The Gainlab Audio Auditor is a professional 500-series headphone amplifier designed to fit into a standard 500-series chassis, engineered for both studio and field applications. In the professional audio world, the 500-series format is often chosen by those who want their proven systems in a compact and easily portable form. Our experience shows that one of the most essential companions in such setups is a reliable headphone amplifier and the Auditor was designed with exactly this role in mind.

It is a high-power, crystal-clear sounding device that provides clear and unambiguous feedback about its operating conditions and characteristics, helping to protect both the user’s hearing and the connected headphones. Its main strengths are ultra-low distortion and a linear frequency response, combined with exceptionally large headroom. Thanks to its Class A design, it can drive headphones across a wide impedance range, delivering sufficient power. The connected headphones are protected against DC offset, overcurrent, and power-on transients. With its power and line-level indicators, operation remains predictable and fully reproducible. The unit also offers mono monitoring and an easily accessible mute function. Thanks to its 500-series format, the Auditor fits into any standard 500-series chassis. It is designed to pass the incoming line-level signal through the line outputs unchanged, allowing the signal to be daisy-chained for further monitoring or recording purposes.

The Auditor is designed to process line-level signals received via the rear input connectors of a standard 500-series chassis and deliver them to its headphone output. In addition, it passes the signal through to the rear output connectors of the standard 500-series chassis for further processing. This way, it can effectively drive a pair of monitor speakers or additional Auditor headphone amplifiers.