Tappedhorn with 18Sound 18W1000 - Page 3 - diyAudio
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Old 24th July 2013, 07:59 PM   #21
epa is offline epa  Netherlands
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if you put the driver further down the throat(longer L3-L4shorter L1-L2)the dip around 120 hz wil get smaller.
the first part of the horn doesn't need to be tapered.
other then that it looks quite ok to me.
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Last edited by epa; 24th July 2013 at 08:04 PM.
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Old 24th July 2013, 08:21 PM   #22
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Just a quick question, do you already have the 18w1000?

If not why not the 18lw2400 for $29 more each....329 with free shipping at loudspeakersplus.com
4" VC and more Xmax.

http://www.loudspeakersplus.com/prod...SOUND18LW2400/

Looks like they both have 4" VC but the 2400 has a heavier (most likely stiffer) cone

Last edited by m R g S r; 24th July 2013 at 08:25 PM.
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Old 24th July 2013, 08:43 PM   #23
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@m R g S r

The 18Sound 18W1000 costs 269€ @ Thomann.de

The 18Sound 18LW2400 costs 315€ and got higher QTS and a lower Bl.

@ Epa

when I do this, the dip will get smaller, youre right but the peak @ 46Hz gets higher.
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Old 30th July 2013, 02:24 PM   #24
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Okay Guys, this my Plan:

Input 100Watt:

http://image-upload.de/image/RBAawl/f52aa671f0.jpg

Those are the Dimensions of the wood panels:

Wood panels Dimensions : ~Area :

Baffle -> 553mm x 500mm J -> 0,2765qm
S1 -> 120mm x 500mm J -> 0,1qm
S2 -> 463mm x 500mm J -> 0,2315qm
Front -> 313mm x 500mm J -> 0,1565qm
Top / Bottom -> 949mm x 500mm J -> 1qm
Back -> 822mm x 500mm J -> 0,5qm
Side -> 949mm x 860mm J -> 1,7qm

Bracings:
Top right -> 137mm x 500mm J -> 0,1qm
Top left -> 264mm x 500mm J -> 0,15qm
Bottom left -> 326mm x 500mm J -> 0.17qm

The other bracings will be cut by hand.


Volume :
Netto : 339,785Liters
Brutto : 408Liters

Total Area:
4,5 qm

Price:
30,87€

*S2 means the woodpanel on the opposite of the baffle
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Old 30th July 2013, 03:34 PM   #25
jwmbro is offline jwmbro  United States
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Looks good to me. You're probably not close to xmax yet at 100W input.

Quote:
Originally Posted by wBorchers View Post

Total Area:
4,5 qm

Price:
30,87€

*S2 means the woodpanel on the opposite of the baffle
Where the §§§ can you find 4.5 sq m for 31 euros? What material are you using?
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Old 30th July 2013, 04:38 PM   #26
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1 sqm 19mm chipboard costs 6,49€ @ Obi

Excursion is fewer than in a Vented Enclousure, maximum ist 3,8mm @ 100Watts @ 54Hz

By the way I think the displacement calculation isnt correcty in Hornresp, the respone changes if you will simulate 1Watt in the loudspeaker wizard instead of 2,83V @ 8Ohm although its the same.

This is why i build a prototype, i cant test many speakers, thomann accepts
restitution without a reason within.


Here you can see what i mean:

http://image-upload.de/image/HYufF7/740edf865a.jpg

Last edited by wBorchers; 30th July 2013 at 04:53 PM.
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Old 30th July 2013, 05:06 PM   #27
jwmbro is offline jwmbro  United States
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wow, only, I think my Obi charges more for chipboard. I think I might have to check this week to see if I'm misremembering. Prices vary a lot between Obis.

Quote:
Originally Posted by wBorchers View Post
That's not a constant 2.83V, that's max power. ie. different voltage applied at each frequency, so that the real power used is always 1W. So much more than 2.83V applied at impedance maxima (hence the big upward spikes there, because you are driving with much more voltage), and less than 2.83V at impedance minima, causing the dips. That field is useful for entering the max thermal rated power of the driver, to see the absolute max SPL possible at each frequency as per mfg specs. It is however NOT any sort of transfer function curve.
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Last edited by jwmbro; 30th July 2013 at 05:08 PM.
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Old 30th July 2013, 05:18 PM   #28
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Okay ty, i understood^^
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Old 30th July 2013, 05:32 PM   #29
epa is offline epa  Netherlands
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hi there
excelent work
keep us posted on the bild(pics or it didn't happen)
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one good thing about music ,when it hit you feel no pain.
so hit me with music
. hr driver db
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Old 30th July 2013, 06:13 PM   #30
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Thank you Epa,
i´ll post pics when i got that money, i got no work now and have exactly 0,21€.


First i´ll put my AWX184 in that horn, its not best Respone, but good enough to test if the horn works, excursion is also fewer than in a vented enclousure.
The Horn will kill my ears in my 20qm room ^.^
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