Dual 8" tapped horn = TH-SPUD

geitmans · 5th December 2008, 09:32 PM

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:

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

Hornresponse input:

So what do you think? Will it work? Any design faults?

MaVo · 6th December 2008, 12:19 AM

I didnt sim it, but 7mm xmax sounds really low for this low tuning. Check at what input power it runs out of excursion.

geitmans · 6th December 2008, 08:32 AM

Yes the power handling of this is not so high.
It runs out of xmax at only 12V rms

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?

hm · 10th December 2008, 01:42 PM

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"

Eva · 10th December 2008, 02:50 PM

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.

hm · 10th December 2008, 02:56 PM

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

cowanaudio · 22nd December 2008, 12:54 AM

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

djk · 22nd December 2008, 02:08 PM

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.

Clarkcr · 23rd December 2008, 03:22 PM

Anyone knwo where I can get that modeling software for my own folded horn project?

THANKS!!!! :-)

djk · 23rd December 2008, 04:11 PM

AkAbak and Hornresp are what is generally used here.

Hornresp is easier to learn.

Hornresp

5th December 2008, 09:32 PM	#1
geitmans diyAudio Member Join Date: Oct 2002 Location: belgium	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: Respons graph in Akabak with quarter wave resonating tube at 65Hz and 60Hz low pass: Hornresponse input: So what do you think? Will it work? Any design faults?

10th December 2008, 01:42 PM	#4
hm diyAudio Member Join Date: Feb 2004 Location: near Hamburg Germany	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" __________________ community site http://www.hm-moreart.de commercial sites http://www.hm-moreart.de/29.htm+/50....66.htm+/72.htm +/75.htm+/78.htm+/80.htm+/81.htm+/82.htm+/85.htm+/88.htm+/91.htm+/103.htm+/109.htm

10th December 2008, 02:50 PM	#5
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	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. __________________ I use to feel like the small child in The Emperor's New Clothes tale

10th December 2008, 02:56 PM	#6
hm diyAudio Member Join Date: Feb 2004 Location: near Hamburg Germany	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 __________________ community site http://www.hm-moreart.de commercial sites http://www.hm-moreart.de/29.htm+/50....66.htm+/72.htm +/75.htm+/78.htm+/80.htm+/81.htm+/82.htm+/85.htm+/88.htm+/91.htm+/103.htm+/109.htm

22nd December 2008, 02:08 PM	#8
djk diyAudio Member Join Date: Feb 2001 Location: USA	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. __________________ Candidates for the Darwin Award should not read this author.


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6th December 2008, 12:19 AM	#2
MaVo diyAudio Member Join Date: Jan 2006 Location: Herne	I didnt sim it, but 7mm xmax sounds really low for this low tuning. Check at what input power it runs out of excursion.

6th December 2008, 08:32 AM	#3
geitmans diyAudio Member Join Date: Oct 2002 Location: belgium	Yes the power handling of this is not so high. It runs out of xmax at only 12V rms 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?

22nd December 2008, 12:54 AM	#7
cowanaudio diyAudio Member Join Date: Jul 2004 Location: Canberra, Australia	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

23rd December 2008, 03:22 PM	#9
Clarkcr diyAudio Member Join Date: Jun 2004 Location: Heath, TX	Anyone knwo where I can get that modeling software for my own folded horn project? THANKS!!!! :-) __________________ Wouldn't it be great to have a time machine that let you go back 5 minutes? C

23rd December 2008, 04:11 PM	#10
djk diyAudio Member Join Date: Feb 2001 Location: USA	AkAbak and Hornresp are what is generally used here. Hornresp is easier to learn. Hornresp __________________ Candidates for the Darwin Award should not read this author.

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