Collaborative Tapped horn project - Page 18 - diyAudio
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Old 29th March 2007, 11:02 PM   #171
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Zobsky,

I am working on a folded version of the TH that I built, will be about 42" x 30" x 18". It is based on the Jensen Transflex folded scheme.

Hope to have it working by this weekend,stay tuned for further details...
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Old 29th March 2007, 11:09 PM   #172
freddi is offline freddi  United States
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hey Don - thats a nice size. can U whup out a new K that's ok? Freddy
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Old 29th March 2007, 11:28 PM   #173
zobsky is offline zobsky  India
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Quote:
Originally posted by Don Bunce
Zobsky,

I am working on a folded version of the TH that I built, will be about 42" x 30" x 18". It is based on the Jensen Transflex folded scheme.

Hope to have it working by this weekend,stay tuned for further details...
Good to hear. Should be interesting to see if the extra folding affects performance.
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Old 30th March 2007, 04:30 AM   #174
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Here is a photo of the second TH,14"wide,so it will fit between wall studs or floor joists.Will have to wait for the glue to dry before I can close it up,and see how it does...

Then on to the folded version...

http://img245.imageshack.us/img245/8...orn0049bn7.jpg
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Old 30th March 2007, 04:35 AM   #175
freddi is offline freddi  United States
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looks great - so that one is 14" wide seen at the mouth (?), 90 inches tall - how deep front to back? do you expect any measureable differences?

close the back, put mouth on other side and you'd have a tall K-like thing
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Old 31st March 2007, 03:41 PM   #176
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A 90" tall Karlson....Kool!!!

I finished the horn last night,haven't had time to do extensive evaluation,but seems to sound pretty much like the original.

external dimensions 14"x18"x90"

Only 3 dimensions were changed,the internal baffle width from 14" to 12.5",baffle spacing from 4" to 4.5",and mouth from 12" to 13.4" to keep area the same.I'm in new territory here,just assuming that's the way to do it.

Two of these really kick butt for HT... I watched War of the Worlds,and Terminator 3 last night...the house was a'shakin'!.. :-)

Here's the plans:

http://img236.imageshack.us/img236/5...lans002kn5.jpg
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Old 31st March 2007, 05:05 PM   #177
freddi is offline freddi  United States
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hey Don - KenL's K with 65" tall slot from ~1994 is the largest coupler shown to date (besides K's 12ft klam) - if was 19x19x66.5 then about same bulk as your TH

KenL's tractrix slot calculator
http://hometown.aol.com/klehma/

comment
http://snippets.org/pipermail/diyspe...ry/004482.html
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Old 31st March 2007, 09:54 PM   #178
djn is offline djn  United States
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Very cool Don. I can imagine these up in the floor joist and the openings next to my chair. That would really rock. How do they sound with music? Is the a lot of detail? Cheers.
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Old 1st April 2007, 01:47 PM   #179
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GM

(A combination of terms new to me, eg when you said “DBR = double bass reflex”, I thought you meant two woofers in one box – but now see it’s a bandpass; my ISP throttling me back to dial up speed; little time for a coupla days; and thinking one of your sims was in response to Freddy had me confused).

Anyhow ~

> A 'perfect' BLH is so well damped that it has no output above the driver's mass corner, and its sheer size so completely controls the driver that it physically delays its radiating output ('tail wagging the dog') . . In a sim, its impulse response is so straight/sharp it makes a 0.5 Qtc sealed's look like a vented's, relatively speaking

Perfection is being a little optimistic , but how do you avoid a midbass (ie not trying to plumb the depths) BLH being highly compromised, in particular – with minimal dip? - a larger chamber?

The baffle step could be handled by a circuit, and if the scoop were only used above the zone of room gain, things are simplified.


your post #145

> L = 31.375"
CSA = 640"^2 (suggest 32.187" w x 19.875" d)
driver at extreme top
vent at extreme bottom with a 640"^2 area,
so full width x 19.875" high

the driver is at the extreme top ~ of the baffle? is the baffle any particular size?
L is the length of the “line” ~ which can be any shape without extreme bends?
CSA?
And is the compression ratio any particular value?

And in the BLH sim, what are the red and blue lines?


Rather than answer the questions re the specific design, are there formulae you can post which I or others can use with different drivers etc?

Thanks again
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Old 1st April 2007, 06:32 PM   #180
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One thing I have found when simulating the tapped horn in hornresp is that most prodrivers have way to low mass to be any usefull. I think even the Eminence LAB 12 driver has to weak motorsystem and too low mass. I just simulated a huge tapped horn with two Ciare 18.00 SW driver in an isobaric configuration. (face to face).
It looks something like this: Click the image to open in full size.
Notice how the two peaks are quite similar in amplitude. That is with 720 gram mass and a BL of 61!!!!
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