Audibax HA4000 v2 - 4-channel headphone amplifier with stereo/mono switch and ultra-compact form factor

Audibax HA4000 v2 - 4-channel headphone amplifier with stereo/mono switch and ultra-compact form factor

The Audibax HA4000 v2 is a multi-channel headphone amplifier designed to distribute the same mix to multiple listeners with quality and control. It integrates four independent amplification channels into a very compact 6 × 10.5 × 3.5 cm chassis, with 3.5 mm and RCA inputs for the main signal and 6.35 mm (stereo) outputs on each channel. Its electronics offer a maximum gain of 20 dB per channel , a maximum output level of +22 dB , and a signal-to-noise ratio >98 ​​dB , guaranteeing clean monitoring even in demanding passages. It includes a stereo/mono switch to adapt to different workflows and is powered by a 12–18 V DC adapter .

Main features

• 4 headphone channels: mix distribution for up to four users with independent control.
• Versatile inputs: 3.5 mm minijack and RCA for stereo source.
• Outputs per channel: 6.35 mm stereo jack.
• Stereo/mono switch: useful for quick mono compatibility checks and studio workflows.
• Audio performance: +22 dB maximum level, 20 dB gain per channel, >98 dB SNR.
• Ultra-compact design: 6 cm (depth) × 10.5 cm (width) × 3.5 cm (height) for installation on a desktop or rack shelf .
• Safe power supply: 12–18 V DC via adapter.

Product benefits

• Hassle-free simultaneous monitoring: ideal for home studios, podcasts, and classrooms; each listener adjusts their level without affecting the others.
• Easy integration: connect it from line outputs of consoles, interfaces or players via RCA or 3.5 mm.
• Sound consistency: low noise and sufficient gain margin for various headphones.
• Space saving: reduced size that leaves your work surface free.

Use cases

• Recording and mixing in studios and home studios .
• Podcast and content creation with guests.
• Music schools, production classrooms and AV labs.
• Reference rehearsal and playback rooms for bands.

Frequently Asked Questions

• Can I connect the source via minijack or RCA? Yes, it has both input options for the stereo signal.
• Can it be used to check mono mixes? Yes, it includes a stereo/mono switch for quick checks.
• What type of headphones does it support? It works with most headphones with a 6.35 mm jack (use an adapter if your headphones are 3.5 mm). The minimum load impedance per channel is 10 Ω.
• Does it include a power supply? It is powered by a 12–18V DC adapter (check the package contents according to the distributor).

Connections and handling

• Typical route: connect the line output of your interface/console to the 3.5mm or RCA input; assign each musician a headphone channel and adjust levels independently.
• Best practices: Start with low volume, gradually increase to a comfortable level, and avoid overloading the input to maintain optimal SNR.

Project description

4-channel headphone amplifier with 3.5 mm and RCA inputs; outputs per channel on 6.35 mm stereo jack; maximum gain 20 dB/channel; maximum output level +22 dB; signal-to-noise ratio >98 ​​dB; input impedance 1 MΩ; minimum output impedance 10 Ω per channel; power supply 12–18 V DC; dimensions 6 × 10.5 × 3.5 cm; stereo/mono switch; black color.