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Re: Ok, but...

Hi Dave,

We expect to show the Summas at the Rocky Mountain Audio Fest. We don't plan to have a turntable in the room, so bring your favorite "ones and zeroes" and bring your ears.

If I might add a few comments to what Earl wrote...

Blind listening tests played a huge but indirect role in the development of the Summas. Earl and his audiologist wife Lidia have conducted extensive research in the field of psychoacoustics, and have a great deal of information of "what really matters and what doesn't" (get a taste at the link below). Some of their findings appear in print (see the list of publications on Earl's resume' page), but much of it does not.

On the other hand, Earl has found that non-blind evaluations are not reliable enough to use as the basis for a change. That's not to say they're worthless, but that a change would only be made after measuring and computer modelling (Earl often writing the program as he goes along), and any change would be consistent with acoustic and psychoacoustic principles established in controlled blind studies.

For example, non-blind listening indicated that the speakers sound different if a tube amp is used instead of a solid state amp. Measurements confirm a difference in the frequency response curve related to the amp's output impedance. Earl modified a computer program to model these effects, and we'll be able to offer the speakers with the crossover optimized either for a high output impedance (tube) amp or a low output impedance (solid state) amp.

Feel free to shoot me an e-mail, maybe with your phone number, and I can talk a bit more freely than would be appropriate here.

Duke



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