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Old 2nd February 2014, 12:18 AM   #1
Defo is offline Defo  Norway
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Default 2-way horn system - need some input

Hello!

I would like some input on this system idea. More specifically, center-to-center spacing, system integration/crossover issues. Will these issues be a problem with the system idea in question?

- 75 cm center-to-center spacing
- 500hz 48 db/octave digital crossover (miniDSP)
- 2" 400hz spherical wooden horn (Faital Pro HF204 driver)
- 10" B&C 10HPL64 (closed enclosure/linkwitz transform)

Cheers!
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Old 2nd February 2014, 12:21 PM   #2
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48 db/octave digital crossover @500Hz, 75 cm apart? Wouldn't you have problems with location (of the source) first, at crossover frequency?!
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Old 2nd February 2014, 01:19 PM   #3
fpitas is offline fpitas  United States
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The polar pattern of that arrangement near the crossover point will be...interesting.

Then, those horns will start beaming the highs around 4kHz. I guess if you sit far enough away...
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Last edited by fpitas; 2nd February 2014 at 01:23 PM.
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Old 2nd February 2014, 01:33 PM   #4
Defo is offline Defo  Norway
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Quote:
Originally Posted by Inductor View Post
48 db/octave digital crossover @500Hz, 75 cm apart? Wouldn't you have problems with location (of the source) first, at crossover frequency?!
Isn't this minimalized with such a high crossover slope, and low crossover point?
The maximum crossover frequency with 75 cm spacing should be about 450 hz, by following the center-to-center spacing rule of thumb (speed of sound/c-c spacing in inches).

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Originally Posted by fpitas View Post
The polar pattern of that arrangement near the crossover point will be...interesting.
Do polar patterns at crossover point, still matter as much at such a low crossover point?
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Old 2nd February 2014, 01:36 PM   #5
fpitas is offline fpitas  United States
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Quote:
Originally Posted by Defo View Post
Isn't this minimalized with such a high crossover slope, and low crossover point?
The maximum crossover frequency with 75 cm spacing should be about 450 hz, by following the center-to-center spacing rule of thumb (speed of sound/c-c spacing in inches).



Do polar patterns at crossover point, still matter as much at such a low crossover point?
I don't know why not. Your ears can certainly locate a 500Hz source. As for the 48dB/oct slope, I've never had success with 8th order LR: the best I can say is that it sounded disturbing.
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Old 2nd February 2014, 01:37 PM   #6
adason is offline adason  United States
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for so high a crossover frequency, 500Hz, you need to place those woofers as close to the horns, ideally right under...
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Old 2nd February 2014, 01:56 PM   #7
fpitas is offline fpitas  United States
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Here, try this out:

Tolvan Data

and as adason said, place the woofers under (or if you just have to, over) the horns. That way the polar pattern at crossover will narrow in the vertical plane, which is typically less noticeable.
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Old 2nd February 2014, 02:05 PM   #8
fpitas is offline fpitas  United States
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And, I meant it about those horns beaming. You can toe them in to point at a particular "sweet spot" if you listen alone, but otherwise you may want to add proper tweeters. Also, the 2" exit horn drivers won't sound their best over about 6kHz; the diaphragms will start to break up into rather bad sounding modes.
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Old 2nd February 2014, 02:56 PM   #9
adason is offline adason  United States
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maybe this helps:
Hi-End and Hi-Eff loudspeakers system
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Old 2nd February 2014, 03:08 PM   #10
Defo is offline Defo  Norway
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Thanks for the inputs everyone!

My hope was that I could use one single woofer section for both horns, as it would raise WAF quite a bit compared to my current system. But I see that I will face location and CTC spacing issues, as well as beaming issues, so I reckon it won't be a good idea.

fpitas:
The Faital Pro HF204 does'nt seem to have much breakup issues with its Ketone Polymer diagphram, compared to traditional metal diagphram drivers.
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