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Re: There are other problems here

Posted by Mark Seaton (M) on January 25, 2006 at 08:30:18

In Reply to: There are other problems here posted by EGeddes on January 25, 2006 at 07:04:55:

"I have always been concerned with the Unity approach because it seems to discount the fact that the sound from the drivers closer to the mouth also goes back down the horn body and reflects off of the other drivers thereby creating a secondary sound source which is significantly delayed from the first - usually a bad thing. The extent to which this is a problem is unknow to me since I have no data, but at first look it appeared that this could be an achiles heal to the design.

Perhaps Tom has some data that he can share showing the unEQ'd frequency response of a unity horn on axis. Seperatly for each set of drivers would be most enlightening."

Hi Earl,

I'm not sure if you have seen Tom's more recent designs like the TD-1 or his new SH-50 with Danley Sound Labs, but the problems you described are a concern, and dealt with. The simple answer is that below some low frequency, the throat is close enough to not allow a reflection, but rather just additional air volume in the horn. Indeed, at roughly 1/4 W-L to the throat, there will be a notch in the response. The small entry holes and remaining air space in front of the cone makes for a bandpass that can be made to greatly attenuates output where reflections would occur.

This does generally place a bit more demand on the LF output of each section, but the ability to employ larger horn (relative to the higher frequency components) in a given box size helps counteract this a bit.

The design is hardly without intricacies and interactions to be dealt with, but having measured many of them, I suspect the problems you are much less significant than you may suspect. The intrusion of the midrange entry holes are probably the only identifiable issue, depending on how the design was optimized.

Best Regards,

Mark Seaton

PS - only recently did I realize that we had met at Tom Danley's BBQ many years back when I was younger and dumber. I was part of the caravan that made the trip up from Purdue.

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