HA400 Headphone Amplifier, Ultra Low Noise, Stereo Audiophile Preamp, 4 Amplification Channels, Ultra Compact Preamp, For Studio, Stage Use, Plug And Play

HA400 Headphone Amplifier

The HA400 is an ultra-compact four-channel stereo headphone amplifier that turns one stereo source into four independent headphone feeds. Each of its four amplifier sections has its own volume control, so four listeners can share a mixer output, an audio interface, a computer or a stereo system and each set a comfortable level without affecting anyone else. The unit is built in a metal enclosure finished in silver, needs no software or drivers, and is ready to work as soon as the supplied power adapter is connected: feed it a stereo signal, plug in the headphones and adjust the four knobs.

Key features

• Four independent stereo amplifier channels from one stereo source
• Individual volume control for every headphone output
• Ultra-low-noise design that keeps quiet passages clean
• Minimal distortion even at high volume settings
• No signal loss when all four headphones are connected
• Rugged metal construction in a silver finish
• Plug and play operation with no software or setup

Amplifier, not a splitter

A passive splitter divides one headphone output four ways and leaves every listener sharing the same volume and the same weakening signal. The HA400 works differently: each output is driven by its own amplifier section, so one listener turning up does not pull the level down for the others, and the source keeps its clarity with all four outputs loaded. That distinction matters in practice. A singer who monitors loud, an engineer who works quietly and a producer who sits between the two can all work from the same mix at the same time, each hearing it at the level their ears and their headphones need.

In the studio and on stage

Tracking sessions are the classic use: a band recording together needs to hear the same backing and cue mix, and running four headphones from the single headphone socket on an interface is not an option without a distribution amplifier. The HA400 also serves rehearsals and live stage monitoring, where several musicians share one stereo monitor feed, and it is equally at home outside music, feeding two to four listeners from a television, a computer with more than one listener, or a stereo amplifier in a shared room. Its compact footprint sits on a desk, a mixer bridge or a rack shelf without claiming space the session needs for other work.

Simple by design

There are no menus, no presets and nothing to configure. The controls are the four volume knobs and the connections are standard headphone jacks, with a stereo input for the source and four stereo outputs for the listeners. The metal case and firm controls stand up to repeated transport and daily studio traffic, and the shiny control knobs are easy to find by touch in a darkened control room or wings position. Because the amplifier sections are built for low noise, the background stays quiet during pauses and quiet passages, which is exactly when a noisy headphone feed becomes impossible to ignore.

What is in the box

The package contains one HA400 headphone amplifier, one power adapter and one user manual. Connect the adapter, run a stereo lead from your source to the input, and the unit is ready. It suits engineers, band leaders, podcast teams and home listeners who need a simple, dependable way to expand a single stereo output into four properly driven headphone connections, in the studio, on stage or around a shared screen at home.

Four listeners, one source, four independent levels and no fuss: the HA400 headphone amplifier does one job and does it cleanly, wherever a single headphone socket is not enough.