High Efficiency Speaker Asylum: We disagree on a couple of points by EGeddes Need speakers that can rock with just one watt? You found da place.

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Posted by EGeddes (P ) on February 19, 2006 at 16:49:34

In Reply to: Re: LF horns posted by tomservo on February 19, 2006 at 15:59:56:

"Horns can also be made to have very low harmonic distortion for a given SPL, compared to a direct radiator too. Since most of the driver’s non linearity is motion related, using horn loading to reduce the radiator motion to a fraction for a given SPL helps here."

First THD is a meaningless metric of perception (see Geddes and Lee, Oct. 2003 AES). The type of distortion that is most audible will actually be accentuated by the horn, not minimized by it. The current (I) nonlinearity, which is probably the most audible, is not really affected by the horn, perhaps a small amount. But then there is the recent study (Geddes and Lee, Dec 2005 JAES) on the audiblity of nonlinear distortion in compression drivers - it was inaudible at all drive levels up to the thermal limit of the highest power drivers available.

So I'd have to say that there is no data to support that a horn actually has less audible distortion than a direct radiator. And I suspect that if a test were done in this regard it would show that there is no advantage to a horn. Maybe you could do such a study?

"Done properly and if large enough, LF Horns can eat up an equal sized Vented box array with a lot less power and less distortion."

This was not at all what Don Keele found in his study of horns versus direct radiators (JAES, 1980's some time) and I think that you should read that study. His conclusions were quite the contrary of what you claim. This article was posted here some months back when this same subject came up. Perhaps that poster will post it again.

Sorry Tom but we'll have to agree to disagree on this one too. But thanks for the post.

Earl Geddes

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