Acoustic Revive products don't frequently show up on Audiogon because they work so well. The RR-77 Ultra Low Frequency Generator works by using the Schumann Resonance to minimize the adverse effects of EMI and RFI. Here what the respected audio reviewers think:
Jeff Day with 6 Moons Audio Magazine: "The RR-77 pulls off a real magic act in accentuating the musicality of a recording and hifi rig. The non-musical elements of the recording process such as soundspace, soundstaging, imaging, extreme detail recovery and so forth all have a dollop of naturalness applied to them so that they don't distract you from the musical elements of tone, melody, rhythm, emotional impact and musical flow. Those non-musical artifacts are still there but now in complete support of the music to never draw your attention away from the music as some audiophile-style systems tend to do. With the RR-77 doing its little magic act, I can listen all day long with zero listening fatigue. If anything, a listening session becomes energizing and edifying and when a long nocturnal session is over, I feel refreshed. Did I mention that audio pals Pete Riggle and Stephæn Harrell both bought one of these devices after giving it a listen? They did. And you just know that mine's not going anywhere."
6 Moons Blue Moon Award for 2008
Dave Clark with Positive Feedback Magazine: "Yeah, it works. I hear the same as Jeff and all the rest: improved spatial ambiance, a bigger grander more holographic soundstage/soundfield, and a greater sense of ease or naturalness to the music… yeah it works as advertised.
Stereo Times Most Wanted Components - Accessories 2008.