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Multi-Way Conventional loudspeakers with crossovers

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Old 11th December 2010, 02:20 PM   #11
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Here is part one of the localisation experiments :
http://www.essex.ac.uk/csee/research...3D%20audio.pdf
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Old 11th December 2010, 02:21 PM   #12
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Here is the paper about speaker placement :
http://www.essex.ac.uk/csee/research...0placement.pdf
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Old 11th December 2010, 02:25 PM   #13
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Old 11th December 2010, 02:30 PM   #14
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I would have expected a much rougher response given the reflective surfaces nearby (like the bucket). Very surprising.
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Old 11th December 2010, 02:37 PM   #15
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Here is the Virgo review :
Audio Physic Virgo loudspeaker | Stereophile.com
Thanks, 6.283
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Old 11th December 2010, 02:46 PM   #16
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Sy, i was surpised too but it may be responsible for the "hole" i experience under 2.5kHz.
The wavelength there is around 20cm so the sound travels to the bucket and comes back partly out of phase. Higher frequencies are not affected as much i think. I may put the tweeter in a nylon ball i have and may or may not damp it on the back to avoid the "roundabout problem" ( that was really new information for me ).
The midrange will be eventually put in a wooden ball so the ZDL will look different then the Stoll speakers.
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Old 11th December 2010, 04:04 PM   #17
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Before you find that out clever guys here, Dominics work was preceeded at least 30 years.
See a ZDL by Elipson from the 50th.
Most of you will know Olsons work on diffraction from the 40th i asume.
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Old 11th December 2010, 04:50 PM   #18
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Quote:
Originally Posted by Joachim Gerhard View Post
Sy, i was surpised too but it may be responsible for the "hole" i experience under 2.5kHz.
Do you still have the impulse response?

I remember spending an afternoon at Precedent Audio back in the '70s, carving out driver holes in styrofoam balls to mount some SEN-labs domes. It wasn't a new concept even then. Like any other tool on the illusion end of things, the question is always, does the implementation address the design goal and if so, how well?

I don't get the "purity" argument here at all. This isn't electronics, it's loudspeakers. Appreciate you opening this thread and sharing data.
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Old 11th December 2010, 07:10 PM   #19
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Hi SY ! No, i did not store the impulse response. I measure with a sine sweep and derive the transfer function from that. The transfer finction can of cause be post processed into the impuls response. If you want to know about early reflexions i whould like to present you the Cepstrum. I will do that later. Thanks for your time.
So you played with balls too ?
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Old 11th December 2010, 07:49 PM   #20
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Quote:
Originally Posted by Joachim Gerhard View Post
So you played with balls too ?
Ahem, perhaps we can rephrase that.


Yes, the results were interesting, but Precedent folded before we could really work out the details. It was a remarkable company- transmission line midranges, Sonotube cabinets, modular three ways, Dynaudio drivers, all pretty exotic in 1976. They also sold a zero loop feedback tube-FET hybrid preamp with a switching supply.
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