RF•STOP Isolation Box

RF•STOP Isolation Box

Regular price $3,995.00 Sale

RF•STOP™ Isolation Box is the only solution to definitively stop radiated radio-frequency (RF) noise from impinging on a Digital-To-Analog Converter (DAC). It achieves complete RF isolation by enclosing components inside a Faraday box and minimizing galvanic signal connections. This may sound extreme but the result is endgame: total transparency to the source; an analog smoothness with incredible detail and dynamic range; a huge soundstage; and a completely fatigue-free listening experience.

The evidence is empirical. Out-of-band RF noise measured at a DACs output is a direct corollary for sound quality and confirmed by listening tests. Proximate digital components radiate RF noise that is picked up by a DAC and measurable at the outputs. This RF noise manifests within the audio band as harmonic distortions and an elevated noise floor. So, while signal and power isolation are certainly important for sound quality, for those with the most revealing systems and highest appreciation for musical transparency, it's necessary that radiated RF noise must also be isolated.

RF•STOP Isolation Box is used to isolate digital components upstream of the DAC—source/streamer, up-sampler, optical converter and networking. Please see the example configuration drawing. RF•STOP Isolation Box provides 90dB performance to block 99.9999999% of RF noise—an equivalent electromagnetic shielding distance of 500 meters. Components placed inside are quarantined from being affected by, or affecting, outside components. Signals are ported through a hybrid waveguide using optical connections, where possible, to minimize RF leakage. AC power is provided by a single RF filtered IEC inlet (100v-250v) and an internal NEMA plug adapter supports SCHUKO, UK, AUS or other standards. RF•STOP is sized to accommodate a variety of component configurations and an optional mezzanine shelf here allows convenient stacking. For cooling, RF•STOP has passive-flow venting with optional fans as required.

With RF•STOP Isolation Box, digital tweaks become unnecessary. Expensive sources, isolated switches, USB re-clockers or exotic digital cables provide no further RF reduction benefit when a DAC is already fully isolated. This is a huge win-win for audiophiles who can be objectively confident in their digital endgame and wisely spend only on components of intrinsic value. Alas, RF•STOP still allows room for aesthetics: elevate the appearance of its professional-grade RF isolation with a solid wood faceplate here to match your audio furniture.

RF•STOP Isolation Box is built to order; please allow 4-6 weeks for delivery.


  • RF•STOP Isolation Box
  • RF isolation test certificate (each unit is fully tested for 90dB isolation)
  • AC Power Cord (NEMA). A companion RF•STOP filtered power cord here is highly recommended.
  • NEMA to international plug adapter as required
Download the RF•STOP Isolation Box Whitepaper here for an overview of radiated RF's impact on your DAC.