Hornresp - Page 274 - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 17th June 2012, 07:48 PM   #2731
Mark Kravchenko
diyAudio Member
 
mwmkravchenko's Avatar
 
Join Date: Jan 2002
Location: Perth Canada
Quote:
what i get out af al reply's ,high cr is certenly doable but you need a sort of phase plug/rings to compensate path differences.
No.

The phase plugs are there for the purposes of pushing up high frequency response. That was the purpose of the papers posted by Mr. |Geiger. The papers were written to describe means and methods used to push up high frequency response of drivers in high frequency horns. As stated before you can push up the efficiency of a bass horn by means of the compression ratio. But you have to choose your balancing. Many drivers will survive higher pressures than you might think in the home setting. Truth to be told is that we don't push them all that hard for long periods of time. So bottom line is experiment, simulate, and carefully layout your horns. If you build them as per your simulation hornresp is very accurate at predicting what they will perform like.



1 pascal = 0.000 145 037 738 01 pound/square inch.

So roughly ten thousand pascals to one PSI.

Choosing the right cone makeup will let you work with higher pressures. So pick a cone that you can't deform to easily with your hands.
__________________
Mark
www.kravchenko-audio.com
  Reply With Quote
Old 17th June 2012, 09:35 PM   #2732
tb46 is offline tb46  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Texas
Hi mwmkravchenko,

"...pushing up high frequency response..."

I just posted a mid-range horn with the Selenium 10PW3 in Post #188 here: Bass for my soldier Do you think it will make 2kHz?

Regards,
__________________
Oliver
  Reply With Quote
Old 17th June 2012, 09:59 PM   #2733
Mark Kravchenko
diyAudio Member
 
mwmkravchenko's Avatar
 
Join Date: Jan 2002
Location: Perth Canada
Some basics.

Your throat must be smaller than the wavelength of sound you wish to create. If it is larger than the upper frequency you wish to reproduce it will not work so well.

Next.

You need a driver that will get you this high in frequency response anyway. This is directly related to the drivers voice coil inductance. Remember that to large an inductance cuts out high frequency. And there is pretty much nothing you can do about it.

Driver choice is very important. So as a quick way to figure out the high frequency response try the driver out in hornresp in a sealed or vented enclosure. The low end is unimportant take a look at the high frequency response.
__________________
Mark
www.kravchenko-audio.com
  Reply With Quote
Old 17th June 2012, 11:32 PM   #2734
tb46 is offline tb46  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Texas
Hi Mark,

Thanks, I've tried this, and the sealed response is down 6dB @ 200 and 2kHz. The wavefront simulator in the horn version actually still looks good @ 2kHz.
I'll attach the Hornresp Input screen.

Regards,
Attached Images
File Type: jpg Selenium_10PW3_mid.jpg (34.6 KB, 228 views)
__________________
Oliver
  Reply With Quote
Old 18th June 2012, 12:35 AM   #2735
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
2Pi loading means the speaker is on a boundary for all frequencies in the passband. Wavelength of 2kHz is ~170mm
__________________
regards Andrew T.
  Reply With Quote
Old 18th June 2012, 08:59 AM   #2736
diyAudio Member
 
Join Date: Jun 2007
Quote:
Originally Posted by mwmkravchenko View Post
So roughly ten thousand pascals to one PSI.
Less roughly, 6895 Pa = 1 psi :-).

Kind regards,

David
__________________
www.hornresp.net
  Reply With Quote
Old 18th June 2012, 12:47 PM   #2737
Mark Kravchenko
diyAudio Member
 
mwmkravchenko's Avatar
 
Join Date: Jan 2002
Location: Perth Canada
Hard to argue when you're right.

Thanks for the correction.
__________________
Mark
www.kravchenko-audio.com
  Reply With Quote
Old 18th June 2012, 03:24 PM   #2738
tb46 is offline tb46  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Texas
Hi David,

I found something I don't understand (well, nothing new there). Going into an existing simulation, I went to Edit/Tools/System Design/From Specification/Yes/200/2000/OK, and the program calculated new horn values for S1/S2/Hyp. That was expected. But then I noticed that the program also changed the Mmd from 12.89 to 1.61. Bug, or feature? Version 29.10 Product Number 2910-120519.

Regards,
Attached Images
File Type: jpg Before_System_Design_Input.jpg (32.7 KB, 158 views)
File Type: jpg After_System_Design_Input.jpg (32.1 KB, 159 views)
__________________
Oliver
  Reply With Quote
Old 18th June 2012, 03:33 PM   #2739
epa is offline epa  Netherlands
diyAudio Member
 
Join Date: Apr 2010
Location: amsterdam
not sure ,but i think what it means that the horn throat is specified and and it "creates" the ideal driver.
oliver,why not give jbell a pm,ask his findings(he's been there done that.
grtz erik
__________________
one good thing about music ,when it hit you feel no pain.
so hit me with music
. hr driver db

Last edited by epa; 18th June 2012 at 03:40 PM.
  Reply With Quote
Old 18th June 2012, 04:47 PM   #2740
Kolbrek is offline Kolbrek  Norway
diyAudio Member
 
Kolbrek's Avatar
 
Join Date: Aug 2007
Quote:
Originally Posted by tb46 View Post
Hi David,

I found something I don't understand (well, nothing new there). Going into an existing simulation, I went to Edit/Tools/System Design/From Specification/Yes/200/2000/OK, and the program calculated new horn values for S1/S2/Hyp. That was expected. But then I noticed that the program also changed the Mmd from 12.89 to 1.61. Bug, or feature? Version 29.10 Product Number 2910-120519.

Regards,
If you want to keep the driver, you should use System Design/With Driver. System Design From Specification also calculates driver parameters, but I have never seen a case where only Mmd changes. Usually other driver parameters change as well.

Regards,

Bjørn
  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
Hornresp Class FlipC Subwoofers 8 3rd November 2008 07:23 PM
Some questions about hornresp brsanko Full Range 4 18th October 2008 10:36 PM
Hornresp help / JX150 316a Multi-Way 0 11th February 2004 04:56 PM


New To Site? Need Help?

All times are GMT. The time now is 06:58 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