Dual 8" tapped horn = TH-SPUD - diyAudio
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Old 5th December 2008, 08:32 PM   #1
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Default Dual 8" tapped horn = TH-SPUD

Danley sound labs is introducing a new tapped horn called
TH-SPUD

I think this is an interesting concept and so I tried to model a diy version.

I'm thinking of using two B&C 8NDL51 drivers. They have a 7 mm xmax which I think should be enough for my small living room.

Planned layout +/- 120 x120 x 25cm:

Click the image to open in full size.

Respons graph in Akabak with quarter wave resonating tube at 65Hz and 60Hz low pass:

Click the image to open in full size.

Hornresponse input:

Click the image to open in full size.

So what do you think? Will it work? Any design faults?
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Old 5th December 2008, 11:19 PM   #2
MaVo is offline MaVo  Germany
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I didnt sim it, but 7mm xmax sounds really low for this low tuning. Check at what input power it runs out of excursion.
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Old 6th December 2008, 07:32 AM   #3
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Yes the power handling of this is not so high.
It runs out of xmax at only 12V rms

Click the image to open in full size.

This should give around 118dB max with corner placement.
Would this be enough or should I better be looking for a more high excursion car audio driver? How would these car drivers compare on a distortion level against the PA driver I'm using now?
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Old 10th December 2008, 12:42 PM   #4
hm is offline hm  Europe
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Hello,

better try two enclosures,
different tuning,
3,7 and 2.5 m long,
you get a better IMP and lower movement,
look my double horns,
a double TH for 5"

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 10th December 2008, 01:50 PM   #5
Eva is offline Eva  Spain
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In a tapped horn the phase varies wildly across the passband and above. Using enclosures with different tuning is strongly not recommended, it results in bad summing or cancellation. Phase matching a mid/bass system and a tapped horn is already difficult enough.
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Old 10th December 2008, 01:56 PM   #6
hm is offline hm  Europe
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Hello,
did you read my double horns? :
SAXOPHON, TROMBONE, POSAUNE,
KORNETT and SUB FANFARE,
special the measurements,

best read "about what" in the middle:
http://www.hm-moreart.de/11.htm
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Old 21st December 2008, 11:54 PM   #7
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G'day geitmans

The Tang Band W8-740 looks great in a box like this. 12mm X-max helps out the power situation quite a bit, too.

Cheers

William Cowan
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Old 22nd December 2008, 01:08 PM   #8
djk is offline djk
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An interesting driver for a low profile box:

http://www.parts-express.com/pe/psho...38&ctab=2#Tabs

In an 18hz TH a series pair will be 96dB (at 20hz) in 2Pi and take 40V without exceeding x-max. Average about 118dB/40V, 2dB from 18hz~60hz.

Of course room gain or 1Pi loading would add to this.
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Old 23rd December 2008, 02:22 PM   #9
Clarkcr is offline Clarkcr  United States
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Anyone knwo where I can get that modeling software for my own folded horn project?

THANKS!!!! :-)
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Old 23rd December 2008, 03:11 PM   #10
djk is offline djk
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AkAbak and Hornresp are what is generally used here.

Hornresp is easier to learn.

Hornresp
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