Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

<Two Sheets, 43Hz Folded Horn
<Two Sheets, 43Hz Folded Horn
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 22nd January 2018, 06:33 PM   #11
Doppler9000 is offline Doppler9000  Canada
diyAudio Member
 
Join Date: Apr 2010
Quote:
Originally Posted by StainlessSteve View Post
Um, could I see some measurements on these?
Does anyone else find it rude when someone starts a post with "Um", as if they are questioning the intelligence or diligence of the person they are responding to?

If they are asking for free help from a stranger, perhaps something like "Do you have measurements you could share?" might be more polite.
  Reply With Quote
Old 22nd January 2018, 06:44 PM   #12
StainlessSteve is offline StainlessSteve  United States
diyAudio Member
 
StainlessSteve's Avatar
 
Join Date: May 2015
The reason I said that is because this is a publicly available driver and someone who were to design a fold should be benefiting themselves and a lot of others

Last edited by StainlessSteve; 22nd January 2018 at 07:06 PM.
  Reply With Quote
Old 22nd January 2018, 09:38 PM   #13
chris661 is offline chris661  United Kingdom
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Quote:
Originally Posted by Doppler9000 View Post
Does anyone else find it rude when someone starts a post with "Um", as if they are questioning the intelligence or diligence of the person they are responding to?

If they are asking for free help from a stranger, perhaps something like "Do you have measurements you could share?" might be more polite.
They're W-bins, and unlikely to reach particularly low. While I take your point, I can understand why the poster in question might be skeptical.

To the original poster, I've built a set of eight 15" subs that're around 70L internal (<3 cu.ft), which are good for over 120dB from 40Hz upwards. You need good drivers and a lot of power.

Chris
__________________
My work: www.grimshawaudio.com
  Reply With Quote
Old 22nd January 2018, 09:43 PM   #14
nigelwright7557 is offline nigelwright7557  United Kingdom
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Quote:
Originally Posted by Doppler9000 View Post
Does anyone else find it rude when someone starts a post with "Um", as if they are questioning the intelligence or diligence of the person they are responding to?

If they are asking for free help from a stranger, perhaps something like "Do you have measurements you could share?" might be more polite.
If the w bin was scaled up a bit to get more internal volume then it would probably go a bit lower. The right driver too would help.
w bins are very efficient spl wise, about twice that of a sealed box.
__________________
PCBCAD51 pcb design software. 2018 version out now with lower prices >> http://www.murtonpikesystems.co.uk
  Reply With Quote
Old 22nd January 2018, 09:43 PM   #15
scottjoplin is offline scottjoplin  Wales
diyAudio Member
 
scottjoplin's Avatar
 
Join Date: Dec 2015
Location: Penrhyndeudraeth
Quote:
Originally Posted by Doppler9000 View Post
Does anyone else find it rude when someone starts a post with "Um", as if they are questioning the intelligence or diligence of the person they are responding to?
Um, no, can't say I analysed it
__________________
Woofer Assisted Wideband is the New Testament renounce the anachronistic acronym FAST
  Reply With Quote
Old 22nd January 2018, 09:51 PM   #16
scottjoplin is offline scottjoplin  Wales
diyAudio Member
 
scottjoplin's Avatar
 
Join Date: Dec 2015
Location: Penrhyndeudraeth
Quote:
Originally Posted by nigelwright7557 View Post
w bins are very efficient spl wise, about twice that of a sealed box.
Aren't horns mainly about coupling better to the air and throwing the sound farther? This would require higher efficiency than a sealed box granted
__________________
Woofer Assisted Wideband is the New Testament renounce the anachronistic acronym FAST
  Reply With Quote
Old 22nd January 2018, 10:19 PM   #17
Brian Steele is offline Brian Steele  Grenada
diyAudio Member
 
Join Date: Nov 2007
Not really a horn, but an offset MLTL can get you there within the constraints listed (One sheet of ply might be enough, in fact).

A sealed W-bin will have to be huge to get down to 43 Hz, and so will exceed the material limit of <2 sheets of ply.

A vented W-bin that's small enough to use less than 2 sheets of ply still provides gain at the wrong frequencies, so that's a no-go either.

A suitably-designed TH can get you close (e.g. my POC3, or a larger version of the THAM12). The problem here is that the upper cutoff frequency may not meet the 130 Hz limit. You might be able to get it reasonably flat between 100 Hz to 200 Hz on paper with stuffing between S1 and S2.

But I suspect that StainlessSteve might already have a solution
Attached Images
File Type: png 2018-01-22.png (21.3 KB, 202 views)
File Type: png 2018-01-22 (1).png (10.7 KB, 200 views)
__________________
www.diysubwoofers.org
  Reply With Quote
Old 22nd January 2018, 10:36 PM   #18
StainlessSteve is offline StainlessSteve  United States
diyAudio Member
 
StainlessSteve's Avatar
 
Join Date: May 2015
I don't. I'm trying to use a folded horn within 60ish cubic feet down to 45hz up to 135hz at +129dB. What is the maximum SPL of this design and maximum SPL simulated spectrogram+group delay and phase?
  Reply With Quote
Old 22nd January 2018, 11:03 PM   #19
bjorno is offline bjorno  Sweden
diyAudio Member
 
Join Date: Mar 2005
Location: Jacobsmountain
Send a message via MSN to bjorno
Hi All,

FYI:

b
Attached Images
File Type: jpg B&C_12PLB100.JPG (744.2 KB, 165 views)
  Reply With Quote
Old 22nd January 2018, 11:06 PM   #20
Brian Steele is offline Brian Steele  Grenada
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally Posted by StainlessSteve View Post
I don't. I'm trying to use a folded horn within 60ish cubic feet down to 45hz up to 135hz at +129dB. What is the maximum SPL of this design and maximum SPL simulated spectrogram+group delay and phase?
Well, the MLTL design won't hit 129dB unless you put it in a corner, LOL. At that point 450W will give just over 130dB down to 40 Hz, but that's assuming no vent or power compression.
__________________
www.diysubwoofers.org
  Reply With Quote

Reply


&lt;Two Sheets, 43Hz Folded HornHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
jbl gto804 tapped horn/ folded horn 2009thread1 Subwoofers 103 6th December 2015 06:26 PM
Folded horn vs Tapped horn heathxspaz Subwoofers 17 7th January 2015 07:12 AM
Folded horn - volume between subwoofer cone ane th start of the horn benpalmer Subwoofers 8 9th April 2012 01:10 PM
Entering horn meaurements fora folded horn (hornsrep) Tidy Max Software Tools 3 21st February 2011 02:28 AM
how to go from horn response to a folded bass horn design? paulspencer Subwoofers 8 4th November 2005 10:44 PM


New To Site? Need Help?

All times are GMT. The time now is 12:31 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki