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The IMP Arrives
All right, I am going to attempt to burst the dam of silence on RAHE by
telling about the new speakers that I have designed and had built by the capable hands of Dan Neubecker in Indiana. He didn't debut it in the InDIYana event because the venue was not suitable for this type of speaker. Brieflly, this is the embodiment of all of my Image Model Theory tenets on how a speaker should be designed. I said that what we hear in a speaker is its image model, which is the radiation pattern as reflected by the surfaces nearby in a pattern of actual and virtual speakers, or sources. I want my image model to look like a lattice of evenly spaced sources like this: https://s3.amazonaws.com/masters.gal...81994e4099169d To achieve this image model, the speaker needed to have more output in the reflected direction, and a certain "shaped" frontal radiation, so we put two gain pots on the two front panels to be able to reduce the frontal output and at the same time do the distance/intensity trading effect called for by Mark Davis in the Soundfield One speaker. We have settled on a -9 dB for the outer front panels and - 3 dB for the inner panels. The speakers thus had to have drivers on four sides of a square cross section box with MTM drivers on each face, something like this: https://s3.amazonaws.com/masters.gal...8ab783642bb6ef and the final design looks like this: https://s3.amazonaws.com/masters.gal...98e22052d64852 which, in my room, looks like: https://s3.amazonaws.com/masters.gal...1be93b6797f2cc I hope all of these images come through OK. The room is 21 x 31 ft, the speakers positioned 5 ft out from the front wall, 5 ft in from the side walls, for an image model that has all real and virtual sources spaced evenly 10 ft apart. The sound is as spacious as it gets, has very sharp imaging, speakers disappearing entirely and casting a sound field behind, between, and to the sides beyond the separation of the speakers in a way that makes it seem like the musicians are right there with you. This is a sat/sub system with the IMPs doing the satellite part and a Velodyne F-1800 doing the subwoofer chores. It is balanced, full range, spacious, and precise. I have yet to test them against other high end speakers, but I don't know what else a speaker can do better in any of the audible areas of speaker performance. Frequency response, radiation pattern, and room positioning, that's all there is, there is no more. Questions? Comments? Gary Eickmeier |
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