Pricing and availability

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Average Price: $2,299

High-end/Boutique

$100

$601+

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Price History

Based on price data from 1 merchant for "Union Audio four.valve 4-channel Analog Rotary DJ Mixer". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

Step into the world of seamless mixing with the Union Audio four.valve 4-channel Analog Rotary DJ Mixer, where tube-driven circuitry meets timeless design. This mixer is crafted for DJs who demand both precision and warmth in their sound. Each of the four channels offers a dedicated 3-band EQ and highpass filter, allowing you to sculpt your audio landscape with finesse. The robust rotary faders are not only a joy to use but ensure your mixes are as smooth as they are dynamic.

Beyond its tactile controls, the four.valve is designed for maximum versatility. With selectable Line/Phono input modes and stereo Aux inserts, you can easily integrate external hardware or software for a personalized touch. The mixer’s Innofader-designed crossfader with adjustable contour lets you tailor the setup to your style, whether you’re laying down seamless transitions or creating bold, punchy cuts.

To top it off, the 3-band Master Isolator enables you to craft hypnotic transitions that captivate any audience. Real-time feedback is at your fingertips with dedicated VU meters and split-mixing capabilities, ensuring your performance remains flawless. Whether you're a seasoned professional or an aspiring DJ, the four.valve offers an unparalleled blend of vintage sound and modern functionality.

Key Features:

  • Tube-driven circuitry for warm analog sound
  • 4 channels with dedicated 3-band EQ and highpass filter
  • Robust rotary faders for detailed control
  • Selectable Line/Phono input modes
  • Multimode stereo Aux send/insert/return
  • Innofader crossfader with adjustable contour
  • 3-band Master Isolator for enhanced transitions
  • Split-mixing and real-time VU meters for seamless performance

Product 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 2 x Rotary Knobs
Crossfader Stanard
EQs 3-band Isolator
Power Source 18V DC Power Adapter (included)

FAQs

What type of inputs does the Union Audio four.valve DJ Mixer support?

The Union Audio four.valve DJ Mixer supports 2 XLR inputs, 4 dual RCA stereo line inputs, and 4 dual RCA stereo RIAA inputs, providing versatility for various audio sources.

Does the Union Audio four.valve DJ Mixer have a built-in crossfader?

Yes, the Union Audio four.valve DJ Mixer features a standard crossfader, allowing for smooth transitions between channels during a DJ set.

What kind of power supply does the Union Audio four.valve DJ Mixer require?

The Union Audio four.valve DJ Mixer requires an 18V DC power adapter, which is included with the mixer.

Can I use the Union Audio four.valve DJ Mixer for both booth and master outputs?

Yes, the mixer has separate outputs for master (2 x XLR) and booth (2 x 1/4" TRS), allowing you to manage sound levels in different environments.

What are the EQ capabilities of the Union Audio four.valve DJ Mixer?

The Union Audio four.valve DJ Mixer is equipped with a 3-band isolator EQ, enabling precise control over the frequency spectrum for each channel.

Reviews

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Union Audio four.valve 4-channel Analog Rotary DJ Mixer.

Features and functionality

  • Union Audio four.valve includes a crossfader, allowing for quick cuts, enhancing versatility compared to other rotary mixers without this feature.

    Source
  • The HPF on the MK2 version is subtle until the 12 o'clock position, where it begins adding resonance and boosting higher frequencies.

    Source
  • The aux knob functions as the send/return, similar to other Union Audio and Master Sounds mixers.

    Source
  • The SOA BEM OLHO 2R, chosen by one user, is praised for customization and specific EQ frequency choices, with peak frequencies at 50, 1k, and 20k.

    Source

Setup and maintenance

  • Owners suggest setting channel pots to full for unity gain, rather than relying on EQs for volume adjustments, ensuring consistent sound levels.

    Source

Use cases and applications

  • Users found the mixer effective in a hi-fi bar setting, balancing sound quality with appropriate volume for dining environments.

    Source
  • The Ecler Warm 4 is highlighted for its warm sound and traditional layout, making it suitable for users seeking classic rotary mixer design.

    Source

User experience

  • The EQs on the Union Audio four.valve are described as more subtle compared to Pioneer mixers, requiring adjustments in usage approach.

    Source
  • Owners note the need to adjust gain and channel faders properly to avoid unintentional sound competition through EQ and isolator settings.

    Source
  • One owner of the Omnitronic trm-202 mentions channel bleed issues, emphasizing the importance of reaching out to manufacturers for support.

    Source

Comparisons

  • Users compare Union Audio four.valve's crossfader feature to older rotary mixers like the Vestax PMC-46 and Rane MP2016's optional expansion.

    Source
  • The UA version is visually similar to the Master Sounds MK2 Valve, with the primary differences being in logos and minor label changes.

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  • The Union Audio four.valve is likened to the Allen & Heath Xone of rotary mixers due to its availability and robust build, making it a commercial-grade choice.

    Source
  • The ARS Model 1100 and Resor 2525M are noted as alternatives with comparable specs, though potentially affected by exchange rates.

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  • Users often compare the MasterSounds radius 4+fx unit to Condesa or E&S mixers, noting preferences in sound and design aesthetics.

    Source

Build quality

  • It's noted that the knobs and pots are ALPS, known for their reliability and smooth operation in audio equipment.

    Source

Based on 0 Reviews and 0 Ratings

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