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Acoustic Revive RHR-21 review at MONO & STEREO magazine
Acoustic Revive is one of the most prolific high-end audio manufacturers when it comes to dedicated, well-designed, and inventive accessories.
Designed by Ken Ishiguro, these accessories always go a step further than expected. Most of the time they are operating on the fringe of science, but I have not been disappointed by any of these Japanese products and I have had the opportunity to test, listen to, and review quite a few Acoustic Revive products over the years.
RHR-21
RHR-21 follows Ken Ishiguro research in the realms of Helmholtz-resonance theory.

Helmholtz resonance is the term for the phenomenon of air resonance in a cavity, named after the German physicist Hermann von Helmholtz. This resonance occurs when air is forced to move in and out of a closed space, causing the air to vibrate at a certain natural frequency. This principle can often be observed in everyday life, for example when air is blown across the opening of a bottle, resulting in an unmistakable resonant sound.

However, to make the best use of Helmholtz resonance, it is necessary to determine exactly where the cavity ends and the throat begins and how these aspects affect both the high and low resonant frequencies. How important is this distinction?
Complete review for Acoustic Revive RHR-21 at MONO & STEREO magazine

Acoustic Revive RHR-21 Acoustic Resolution Exciter
Standing-wave & flutter echo remover: a revolutionary in-room tuning solution that dramatically improves room acoustic resolution and phase characteristics.
The Acoustic Revive RHR-21 Acoustic Resolution Exciter is a high-performance audio accessory designed to significantly enhance the resolution and clarity of audio playback. By utilizing advanced acoustic excitation technology and effective vibration control, the RHR-21 improves the ability to hear fine details and achieve a more accurate sound reproduction. Its premium construction and versatile application make it a valuable addition to any high-fidelity audio system, offering both audiophiles and professionals a means to refine and elevate their listening experience.
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