x XLR, 4 x Dual RCA Stereo (line), 4 x Dual RCA Stereo (RIAA)
  • Analog Outputs: 2 x XLR (master), 2 x 1/4" TRS (booth), 2 x 1/4" TRS (aux), 1 x Dual RCA Stereo (record)
  • Headphones: 1 x 1/4" TRS
  • Other I/O: 2 x 1/4" Aux Return/Insert, 1 x Earth Terminal
  • Faders: 4 x Rotary Knobs
  • Crossfader: Stanard
  • EQs: 3-band Isolator
  • Power Source: 18V DC Power Adapter (included)
  • Manufacturer Part Number: UA-4VL-BLK-UNI

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Reviews

A great successor to the discontinued MasterSounds valve Mixers
The Union Audio Four Valve mixer is an absolute game-changer. As "a replacement" to the MasterSounds mixer designed with Andy Rigby-Jones, it had big shoes to fill—and it totally delivers. The sound is next-level, thanks to the valve circuitry that adds this beautiful warmth and depth to my music. Whether you're spinning vinyl or digital, everything just sounds richer and more alive.

The build quality is rock solid, with smooth rotary controls and a layout that feels super intuitive. It's clear this was made by people who actually understand what DJs and producers need. Plus, it looks stunning—this thing will turn heads in any booth or studio.

Union Audio has nailed it with the Four Valve. If you're serious about sound and want something that stands out from the crowd, this is the one. Highly recommended!
Music background: Veteran DJ / Producer