Hemp 8" Coax and Tractrix horn?

bambadoo · 24th May 2007, 07:39 AM

Puzzling with some ideas regarding the new 8" Hempacoustics CO8V
http://hempacoustics.com/CO8V_-_Hemp...heet_ready.pdf
Implemented in a 250hz Tractrix horn.
http://www.bd-design.nl/

And maybe combined with 2 pcs. hempacoustics 15" OB woofers.
http://hempacoustics.com/SW15OB_-_He...heet_ready.pdf

Cany anyone comment on this project?
BTW. I have made some speakers, but have not made the jump into horn building yet.
And I have good faith in hemp drivers

Best Regards

GM · 25th May 2007, 12:57 AM

Greets!

Assuming the specs are ~correct, the CO8V has 2*Fs/Qes = 200 Hz mass corner, so a 250 Hz Tractrix horn is way too small for it. You'll need a simple waveguide (WG) at this cut-off, otherwise it's best suited for a BLH.

The woofers are so much more efficient that with two you'll have to roll one off, using it only for LF 'fill'.

Anyway, while some compromise loading can be reached to fill in the huge mid/HF dip, making this combo work from top to bottom isn't for a novice horn designer IMO unless you just want to keep at it until you can get it right enough through trial and error building.

GM

CLS · 25th May 2007, 02:28 AM

I have a pair of Oris 150, & get interested in CO8V, too.

I got reply from Hemp Accoustics stated that they haven't had any experiences on front horn (about this driver).

<Perhaps we can do some modeling and see what we come up with. > This is the last sentence of that reply. However I haven't heard anything since then. That was last month.

Or maybe someone can bridge Hemp Accoustics & BD Design?

GM · 25th May 2007, 02:48 AM

Greets!

You can try gapping it to the 150, letting the excess gain be rolled off by the dipole effect. It probably won't help the wide BW dip higher up enough though, but only one way to know for sure.

GM

bambadoo · 25th May 2007, 06:13 AM

Told you. I am a new beginner when it comes to horn design, but I am a fast learner.

24th May 2007, 07:39 AM	#1
bambadoo diyAudio Member Join Date: Feb 2003 Location: West Coast of Norway	Hemp 8" Coax and Tractrix horn? Puzzling with some ideas regarding the new 8" Hempacoustics CO8V http://hempacoustics.com/CO8V_-_Hemp...heet_ready.pdf Implemented in a 250hz Tractrix horn. http://www.bd-design.nl/ And maybe combined with 2 pcs. hempacoustics 15" OB woofers. http://hempacoustics.com/SW15OB_-_He...heet_ready.pdf Cany anyone comment on this project? BTW. I have made some speakers, but have not made the jump into horn building yet. And I have good faith in hemp drivers Best Regards

25th May 2007, 12:57 AM	#2
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Greets! Assuming the specs are ~correct, the CO8V has 2*Fs/Qes = 200 Hz mass corner, so a 250 Hz Tractrix horn is way too small for it. You'll need a simple waveguide (WG) at this cut-off, otherwise it's best suited for a BLH. The woofers are so much more efficient that with two you'll have to roll one off, using it only for LF 'fill'. Anyway, while some compromise loading can be reached to fill in the huge mid/HF dip, making this combo work from top to bottom isn't for a novice horn designer IMO unless you just want to keep at it until you can get it right enough through trial and error building. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

25th May 2007, 02:48 AM	#4
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Greets! You can try gapping it to the 150, letting the excess gain be rolled off by the dipole effect. It probably won't help the wide BW dip higher up enough though, but only one way to know for sure. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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25th May 2007, 02:28 AM	#3
CLS diyAudio Member Join Date: Jun 2005 Location: Taiwan	I have a pair of Oris 150, & get interested in CO8V, too. I got reply from Hemp Accoustics stated that they haven't had any experiences on front horn (about this driver). <Perhaps we can do some modeling and see what we come up with. > This is the last sentence of that reply. However I haven't heard anything since then. That was last month. Or maybe someone can bridge Hemp Accoustics & BD Design?

25th May 2007, 06:13 AM	#5
bambadoo diyAudio Member Join Date: Feb 2003 Location: West Coast of Norway	Told you. I am a new beginner when it comes to horn design, but I am a fast learner.

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