Shiva Tapped Horn - Page 8 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #71 of 166 Old 01-30-10, 02:01 PM
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Mike
 
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Re: Shiva Tapped Horn

Quote:
Kevin Haskins wrote: View Post
As I said, it doesn't matter if it is tapped or not. Only the results matter. In terms of the compression ratio the answer is "I don't know". I didn't design it around a horn and it wasn't part of the design constraint. I don't think you are going to see a huge difference among drivers of the same size/format though in terms of what is acceptable for that compression ratio. I'd need to build the horn and destructively test a couple to see where the limits are.

You are only going to see those ratios under full bore/stroke so lets not get excited about 4:1 at this point.

Kevin Haskins
Exodus Audio
Wow - 4:1?!? Destructive testing?!? When can I start!
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post #72 of 166 Old 01-30-10, 02:03 PM
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Mike
 
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Re: Shiva Tapped Horn

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publius wrote: View Post
"give us the napkin drawing next. ;-)"

kevin, here is a napkin drawing. again, not a tapped horn, but a formidable one.

i haven't worked out all the measurements/angles/etc., but something like this should replicate the sim more or less.

question: what compression ratio is the max for the shiva driver?

That is also a fold pattern I considered for the tapped horn - just remove the back of the rear chamber.
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post #73 of 166 Old 01-30-10, 02:31 PM
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publius
 
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Re: Shiva Tapped Horn

"As I said, it doesn't matter if it is tapped or not. Only the results matter."

oh...cool. i must have missed that part. i was feeling bad because i thought i might be spamming your thread with unrelated content.

well, in any case, my design is open source; i'd like to see some folks best it.
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post #74 of 166 Old 01-30-10, 02:32 PM
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publius
 
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Re: Shiva Tapped Horn

i feel like i am operating in parallel universes here. should i copy all my avs posts on this topic here or is everybody also following along over at avs?
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post #75 of 166 Old 01-30-10, 03:34 PM
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John
 
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Re: Shiva Tapped Horn

Kevin,

Do the external dimensions have to be under 10 cu ft? That's only 283 liters...gonna be kinda tough to get a 15Hz horn in that...I can mess w/ the 20Hz horn some, though...

JSS
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post #76 of 166 Old 01-30-10, 03:36 PM
Kevin
 
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Re: Shiva Tapped Horn

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maxmercy wrote: View Post
Kevin,

Do the external dimensions have to be under 10 cu ft? That's only 283 liters...gonna be kinda tough to get a 15Hz horn in that...I can mess w/ the 20Hz horn some, though...

JSS
No... the size is not fixed. Play around with it and submit your favorite. You could even do a tall one designed to fit in the corner.

Kevin Haskins
Exodus Audio
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post #77 of 166 Old 01-30-10, 05:14 PM
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John
 
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Re: Shiva Tapped Horn

For a front loaded 15Hz horn, I need around 600L to get good output (over 90dB 2.83V, 2pi). The 20Hz horn gets the same output (but less extension) with 1/2 the size....

Or you could do a PA style horn (30Hz tune), same size as 20Hz horn (approx 260L), but with 120+dB on tap at Xmax at 30Hz, 2Pi space...the 20Hz horn is Xmax limited to 112dB at 20Hz in 2pi space, and the 15Hz horn at just over 110dB at 15Hz.....pick where you want to get off the train....

Choices, choices....

Which would you rather I work up (if any)?


JSS
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post #78 of 166 Old 01-30-10, 06:08 PM
Kevin
 
Join Date: Nov 2007
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Re: Shiva Tapped Horn

Quote:
maxmercy wrote: View Post
For a front loaded 15Hz horn, I need around 600L to get good output (over 90dB 2.83V, 2pi). The 20Hz horn gets the same output (but less extension) with 1/2 the size....

Or you could do a PA style horn (30Hz tune), same size as 20Hz horn (approx 260L), but with 120+dB on tap at Xmax at 30Hz, 2Pi space...the 20Hz horn is Xmax limited to 112dB at 20Hz in 2pi space, and the 15Hz horn at just over 110dB at 15Hz.....pick where you want to get off the train....

Choices, choices....

Which would you rather I work up (if any)?


JSS
For a front loaded horn I think 20Hz cut-off is reasonable. The box size is certainly much more in the range of what I'd like to see.


We are going to have to do some Anarchy horns next.

Kevin Haskins
Exodus Audio
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post #79 of 166 Old 01-30-10, 07:01 PM
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Ryan
 
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Re: Shiva Tapped Horn

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littlemike wrote: View Post
Here I am helping my competition.....
thats y i love this arena!
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post #80 of 166 Old 01-30-10, 08:28 PM
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John
 
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Re: Shiva Tapped Horn

I'll work up the 20Hz front loaded horn, and make it the subject of the folding tutorial I promised everyone at AVS. Should be complete tomorrow. I'm gonna draw up 1/2" ply (12mm) for panels and reflectors, and 1/4" ply for bracing.

Quick fold tells me that this one will be around 12.5 cu ft. first folding gave me 33"x33"x20". To get under 10 cuft, you need to start with a 225-230L model...with 1/2" building material.

JSS

Last edited by maxmercy; 01-30-10 at 09:07 PM.
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