Any Chance that an OB/back loading horn hybrid will work?

borispm · 30th May 2010, 03:54 PM

The diagram says it all, but will this actually work? I am curious about it after thinking about it for a night.

borispm · 30th May 2010, 04:16 PM

Sorry for my bad English illustration and the " technical notes" that is not really technically correct.

mp9 · 30th May 2010, 04:26 PM

Open baffle is when the driver is mounted with nothing interfering with the back side of the driver and it's rear wave. If the back of the driver is enclosed in a horn compression chamber as it would have to be to function as a BLH and how it looks to be in the illustration, it can't be a open baffle. No matter how narrow the horn path the driver is still enclosed. What you drew looks like a large supra baffle, that's all.

Cal Weldon · 30th May 2010, 04:39 PM

Yes provided the horn length is long enough and mouth is wide enough it will work. That might mean making it taller than shown.

rjbond3rd · 31st May 2010, 12:04 AM

Horn action depends on pressure.

borispm · 31st May 2010, 09:11 AM

@mp9
Sorry for my bad naming, it shouldn't be called a real OB but a leaky horn (oh, this name reminds me of those leaky dripping sewage pipe...err).
Maybe my illustration is bad, the driver is not fully enclosed to the horn mouth, so that's not an oversized baffle on a horn.
@Cal

The Vifa has a F0 of about 115Hz so I assume something like 1.2m will work good enough as I hate muddy and one-note bass. Please let me know if I am wrong about this.

What I worry is that my design features a leaky horn, only a proportion of the rear radiating wave joins the horn chamber, and will that be a problem?
The horn mouth is on the narrow side (about 1"), and I dunno if that's a good thing...

human.bin · 1st June 2010, 01:11 AM

if the decaware zen OB + tuned chamber is working, then no reason this will 'work' in some way... it will for sure affect the sound somehow

BudP · 1st June 2010, 01:22 AM

You could just have a set of plates running back from the driver, the width of the entire driver and have a tall, narrow,deep, open ended box, with hanging stuffing and a long enough path length to provide a cardioid bass box. You might even provide a horn flare within those side plates to help smooth the loading.

Putting foam on the back of the driver to attempt to seal a portion of the cone surface to the horn might work, if you EnABL the driver to rid it of spurious patterns of front wave mission. I don't think you will get much benefit doing this until you have some decent amount of cone surface to work with. Intriguing idea though.

Bud

GM · 1st June 2010, 01:32 AM

Quote:

Originally Posted by borispm

What I worry is that my design features a leaky horn, only a proportion of the rear radiating wave joins the horn chamber, and will that be a problem?

Not if the horn's design takes it into consideration, i.e the horn is under-damped enough to need a leak to bleed off its excess 'boom'. It's a common way to match a high Q driver to a horn designed for a low Q one.

GM

borispm · 1st June 2010, 02:14 AM

Thanks for your replies, gentlemen. However, can Mr. Human.bin tell me more about the decaware thing? I haven't seen it before...

Re GM
Is my shorter than normal horn itself already suitable for high Q drivers? If I follow what Fostex usually do I should have made it 1.4m instead of 1.2m... In this case, will it be better for me to make it 1.4m as it is a leaky one?
The Vifa TG9FD10-04 is used in this case, which has a relatively high Qts (0.73).

30th May 2010, 04:39 PM	#4
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Yes provided the horn length is long enough and mouth is wide enough it will work. That might mean making it taller than shown. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

1st June 2010, 01:22 AM	#8
BudP diyAudio Member Join Date: Feb 2007 Location: upper left crust, united snakes	You could just have a set of plates running back from the driver, the width of the entire driver and have a tall, narrow,deep, open ended box, with hanging stuffing and a long enough path length to provide a cardioid bass box. You might even provide a horn flare within those side plates to help smooth the loading. Putting foam on the back of the driver to attempt to seal a portion of the cone surface to the horn might work, if you EnABL the driver to rid it of spurious patterns of front wave mission. I don't think you will get much benefit doing this until you have some decent amount of cone surface to work with. Intriguing idea though. Bud __________________ "You and I and every other thing are a dependent arising, empty of any inherent reality" Tsong Ko Pa

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Front & rear end DUAL Back Loaded Horn + Bass Reflex Hybrid Enclosure	nickthevoice	Multi-Way	13	19th May 2009 03:09 PM
My wacky idea for a hybrid horn loaded woofer/planar widerange hybrid loudspeaker.	Spasticteapot	Multi-Way	0	30th November 2006 04:16 AM
Help with horn loading	Web Wolf	Multi-Way	3	25th October 2006 06:38 PM
Isobaric loading, would this setup work???	swin1	Multi-Way	3	20th May 2006 03:58 PM
Not sure how to make a front/back loaded horn work ?	audioaction	Full Range	9	1st April 2006 06:59 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

30th May 2010, 04:16 PM	#2
borispm diyAudio Member Join Date: May 2010 Blog Entries: 1	Sorry for my bad English illustration and the " technical notes" that is not really technically correct.

30th May 2010, 04:26 PM	#3
mp9 diyAudio Member Join Date: Jun 2006	Open baffle is when the driver is mounted with nothing interfering with the back side of the driver and it's rear wave. If the back of the driver is enclosed in a horn compression chamber as it would have to be to function as a BLH and how it looks to be in the illustration, it can't be a open baffle. No matter how narrow the horn path the driver is still enclosed. What you drew looks like a large supra baffle, that's all.

31st May 2010, 12:04 AM	#5
rjbond3rd diyAudio Member Join Date: Jan 2007	Horn action depends on pressure.

31st May 2010, 09:11 AM	#6
borispm diyAudio Member Join Date: May 2010 Blog Entries: 1	@mp9 Sorry for my bad naming, it shouldn't be called a real OB but a leaky horn (oh, this name reminds me of those leaky dripping sewage pipe...err). Maybe my illustration is bad, the driver is not fully enclosed to the horn mouth, so that's not an oversized baffle on a horn. @Cal The Vifa has a F0 of about 115Hz so I assume something like 1.2m will work good enough as I hate muddy and one-note bass. Please let me know if I am wrong about this. What I worry is that my design features a leaky horn, only a proportion of the rear radiating wave joins the horn chamber, and will that be a problem? The horn mouth is on the narrow side (about 1"), and I dunno if that's a good thing...

1st June 2010, 01:11 AM	#7
human.bin diyAudio Member Join Date: May 2008	if the decaware zen OB + tuned chamber is working, then no reason this will 'work' in some way... it will for sure affect the sound somehow

1st June 2010, 02:14 AM	#10
borispm diyAudio Member Join Date: May 2010 Blog Entries: 1	Thanks for your replies, gentlemen. However, can Mr. Human.bin tell me more about the decaware thing? I haven't seen it before... Re GM Is my shorter than normal horn itself already suitable for high Q drivers? If I follow what Fostex usually do I should have made it 1.4m instead of 1.2m... In this case, will it be better for me to make it 1.4m as it is a leaky one? The Vifa TG9FD10-04 is used in this case, which has a relatively high Qts (0.73).

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)