This is where science meets art. If you happen to chance upon any Acoustic Revive demo rooms at audio shows, make it a point to step in and experience it. The former owner of this unit love it so much that he upgraded to the newer RR-888. So this is now available at a bargain price to someone who wants to try it out in their room. See the review on 6moons audio for a very accurate writeup on the RR-77. External power supply is rated for 100-240V so this can be used anywhere in the World. Just make sure the RR-77 is plugged into its own wall outlet.
Cosmetically, the casing has some marks/scratches from use but looks presentable. Unit will be securely packed for safe shipping.