The DubHorn:Wi's TC 5100NEO loaded 20hz horn. - Page 4 - diyAudio
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Old 30th March 2010, 11:22 AM   #31
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Default jbell, you have realy confused me!



Your cartoon appears to show the horn throat becoming narrower towards the rear of the box. At the rear of the box it suddenly jumps to its widest. The horn path then becomes narrower as it approaches the mouth.

I am a complete TH newbie - I thought the horn starts smallest in teh mouth and becomes larger and larger in cross-sectional area until it reaches the mouth.

So I am really confused!
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Old 30th March 2010, 12:22 PM   #32
jbell is offline jbell  United States
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One path splits into 2 at the rear of the 'cartoon', and cross sectional area stays the same, and continues the negative flare from 4000cm2 to 2000cm2.

There is no exact rule on expansion flares for a TH, or many of it's variants.

An expanding flare gives more overall spl, and more higher freq output.
A reducing flare sacrifices spl and higher freq output, in favor of going lower.

You can have expanding and/or contracting flares, or even 'stepped sections' in a TH.

Wi wanted flat to 20hz, no matter what, and my hornresp sim gives that.
In order to get that, much spl potential above 20hz is sacrificed.
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Old 30th March 2010, 12:50 PM   #33
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Default jbell - thanks for explaining!

looks like I have a long road ahead of me. So much to learn!

I'm looking forward to more vicarious thrills as Wi's project takes off.

It's like a rocket launch. I don't want to be near it, but it's pretty cool watching at a distance!

To avoid beginners like me pestering the people in the know with questions, is there a tapped horn theory page you would recommend above all others? Ideally with examples and pictures... I have seen a few, but it's hard to sort the wheat from the chaff.

thanks!

Ben

P.S. "An expanding flare gives more overall spl, and more higher freq output.
A reducing flare sacrifices spl and higher freq output, in favor of going lower."

And a tapped horn with no flare would be a (tuned and tapped) pipe?
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Old 30th March 2010, 04:31 PM   #34
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TRIO8 "Unhorn" Proof Of Concept - Home Theater Forum and Systems - HomeTheaterShack.com
Simple Tapped Horn Tutorial using Hornresp - AVS Forum
19.5Hz Tapped Horn(Not a Phase Box!) - Realm of Excursion
Collaborative Tapped horn project
Click the image to open in full size.

Last edited by BP1Fanatic; 30th March 2010 at 04:36 PM.
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Old 1st April 2010, 12:56 AM   #35
bjorno is offline bjorno  Sweden
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Hi,

FYI and 2 cents of thoughts: While we all are waiting for a HR input screen data or similar trustworthy information of the suggested design:
Look at my simulations that I believe should work in order trying to comply with the requirement of 20 Hz horn loading..

b
Attached Images
File Type: jpg 1-TC-Pro5100-horn-20Hz_140dB_requirement.JPG (404.8 KB, 610 views)
File Type: gif 2-TC-Pro-5100_TH.GIF (145.8 KB, 587 views)
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Old 1st April 2010, 04:00 AM   #36
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Wi wants the box under 509L or under 36" x 36" x 24". I kept coming up with 1KL boxes too.
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Old 1st April 2010, 04:09 AM   #37
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Quote:
Originally Posted by BP1Fanatic View Post
Wi wants the box under 509L or under 36" x 36" x 24". I kept coming up with 1KL boxes too.
No way to get it that small, looking like 21 or 22 cu ft minimum.
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Old 1st April 2010, 04:57 AM   #38
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I was getting 130dB @ 20hz around 610-630L with a 1 sub TH @ 0.5Pi in Hornresp.

Last edited by BP1Fanatic; 1st April 2010 at 05:00 AM.
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Old 1st April 2010, 05:03 AM   #39
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Most likely, the scenario for use is this:

50% of the time: 1 sub, House party

15% of the time: 2 subs, small club

35% of the time: 4 subs, medium to large club.


Unless 4 of them is just so sick I'll need to take them to everything, maybe 2 to house parties.
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Old 1st April 2010, 05:09 AM   #40
jwmbro is offline jwmbro  United States
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What I like about this forums is there are so many people with so many different tastes. You've got the classical music purists, the middle aged guys who only listen to classic rock, cause that's what they liked as kids, and the partying youngsters listening to dubstep. Me personally I like all three (great to see C&S mentioned in here, my fav dubstep track at the moment is Mad House by C&S, with rap by MURS).

Anyways, don't really have any design suggestions to add, but I'll be following this thread, as I'm quite curious to see what comes from this. 140dB at 20Hz is a pretty ambitious target, especially when it's not a one-note car-tuned boombox. So I hope you can figure something interesting out, seems to be a lot of nice developments lately with horns and quarterwaves and tapped and folded whatnots, nice to see all the variety.
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