Beyma 18P80Nd in sub horn: Am I missing something? - Page 3 - diyAudio
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Old 9th June 2013, 02:54 PM   #21
epa is offline epa  Netherlands
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updated the pic with measurements.
best is to buy a 5'x10'(153x305) sheet
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Last edited by epa; 9th June 2013 at 02:58 PM.
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Old 9th June 2013, 04:02 PM   #22
epa is offline epa  Netherlands
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ok ive modified it a bit ,see pic
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Old 9th June 2013, 09:45 PM   #23
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Wow Eric, that's fast! Thanks. Ga daar eens voor naar een ontwerpbureau .

I have a sheet of 153x153 BB and some leftovers from previous projects. I intend to brace the hell out of it, but use 12mm panels to keep it as light as possible.

I see you've flattened the output very nicely. Is that because of the higher Le (3,80 instead of 1,90)?
Click the image to open in full size.
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Old 9th June 2013, 10:16 PM   #24
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Just to be correct, isn't S5 (151,4-13,01-72,55)X50 = 3292, instead of 4000?

It doesn't alter the response much, so it's not that important.
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Old 10th June 2013, 05:28 AM   #25
epa is offline epa  Netherlands
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ive took the averige of the red marked piece

le rizes as frequentie drops so doubling it wil give a more realistic picture.
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one good thing about music ,when it hit you feel no pain.
so hit me with music
. hr driver db

Last edited by epa; 10th June 2013 at 05:32 AM.
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Old 10th June 2013, 10:29 AM   #26
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So a larger horn mouth = larger S5 = shorter horn path? For example, a 10cm decrease of of the 72-cm panel is simmed with HR by the following:
- enlarging S5 by 10x50=500,
- lengthening the second Con (L45) from 27 to 37,
- shortening the first Con (L34) from 185 to 175.

Correct?

Ah, didn't know that about Le. I already wondered why Le is spec'd at 1 kHz...
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Old 10th June 2013, 02:42 PM   #27
epa is offline epa  Netherlands
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almost correct .
in this case the driver is perpendicular on the hornpath. so L4-5 stays aprox 27
L3-4 is shortened by 10 cm

you could make the front closed ,and cut out the mouth,leaving 3cm over on the sides to stiffen top and bottem pannel.
Click the image to open in full size.
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. hr driver db
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Old 10th June 2013, 05:43 PM   #28
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L45 doesn't change. I knew that. Ok, 2nd try:

A larger horn mouth = larger S5 = shorter horn path? For example, a 10cm decrease of the 72-cm panel is simmed with HR by the following:
- enlarging S5 by 10x50=500,
- shortening the first Con (L34) from 185 to 175.

Regarding the front, I was actually thinking in the opposite direction: make the front detachable/adjustable. That way I could use the horn for pack space, for example shoehorn in a pair of synergy horns .
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Old 10th June 2013, 08:48 PM   #29
epa is offline epa  Netherlands
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Quote:
Originally Posted by Thijs666 View Post
L45 doesn't change. I knew that. Ok, 2nd try:

A larger horn mouth = larger S5 = shorter horn path? For example, a 10cm decrease of the 72-cm panel is simmed with HR by the following:
- enlarging S5 by 10x50=500,
- shortening the first Con (L34) from 185 to 175..
you got it, in case of S5 being 4000 lenght is 185,and if S5 is 3300 lengt is ~197,S5=4500 lenght is 175(in reality acoustic path could differ a bit,compared to the sim)
looking forward to see your bild.
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one good thing about music ,when it hit you feel no pain.
so hit me with music
. hr driver db

Last edited by epa; 10th June 2013 at 08:55 PM.
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Old 11th June 2013, 10:06 AM   #30
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Thanks Eric! I'll take some pictures . I can hardly wait to start building .
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