Union Audio FOUR.VALVE Signature-Series
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Union Audio
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A Signature Edition at the Top of the Tube Mixer Range
Derived from the 2V and 4V versions, the Signature Series 4V pushes high-end analog engineering further with a luxurious modern-retro design. Blue and white channel indicators inspired by the elara.6, metal chassis, and wooden trims emphasize a character that is both exclusive and timeless. Audio refinements-refined RIAA, parallel VCA, MUSES01-maximize transparency while preserving the organic warmth of tubes.Who Is It For and What Are Its Uses?
Designed for demanding DJs, audiophiles, and premium sound engineers, the 4V shines in clubs, listening bars, studios, or high-end mobile setups. Its warm and detailed sonic signature enhances house, disco, and techno sets as well as precise vinyl listening. Robust and reliable, it integrates equally well in fixed installations or touring performances.Features and Innovations
Each channel features dedicated phono and line inputs, an independent effects send, and a musical 3-band EQ that respects the character of the tubes. The Innofader crossfader, dual analog VU meters, and powerful headphone amplifier (split cue, cue/mix) ensure precise monitoring. On the outputs side, the master in balanced XLR, booth in 6.3 mm jack, and record output in RCA, with separate level controls, offer flexible integration into PA systems or studios. The included Mix.R linear power supply stabilizes the soundstage and improves dynamic headroom. Fully 100% analog, the 4V relies on no software and prioritizes immediate ergonomics for mixing.Technical specifications
| Type | Analog |
| USB stereo recording / playback | No |
| Number of faders | 4 |
| Rackable | No |
| Per channel inputs | dedicated phono and line (RCA) |
| Outputs | balanced Master XLR, Booth 6.3 mm jack, Record RCA |
| Headphones | 6.3 mm jack and 3.5 mm mini-jack |
| Separate level controls | Master, Booth, Aux Return |
Questions frequently asked
What sound does the Union Audio FOUR.VALVE Signature-Series tube mixer deliver?
The 100% analog circuit combines tubes, parallel VCAs, and MUSES01 components. A refined RIAA is provided for vinyl sources. The 3-band equalizer preserves the character of the tube circuit.
Can turntables and line players be connected on each channel?
Each channel features dedicated phono and line inputs on RCA. An independent effects send is also available on each channel.
What audio outputs are available?
For playback, the master uses balanced XLRs, the booth outputs use 6.3 mm jacks, and the recording output is an RCA, with separate Master and Booth level controls.
How does headphone cueing work on this mixer?
Monitoring is done via 6.3 mm jack or 3.5 mm mini-jack. Cue/mix control and split cue are integrated. The headphone amplifier is reported as powerful.
Is the Union Audio FOUR.VALVE Signature-Series USB compatible or rack-mountable?
This console does not offer stereo USB recording or playback. It is not rack-mountable and operates without software thanks to its fully analog architecture.
