Midbass J horn - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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
Reply
 
Thread Tools Search this Thread
Old 12th December 2006, 11:28 AM   #1
tade is offline tade  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Ralieigh nc
Send a message via AIM to tade
Default Midbass J horn

I want to build a mid bass J horn to cover the kick drum area from eighty to maybe 500 hz. i will cross over to midrange probably around 150-200hz. That way I can put my two subs in optimal places in the room for below that, and whatever can handle the midrange and treble above.

I want it to be full size for its bandwidth.

I want to fudge compression drivers out of a pair Hi Vi B4N four inch aluminum cone woofers:

http://www.partsexpress.com/pe/pshow...TOKEN=17170838

That cone almost looks like a compression driver itself. Efficiency is absent but i figure with horn loading it will improve. I also like the idea of a four inch driver producing bass if it can, it should be quick. How should I figure out what size to make the throat and the front and rear chambers.

Many thanks and advice is welcome.
  Reply With Quote
Old 12th December 2006, 11:51 AM   #2
Banned
 
Join Date: Feb 2004
Location: Portal 2012
After horn loading that little 4" inefficient driver and building a full size horn you'll be lucky to end up with the sound of a good 10" direct radiator. IMO way too much work for the end performance - plus it will be quite large
  Reply With Quote
Old 12th December 2006, 12:40 PM   #3
tade is offline tade  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Ralieigh nc
Send a message via AIM to tade
you know, i bet you are right. I should save the effort and save up for some PA tens.
  Reply With Quote
Old 12th December 2006, 02:30 PM   #4
diyAudio Member
 
Join Date: Feb 2002
I like the basic idea, but Magnetar is right - the HiVi's are pretty much useless for this application. No efficiency, and no motor strength. I looked at using 4 of the B3N's in a Unity prototype, and even 4 of them horn loaded only get into the low 90's, and bandwidth was disappointing (according to sims, never built it).
  Reply With Quote
Old 12th December 2006, 02:48 PM   #5
tade is offline tade  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Ralieigh nc
Send a message via AIM to tade
what is good about compression driver midbass horns? The super high efficiency?
  Reply With Quote
Old 12th December 2006, 02:57 PM   #6
tade is offline tade  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Ralieigh nc
Send a message via AIM to tade
this is what sparked my interest:
http://www.audiofederation.com/blog-images/IMG_9227.jpg

http://audiofederation.com/blog-images/IMG_9234.jpg
  Reply With Quote
Old 28th December 2006, 11:49 AM   #7
diyAudio Member
 
Join Date: Dec 2002
Location: dry ol Melbourne Australia
Somewhere there is a site with a clever project by a Swedish guy called matheus (sp??), to accomodate that horns really only behave like ideal horns when the WL inside the horn is several times shorter than the horn length, and allow this where floorpsace is limited, by a 90 degree midbass J horn (using IIRC a 15" JBL driver) - with a good "how I did it section"

It sounded like a very good way to get sufficient length for good performance down to about 80 Hz, "using height rather than length".

Does anyone have the link?

thanks
  Reply With Quote
Old 2nd January 2007, 06:29 AM   #8
Banned
 
Join Date: Dec 2006
Location: So. California
Quote:
Originally posted by tade
what is good about compression driver midbass horns? The super high efficiency?
Yes, the super high efficiency and the uniform dispersion, but not the fidelity. I installed some in large auditoria (but now avoid the use of fiber-glass MB horns due to ringing)
  Reply With Quote
Old 2nd January 2007, 08:53 AM   #9
diyAudio Member
 
Join Date: Dec 2002
Location: dry ol Melbourne Australia
Steve Schell who posts at the High Efficiency Speaker Asylum is developing new compression drivers midbass horns.

http://db.audioasylum.com/cgi/m.mpl?...ad&r=&session=

and others here

http://db.audioasylum.com/cgi/m.mpl?...ad&r=&session=

Steveis I think are for domestic use rather than auditoria. I don't know if fiber-glass, more likely I think with wood.


Cheers
  Reply With Quote
Old 2nd January 2007, 12:01 PM   #10
diyAudio Member
 
Join Date: Dec 2002
Location: dry ol Melbourne Australia
There's also this thread referring to two bass horn with 15" drivers:
Steve's bass J horn (no links, but Steve can email sketches); and
Mathias *U bass horn (link gone, but drawings there)

http://www.audioasylum.com/scripts/t.pl?f=hug&m=117170
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Straight front-horn for midbass EspenE Multi-Way 1 31st January 2009 05:17 PM
Midbass Conical Horn - Keele vs Hornsresp which is the better FR? steve71 Multi-Way 28 27th October 2008 07:35 PM
cost and sound-effective midbass horn - what works well?l freddi Multi-Way 0 13th November 2007 09:51 PM
dB Room gain in a midbass horn rick57 Multi-Way 2 13th January 2005 12:34 PM


New To Site? Need Help?

All times are GMT. The time now is 02:13 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2