Description
Download Manual The EZ-HDA4AX is a compact stereo headphone distribution amplifier designed to feed four independent headphone outputs from a single stereo source. It provides reliable level control and low-noise amplification in a small 1/3-rack form factor. The unit is intended for critical listening environments where multiple operators or listeners require individual volume control.
Each of the four front-panel outputs is driven separately and includes its own LEVEL control for precise adjustment. Inputs are unbalanced and available on rear-panel RCA jacks plus a front/back-compatible stereo mini-jack and a 1/4″ TRS jack. Gold-plated RCA connectors ensure secure, low-resistance input connections and stable signal transfer.
Performance specifications include a wide frequency response from 20 Hz to 50 kHz and low distortion, with THD+N below 0.1% at typical headphone output levels. Crosstalk is specified at less than -75 dB at 1 kHz which preserves stereo separation across all outputs. The unit delivers 60 mW into a 100 ohm load per stereo output and maintains noise below -95 dB at maximum gain.
Connectivity covers stereo inputs on dual RCA, a stereo mini-jack, and a 1/4″ TRS input, while the front panel provides four stereo mini-jack headphone outputs for quick access. The input sensitivity varies by connector type to accommodate consumer and pro-line level sources. Power is supplied by an external 24 Vdc adapter and current draw is modest, keeping heat and power demands low.
Typical applications include studio monitoring stations, retail listening demos, worship audio distribution, and museum or exhibit audio systems where multiple listeners require individual volume control. The EZ-HDA4AX is also suited to home component systems and commercial installations where a compact, dedicated headphone distribution solution is required. It is engineered to integrate into racks or small console spaces using its 1/3-rack width enclosure.
The chassis and controls are built for repeated use, with tactile knobs for easy level adjustment and durable front-panel mini-jack outputs. Installation is straightforward; connect a single stereo source and power the unit, then insert headphones and set levels. The combination of simple setup, reliable electronics, and low noise performance makes the EZ-HDA4AX an effective choice for multi-listener headphone distribution.