Puritan Audio Laboratories
Ground Master City Ultra
Ground conditioner

Unlock your system’s full potential with GroundMaster City Ultra, Ground Line Noise Neutraliser

Puritan’s CITY MASTER ULTRA redefines advanced grounding technology to eliminate hidden noise… refining and significantly increasing the efficacy to provide the highest levels of ground line noise reduction achievable, thus enhancing clarity, dynamics, and detail – delivering true high-fidelity sound where installing a dedicated ground rod isn’t possible. Many audiophiles invest heavily in premium components – cartridges, DACs, preamps, amps, and speakers – to achieve superior sound. However, one critical element is often overlooked: the ground line. Ground forms half of the signal path, and without a clean, stable reference, even the finest equipment cannot deliver its full performance.

Ground is half of the signal that your HiFi is attempting to reproduce. The part that the “hot” side needs to refer to, to be accurate. The most expensive cartridges, DACs, pre-amps, amplifiers and speakers will not deliver a faithful performance if the ground is moving, shaking and wobbling with the noise that is always present on every ground line.

Why ground noise matters
Ground lines naturally carry noise—subtle interference that distorts the signal. This doesn’t always manifest as a hum or buzz but can mask detail, reduce dynamics, and flatten the soundstage. The result? A less immersive, less accurate listening experience, regardless of gear quality.

Introducing GroundMaster City Ultra
Building on the success of the original GroundMaster City, the GroundMaster City Ultra offers enhanced noise reduction, especially in environments where installing a dedicated ground rod is not feasible—such as apartments or urban settings. Compact and powerful, it integrates easily into any high-performance audio system, delivering cleaner, more detailed sound without the need for complex installations.

Simple, effective integration
Designed for flexibility, the ULTRA simply plugs into a spare wall outlet and works seamlessly with systems using Puritan power conditioners or similar power solutions. With all necessary cables included, setup is straightforward and results are immediate. The wall connection is to provide a final drain for the accumulated noise energies collected within the City Master Ultra. No power is drawn by the unit which should remain permanently plugged in. The second cable provided is for connection to the power distribution block or power conditioner serving your A/V set. For this to work, your power distribution block or power strip has to be equipped with an external ground connection (a 4 mm banana socket).

For audiophiles seeking true fidelity, the GroundMaster City Ultra is a game-changing upgrade—improving system integrity where it matters most.