Brand new, never used! One Acoustic Revive RR-888 Ultra Low-frequency Pulse Generator, the current version. We opened the box for taking pictures only. The “Schumann Resonance” is a resonance frequency that exists in the Earth’s “electromagnetic” cavity; i.e. between terrestrial surface and ionosphere. German physicist W.O. Schumann first detected the resonant properties of this terrestrial cavity in 1954. It is said that the Schumann Resonance is a breathing phenomenon of the Earth that is lasting from old time of the Earth creation and is giving a positive effect to the human brain. Humans, animals and plants have become accustomed to this frequency of 7.83Hz over a very long period of evolution. But recently, many unnatural radio waves and electromagnetic waves disturb this frequency of 7.83Hz, it has changed the influence that it has on us. Research was started from the point of view that (If Schumann Resonance Waves have a positive effect on the human brain, how does it react to human hearing?), it became clear that there was a surprising effect to both of hearing and sight. Then, Acoustic Revive developed and manufactured a device to generate the 7.83Hz electric wave artificially, the Ultra-low Frequency generator RR-888. The RR-888 changes your listening room to the sound field without muddiness and fills it with a feeling of air, reproducing a realistic sound stage where all the musical instruments are set free. This effect has been evaluated also by musicians and recording engineers, and RR-888 is used at several mixing rooms and mastering rooms. Retail price is 699 euro, now for 529 euro only. Check our other listings for more interesting items. Free shipping worldwide!