Spatial Audio Black Hole Anti Wave Generator [[[PRICE REDUCED]]]

Clayton Shaw of Spatial Computer: "Our Black Hole is an active acoustic pressure reduction device. It was designed to improve sound quality in domestic environments as the only known means of dealing with room-induced anomalies in a compact form factor. An active acoustic pressure absorber was first mentioned by HF Olsen in his 1957 book Acoustical Engineering, a reference text still in common use today. In 1990 Nelson Pass was awarded the active low-frequency acoustic resonance absorber US patent 4899387 in which he outlined a clever embodiment of the concept along with application and performance criteria. He released a production design as the Phantom Acoustics Shadow. Robert Harley reviewed it for Stereophile and found it highly effective. The Shadow was only produced for a few years. We have taken up the mantle with the Black Hole. Our focus was to simplify and improve where possible and reduce size and price. We view this approach as an integral part of a total room solution that may also include passive treatment and equalization to optimize the listening experience. The Black Hole is even more useful when a given installation makes passive bass traps impractical. Its compact 15" cubed dimensions allow most listeners to integrate it into their room plan. The Black Hole employs a heavy-duty 12" driver and a 350-watt power amp to provide enough output to civilize a typical listening room of 15' x 25' or smaller. Larger rooms may require two units. The main requirement is that the unit be located against a wall boundary where acoustic pressure builds up. Along a wall or in a corner behind the listening seat is recommended but some experimentation tends to be required for the best results in the listening position. A/B comparisons are easy since the device can be turned on/off during the listening session."

6moons has a review. google "spatial computer black hole".