Suggestions on theory behind Co-entrant horns?

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Hi all you theory types...

On another thread- http://www.diyaudio.com/forums/showthread.php?s=&threadid=4372

I asked for anyone with any ideas about this type of design, because it seems to offer the efficencies of both coupled drivers and horn loading.

I know the system controller for the Renkus Heinz boxes has a delay built in to compensate for the differing acoustic centres of the drivers, and they sound very good, but that is about all.

I have attached a cleaned up scan from an old trade mag to give you all an idea on the basic design.
 

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Hmm .. there seems to be no reason why you couldn't use a single HF driver instead of a pair, that would simplify calculating the acoustic centers accurately.

However, a guesstimate of the acoustic centers being equal to the front of the poleplate, would be a good starting point.

The co-entrant horn is a very interesting design, although not very suitable for hi-fi speakers.
 
pinkmouse said:
I think I need to seriously study that thread, although I know for a fact that Renkus Heinz already have a patent on multiple drivers loading a single horn, so I wonder where the novelty aspect comes in, in Tom's patent....

Tom went thru it all on a long post to the Joe List. Can't recall the detail, but he deserves his patent.

dave
 
pinkmouse said:
I think I need to seriously study that thread, although I know for a fact that Renkus Heinz already have a patent on multiple drivers loading a single horn, so I wonder where the novelty aspect comes in, in Tom's patent....

The difference between the patents is that while both (and several other patents) embodies multiple drivers loading a single horn, the Unity horn has a single horn with multiple horn mouths at differing depths according to frequency of coverage of the individual horn mouths, while the Dr. Heinz version has a combined single mouth from different drivers driving a single horn.

Correctly made the Dr. Heinz version is the superior one, IMHO.
 
AGGEMAM said:
The difference between the patents is that while both (and several other patents) embodies multiple drivers loading a single horn, the Unity horn has a single horn with multiple horn mouths at differing depths according to frequency of coverage of the individual horn mouths, while the Dr. Heinz version has a combined single mouth from different drivers driving a single horn.

Correctly made the Dr. Heinz version is the superior one

Are you sure you don't mean throats? The Unity-type horn has the drivers at each frequency of driver load into the horn at a different place optimum for the frequency they cover. Further, the XO + this separation ensures perfect phase matching.

I haven't heard or seen either, but the Unity-style horns get pretty high marks from those that have.

dave
 
Tom went thru it all on a long post to the Joe List. Can't recall the detail, but he deserves his patent.

Gosh, that list is deep...

Well, I think Tom deserves his patent, but I'm not sure if I'm any more knowledgable or not!

So, In the Renkus Heinz design, I assume the common drivers, (hi-hi and mid- mid) are actually loading separate horns, but just with the hi horn located in the middle of the mid horn, and the shape of the mid horn has no effect on the dispersion or loading of the hi-frequencies.

But how does the mid horn, which starts as two separate paths, cope with the sharp disconuity as it steps around the hi horn mouth, or is it a case that the two mid horns ( one from each driver) then load the front horn when they combine?

Help!!
 
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