Mike Silverton has posted a review of the Acoustic Revive’s RR-888 Schumann Resonace Generator ($685) at Stereo Times. His conclusions:
“At $685 USD, the RR-888 is something very like a must-have addition. Again, I started with the provided wall wart and liked what I heard. It might just be enough for you. However, substituting a linear power supply impresses me as an improvement, tho certainly not of the I-can-hear-the-difference-in-the-shower variety.”
You can read the full review here.
