Gainlab Audio Auditor: Reference Headphone Monitoring for the 500-Series

Published 02 February 2026

The Gainlab Audio Auditor is a professional-grade 500-series headphone amplifier designed for engineers who demand uncompromising accuracy in both studio and field environments. Built to fit seamlessly into any standard 500-series chassis, the Auditor answers a common need in compact modular systems: a powerful, transparent, and dependable headphone monitoring solution.

The 500-series format has long been favored by audio professionals who want to condense proven signal chains into portable, efficient setups without sacrificing performance. In such systems, a high-quality headphone amplifier is not a luxury but a necessity. The Auditor was conceived specifically for this role, delivering reference-level monitoring wherever a 500-series rack can go.

At its core, the Auditor is a high-power, crystal-clear headphone amplifier engineered for absolute sonic accuracy. Ultra-low distortion and a linear frequency response ensure that what you hear is an honest representation of the signal, while exceptionally large headroom allows the unit to handle demanding dynamic material with ease. Its Class A design enables it to drive headphones across a wide impedance range, providing ample power without strain or coloration.

Beyond sound quality, the Auditor places strong emphasis on safety and operational clarity. The unit provides clear visual feedback through dedicated power and line-level indicators, making operation predictable and fully reproducible. Integrated protection circuits safeguard both the user’s hearing and connected headphones, guarding against DC offset, overcurrent, and power-on transients.

Practical monitoring features further enhance its usability. Mono monitoring and a conveniently accessible mute function support critical listening and workflow flexibility in professional environments. In addition, the Auditor passes the incoming line-level signal through its line outputs completely unchanged, allowing easy daisy-chaining for additional monitoring paths or recording destinations.

Compact, powerful, and meticulously engineered, the Gainlab Audio Auditor is a purpose-built headphone amplifier for modern 500-series systems – delivering precision monitoring, robust protection, and seamless integration wherever accuracy matters most.

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