Audibax HA4000 - 4-channel headphone amplifier with 3.5mm/RCA inputs and 6.35mm jack outputs

Audibax HA4000 - 4-channel headphone amplifier with 3.5mm/RCA inputs and 6.35mm jack outputs

The Audibax HA4000 is a compact and robust headphone amplifier designed to distribute a single mix to four listeners with consistent quality. It features dual input formats (3.5 mm stereo mini-jack and RCA) for seamless integration into home studios, rehearsal rooms, classrooms, or rental spaces. Each channel operates with a maximum gain of 20 dB and a signal-to-noise ratio > 98 dB , delivering a clean level with ample dynamic range. The 6.35 mm TRS outputs (one per channel) and a minimum output impedance of 10 Ω per channel ensure compatibility with a wide range of headphones. Its blue steel chassis is designed to withstand heavy use in fixed installations and on-the-go work. A power adapter is included for immediate use.

Main features

• 4 listening channels to distribute the same signal to multiple users simultaneously.
• Inputs : 3.5 mm stereo minijack and RCA pair (line format).
• Outputs : 4 × 6.35 mm stereo jack (TRS) , one per channel.
• Input impedance : 1000 kΩ (1 MΩ).
• Output impedance : 10 Ω minimum per channel.
• Maximum gain : 20 dB per channel.
• Maximum output level : +22 dB .
• Signal-to-noise ratio : > 98 dB .
• Power supply : adapter included .
• Construction : steel , blue color , desktop format.
• Applications : rental and installation , home studio, education, podcast and rehearsal rooms.

Product benefits

• Easy multi-user monitoring : distribute a reference mix to four performers, students, or podcast guests without added latency or routing hassles.
• Immediate compatibility : 3.5mm and RCA inputs eliminate the need for adapters when connecting from interfaces, players, or mixers.
• Clean and powerful signal : SNR > 98 dB and gain per channel up to 20 dB allow for clear listening even in soft passages.
• Built for real work : rugged metal chassis and standard 6.35 mm connectors for continuous use.

Use cases

• Personal studio : sending the main mix to musicians and producer during recordings.
• Podcast and streaming : provide monitoring for presenter and guests with convenient control per channel.
• Education and training : simultaneous listening to class material without contaminating the classroom.
• Fixed installations and rental : audio distribution in booths, rehearsal rooms, academies or multi-user spaces.

Frequently Asked Questions

How many exits does it have?
It has four 6.35 mm stereo jack headphone outputs , one per channel.

Can I connect sources via minijack or RCA?
Yes. It offers two physical input formats for the same program signal: 3.5 mm stereo or RCA.

Does it include a power supply?
Yes, the power adapter is included in the box.

Does it work with any type of headphones?
It is compatible with most headphones with a 6.35 mm TRS connector. Perceived performance may vary depending on the impedance and sensitivity of each model.

Usage recommendations

• Work with appropriate line levels at the input to optimize SNR and avoid saturation.
• If you use headphones with a minijack, use a quality 3.5 mm → 6.35 mm adapter to preserve the connection.
• Organize the wiring to prevent pulling on connectors and preserve mechanical integrity.

Project description

4-channel headphone amplifier; 3.5 mm stereo and RCA inputs; 6.35 mm TRS outputs (4); 1000 kΩ input impedance; 10 Ω minimum output impedance per channel; 20 dB maximum gain per channel; +22 dB maximum output level; >98 dB signal-to-noise ratio; includes power adapter; steel chassis, blue color.