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In the Forum: Audio Discussions
In the Thread: Hørning prøblems.
Post Subject: Re: Horning further questions.Posted by Thorsten on: 5/23/2005

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Roman,

 Romy the Cat wrote:
Regarding the absents of the band-pass filters… Perhaps you are correct.
 I am correct, I have been inside Hoerning speakers, to find "what makes them tick"....
 Romy the Cat wrote:
However, they use Lowther DXII that runs up to 6-7kHz. Probably they let the Lowther decay I upper knew naturally, which is fine.
 Yup, that is what Tommy Hoerning does.
 Romy the Cat wrote:
The lower knee in their Lowther quite low and they truncated it at 200Hz. it is what I remember they told at the manufacturer web site.
 Not quite. The woofer(s) come in at 200Hz, the low Qt of the Lowther makes the SPL roll off notably below around 200Hz, the TQWT has nowhere near enough LF gain to compensate that.
 Romy the Cat wrote:
I was quite surprised when I read it, as 200Hz is too high for those 12" Beyma to handle.
 You think so? I find reproducing 1KHz with a decent 12" Driver no problem.
 Romy the Cat wrote:
BTW, an “equalization circuit to flatten ze upper midrange bump” destroys sounds order of magnetite heavier then a 6dB filter.
 
It may or may not do. I was not commenting on the sense or lackthereoff od the design, I merely discussed what is actually done.
 Romy the Cat wrote:
OK, it makes sense. Interestingly I never seen the Hoerning principle explanation as TQWT loaded with two drivers according to Horns and Voight Pipes concepts. How, difficult for that rep at the show would be juts to mention it?

The only reason I can explain it like that is that I have disassembled Hoerning speakers and in the process (as I do routinely) documented the design (I have done this for many speakers that have passed through my hands). BTW, I do not do any of my reverse engineering in order to copy things, but to understand how they work....
 Romy the Cat wrote:
Hm, a non-truncated Lowther in TQWT application should go all the way down to ~50-60Hz,
 Nope, there is NO WAY in the world you can even approach a flat energy balance with a single Lowther in TQWT, there will invariably a tipped up balance. Add to that the combfilter effect of the line and you have a mess. If you use two drivers in two TQWT's suitably tuned the "comb's" of the comb filtering interlock and give a reasonably even LF output.

Again, I do not claim this to be the greatest solution or not, I merely state how it works in the observed example.

Ciao T

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