Shiva Tapped Horn - Page 5 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #41 of 166 Old 01-29-10, 07:11 PM
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publius
 
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Re: Shiva Tapped Horn

i understand that this is goofy, but stick with me...good content coming...i just need to get to my fifth post to post it.
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post #42 of 166 Old 01-29-10, 07:15 PM
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Re: Shiva Tapped Horn

here is a non-tapped horn that i worked up in hornresp for the updated shiva.

it is 10 cubic feet and improves the efficiency of the shiva by about 10db, which is huge. i'm not interested in the contest or getting free drivers, just wanted to kick in a design. [oh, i also post on avs under callsign LTD02]

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Shiva Tapped Horn-shiva_horn_project.png  

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post #43 of 166 Old 01-29-10, 07:27 PM
Kevin
 
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Re: Shiva Tapped Horn

Quote:
publius wrote: View Post
here is a non-tapped horn that i worked up in hornresp for the updated shiva.

it is 10 cubic feet and improves the efficiency of the shiva by about 10db, which is huge. i'm not interested in the contest or getting free drivers, just wanted to kick in a design. [oh, i also post on avs under callsign LTD02]


Yea... throw an inductor on that and it starts to look good. A lot of people get freaked out by the out of bandwidth wiggle but we are focusing on the <70-80Hz stuff and the upper frequency climb is easy to deal with.

Kevin Haskins
Exodus Audio
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post #44 of 166 Old 01-29-10, 07:29 PM
Kevin
 
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Re: Shiva Tapped Horn

Quote:
publius wrote: View Post
here is a non-tapped horn that i worked up in hornresp for the updated shiva.

it is 10 cubic feet and improves the efficiency of the shiva by about 10db, which is huge. i'm not interested in the contest or getting free drivers, just wanted to kick in a design. [oh, i also post on avs under callsign LTD02]


Yea... throw an inductor on that and it starts to look good. A lot of people get freaked out by the out of bandwidth wiggle but we are focusing on the <70-80Hz stuff and the upper frequency climb is easy to deal with. In room with proper boundary loading you get response lower but it would have to be built and measured.

Kevin Haskins
Exodus Audio
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post #45 of 166 Old 01-29-10, 07:37 PM
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Re: Shiva Tapped Horn

i think it looks fantastic as it is kevin. those bumps and wiggles seem to go away when the horn placed in a room and measured, but most folks probably don't know that. if you put a regression line through the frequency response, there is only +/-2db of 'wiggle' in the model from 15-80hz. that is much less than many other designs, even the danley dts-10, and will be dwarfed by room effects. i was very surprised at how well the shiva could do in a 10 cubic foot horn, which is relatively small.

hopefully, others will beat my design. come on guys...bring it on. :-)
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post #46 of 166 Old 01-29-10, 07:43 PM
Kevin
 
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Re: Shiva Tapped Horn

Quote:
publius wrote: View Post
i think it looks fantastic as it is kevin. those bumps and wiggles seem to go away when the horn placed in a room and measured, but most folks probably don't know that. if you put a regression line through the frequency response, there is only +/-2db of 'wiggle' in the model from 15-80hz. that is much less than many other designs, even the danley dts-10, and will be dwarfed by room effects. i was very surprised at how well the shiva could do in a 10 cubic foot horn, which is relatively small.

hopefully, others will beat my design. come on guys...bring it on. :-)
Yea... it looks great. I'm just talking about the 10dB climb from 20Hz to 100Hz. That is trivial to work with but not what many people are used to looking at when modeling traditional boxes. I bet an in-room measurement would get down to the 10-12Hz range.

That is a ton of output... give us the napkin drawing next. ;-)

Kevin Haskins
Exodus Audio
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post #47 of 166 Old 01-29-10, 08:29 PM
DerekG
 
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Re: Shiva Tapped Horn

This is set up for a tempest-x but could be narrowed a little to fit a shiva. I'm designing it as a option to an IB install. It will live behind our couch and fire directly into a corner. Hopefully it has a shot at .5 or 1 pi space.

I'm still toying with the specs on s1/2 being smaller thanks to some info from lilmike over at avs to help smooth out the response.

Here are the parameters, response and a napkin drawing

Shiva Tapped Horn-horn-response.jpg

Shiva Tapped Horn-horn-info.jpg

Shiva Tapped Horn-tempest-horn.jpg
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post #48 of 166 Old 01-29-10, 09:34 PM
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Fred
 
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Re: Shiva Tapped Horn

Quote:
publius wrote: View Post
i think it looks fantastic as it is kevin.
I agree. Your model looks a titch better than anything I can come up with. The learning curve on hornresp is a little steep.

Kevin. What exactly does an inductor do here?

Also, what sort of compression ratio do you think we can safely subject this driver to?
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post #49 of 166 Old 01-29-10, 09:50 PM Thread Starter
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Re: Shiva Tapped Horn

Quote:
dgilme wrote: View Post
This is set up for a tempest-x but could be narrowed a little to fit a shiva.
Hate to point this out, but it's not a TH.
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post #50 of 166 Old 01-29-10, 10:51 PM
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Re: Shiva Tapped Horn

"Your model looks a titch better than anything I can come up with."

hi fredk, that just seems to be the nature of modelling in hornresp. sometimes, i have farted around for an hour or more and then someone else jumps in with a model that is vastly superior with 2 minutes work. at this point, it seems that there is a little bit of luck at work in arriving at an optimal horn design for a driver. hopefully, somebody will be luckier than either of us and propose a whopper of a horn design for the shiva driver.
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