Behringer HD400

A Mini Format with a Major Role in a Clean Audio Chain

Hum and background noise issues do not always come from the "main" equipment: they often appear when connecting multiple devices powered by mains, with grounds interacting with each other. The HD400 fits precisely into this smart troubleshooting logic: a discreet, easy-to-integrate tool designed to restore order in an audio setup without changing your workflow.

Thanks to its simple and straightforward approach, it naturally positions itself as a small "session-saving" link: the one you add when a setup causes annoying hum, when a computer, mixing console, PA system, or recorder introduces a buzz, or when a correctly configured system becomes noisy due to a ground loop.

Who Is the HD400 For and When to Use It?

The HD400 is aimed at anyone who wants clean sound without embarking on endless diagnostics: home studio musicians, technicians, DJs, small PA users, content creators, or anyone connecting multiple audio sources and destinations daily.

It is especially useful as soon as you notice a constant hum, residual noise related to power supply, or a noise difference when plugging/unplugging certain devices. Its benefit is as practical as it is musical: reducing noise improves clarity, perceived dynamics, and overall quality of a recording or broadcast, without having to "mask" the problem with EQ or processing.

Key Features: Hum Suppression and Unbalanced/Balanced Conversion

Ground Loop Elimination and Mains Noise Reduction

The HD400 is designed to effectively get rid of hum caused by alternating current and residual noises that appear when interconnecting devices. By eliminating ground loops, it helps restore a quieter and more stable signal, which immediately results in a more pleasant listening experience and cleaner recordings.

The goal is clear: preserve signal integrity without compromise while removing the most common cause of hum in interconnected audio systems.

Automatic Unbalanced to Balanced Conversion

Another strong point of the HD400: it automatically converts unbalanced signals to balanced signals without signal loss. This conversion can be very useful in many practical cases, for example when connecting equipment with different noise levels or wiring schemes, or when seeking a cleaner connection in a setup prone to noise.

Two Channels: Two Mono or One Stereo

With its 2 channels, the HD400 is comfortable handling both two mono lines or one stereo signal. It is a convenient format for multiple scenarios: securing a stereo monitor mix, processing two independent sources, or stabilizing a link between devices. Its balanced jack inputs and outputs ensure simple integration into various audio chains, from studio to stage.

Technical specifications

Number of channels	2	Category	audio converter
Rackable	No	Type	Box

Function	suppression of residual audio noise and hum caused by alternating current	Signal loss	none (as per specified design)
Use	two mono signals or one stereo signal	Inputs	2 (balanced jacks)
Conversion	automatic conversion of unbalanced signals to balanced signals	Outputs	2 (balanced jacks)