The Allen & Heath AV1059 is a professional dual-channel passive hum eliminator designed to remove unwanted AC line hum and buzz caused by ground loops in audio signal paths. Ground loops are a common problem in audio systems where multiple pieces of equipment are connected to different AC power outlets, creating a difference in electrical potential that manifests as a low-frequency hum (typically 50Hz or 60Hz) in the audio. The AV1059 solves this by using high-quality audio transformers to provide complete galvanic isolation between the input and output of each channel. This breaks the ground loop path, eliminating the hum while preserving the integrity of the audio signal.

Engineered for simplicity and reliability, the unit is a passive device requiring no external power. It features two independent channels, each with an XLR female input and an XLR male output. The transformers are carefully designed to maintain a wide frequency response and handle professional line-level signals without introducing distortion or significant signal loss. Its compact, rugged metal housing makes it ideal for permanent installation in equipment racks or for inclusion in a portable toolkit. The straightforward design means there are no controls or settings; users simply connect it in-line with the problematic signal path.

The Allen & Heath AV1059 is an essential problem-solving tool for live sound engineers, system integrators, and recording studio technicians. It is commonly used to clean up signals between mixers and powered speakers, between computers and PA systems, in recording setups, and in any installed audio system where unexplained hum appears. By providing a reliable and transparent method of eliminating ground loop noise, it ensures clean, professional audio quality in complex system configurations.