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Horn coupling
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Dr Burnz View Drop Down
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Points: 100 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dr Burnz Quote  Post ReplyReply Direct Link To This Post Posted: 06 November 2007 at 1:57pm
So far, this is what I envisage:

Does this look about right?Ermm The coupling causes the sound waves to merge, and as they are traveling in the same direction, they join together as each wave exits the horn. Causing them to continue traveling in a path as if there was a longer horn wall (virtual horn path)? slightly increasing efficiency. Approve
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johnny B View Drop Down
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Points: 91 		Post Options Post Options   Thanks (0) Thanks(0)   Quote johnny B Quote  Post ReplyReply Direct Link To This Post Posted: 24 December 2007 at 3:56pm

hi there does coupeling work with HD15 as these are sort of bandpass\horn box's is it best to stack them i 4's so that all the horns form one big horn or in a long strate line

 

thanks john

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_djk_ View Drop Down
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Points: 6002 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 25 December 2007 at 1:44am
A well thought out and well constructed  double 12 bass horn with a 25hz taper rate and 18mm Baltic Birch (EAW).
 
A single cabinet shows the dip just above Fc from the small mouth. The 2x2 array shows, what, maybe 1.5dB improvement at 30hz, and maybe 3dB at 60hz. It almost makes its theoretical 6dB at 200hz. These are normalized for 1W, in actual use each 4R box would be on its own amp channel so the 2x2 curve would be 6dB higher (and 4W total going in).
 
We are NOT going to get the 6dB of increase in efficiency that the theory predicts (because the cabinets are made of wood), and it doesn't look like a block of four go any lower than a single either.
 
Do NOT expect 2Pi response in the bass (6dB gain over 4Pi) if you're upstairs (even 4" of re-inforced concrete is transparent at low frequencies).
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tommysb View Drop Down
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Points: 1036 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post Posted: 25 December 2007 at 2:03pm
It's not a 6dB EFFICIENCY increase that's expected is it? I thought the additional 3dB was due to doubling the power handling, so it's a 6dB on 'max output'.
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darkmatter View Drop Down
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Points: 2425 		Post Options Post Options   Thanks (0) Thanks(0)   Quote darkmatter Quote  Post ReplyReply Direct Link To This Post Posted: 25 December 2007 at 3:03pm
Originally posted by tommysb tommysb wrote:

It's not a 6dB EFFICIENCY increase that's expected is it? I thought the additional 3dB was due to doubling the power handling, so it's a 6dB on 'max output'.
 
i've been having to try and decipher which people are talking about in quite a few posts in this thread!
 
newbie question: is the basic idea that the compressions and rarefactions in the air coming out of one cabinet affect the pressure seen at the mouth of the other cabinet? so when you couple horns, you are effectively changing the compression ratio, giving the efficiency increase, and surface area, giving the extended LF response?
 
Quote Do NOT expect 2Pi response in the bass (6dB gain over 4Pi) if you're upstairs (even 4" of re-inforced concrete is transparent at low frequencies).
 
which is why we love the dingy basementsEmbarrassed
 
enough of this forum reading, time for roast tatoes, merry xmas all!


Edited by darkmatter - 25 December 2007 at 3:07pm
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_djk_ View Drop Down
Old Croc
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Joined: 23 November 2004
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Points: 6002 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 25 December 2007 at 9:27pm
"It's not a 6dB EFFICIENCY increase that's expected is it?"
 
On direct radiators it is.
 
One driver 95dB (2.83V@8R)
Two drivers 98dB (2V@4R)
Four drivers 101dB (1.414V@2R)
djk
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nierix View Drop Down
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Points: 31 		Post Options Post Options   Thanks (0) Thanks(0)   Quote nierix Quote  Post ReplyReply Direct Link To This Post Posted: 26 December 2007 at 9:28pm
nice threat,
 
i have a new idea in coupling horns, PA big bass,
 
any opinions?
HiFi horn plans
by hm-moreart
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tommysb View Drop Down
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Points: 1036 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post Posted: 27 December 2007 at 12:03am
Koenen sie bitte in Englisch schrieben deine idee?
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nierix View Drop Down
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Points: 31 		Post Options Post Options   Thanks (0) Thanks(0)   Quote nierix Quote  Post ReplyReply Direct Link To This Post Posted: 27 December 2007 at 10:03pm
Hello,
 
new is the
membran movement cross setting
and the bass horn mouth distance,
 
look the Saxophon, Trombone, Posaune, (small Posaune running 2 hours)
the same trick. But home HiFi.
HiFi horn plans
by hm-moreart
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