Which BLH for linear response down to 40Hz? - Page 3 - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

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 4th September 2005, 07:21 AM   #21
diyAudio Member
 
Join Date: Aug 2003
Location: Calgary on the Bow
Default After this I give up

http://www.diy-systems.com/wwwboard/...ry.php?id=9586
This seems to work they must have made an abrieviation of some kind on the post. I tried this address and it works. Regards Moray James.
__________________
moray james
  Reply With Quote
Old 4th September 2005, 11:33 AM   #22
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Thanks!!
I already downloaded the plans in a few hours ago.
I don't know whats going on the Net, but I almost lost in the wirtual space..... :-))

Maybe I will try the Singular, but first I am looking for a "true" BLH speaker with ca. 40Hz linear response.

Thanks and Greets:

Tyimo
  Reply With Quote
Old 5th September 2005, 08:04 AM   #23
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Quote:
Originally posted by Tyimo
Hi!


Scottmoose! I belive in the Hedlund and I would like to make some simulation with MJK's software too. In another thread I already asked about the Hedlund's correct measurements, but I will ask here too:
-what is the correct St (3x23cm?)
-what is the correct Sm (65x23cm?)
-what is the correct line lenght?
-what is the horn contour? exponential?

Tyimo
I'll have to dig the data out -its on an old hard-disk that's not in my PC at the moment, but I'll post it in a day or two. It might be a little off, but it'll provide a rough starting point / guide.
Scott
__________________
Community site www.frugal-horn.com Commercial site www.wodendesign.com
  Reply With Quote
Old 5th September 2005, 04:50 PM   #24
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Thanks Scott!!!!!
I am waiting!

Greets:

Tyimo
  Reply With Quote
Old 13th September 2005, 01:09 PM   #25
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Hi Scott!

Can you find the data???
I have already the original Hedlunds plan, but I don't know what is the real horn line lenght?

Tyimo
  Reply With Quote
Old 13th September 2005, 08:36 PM   #26
squalor is offline squalor  United States
diyAudio Member
 
squalor's Avatar
 
Join Date: May 2005
Location: Redneck Riviera
psst...............wanna see my Dallas?
http://fullrangedriver.com/gallery/a...017/Dhorn8.JPG
  Reply With Quote
Old 14th September 2005, 01:38 AM   #27
diyAudio Member
 
Join Date: Aug 2003
Location: Calgary on the Bow
Default BLH design

Have you looked ar this back loaded horn design by Onur Ilkorur? Excellent fo Fostex Fe206e or AER etc.
http://www.yildiz.edu.tr/~ilkorur/sp...tex_fe206e.htm
Regards Moray James.
__________________
moray james
  Reply With Quote
Old 14th September 2005, 09:55 AM   #28
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Quote:
Originally posted by Tyimo
Hi Scott!

Can you find the data???
I have already the original Hedlunds plan, but I don't know what is the real horn line lenght?

Tyimo

Blast! Sorry, I forgot. Will dig it out -expect a post later today. I need to dig some gen. off that old hard drive anyway for my thesis.
Cheers
Scott
__________________
Community site www.frugal-horn.com Commercial site www.wodendesign.com
  Reply With Quote
Old 14th September 2005, 12:05 PM   #29
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Right, found it (at last!).

At the time I did this, I was using Martin's MathCad worksheets to compare the results different horn desings would give using the same driver, in this case the good old Fostex FE206E. Whilst the Hedlund was designed for Lowther drivers, the Fostex specifications are usually relatively close to Lowthers, and I didn't want to introduce another variable (i.e. different driver types) into the comparison. As you can see, the response curve using the 206 isn't too bad. There's a fair bit of ripple, but nowhere near as much as some designs I've seen (and would rather not!) -the Jerrico, and several of the Fostex Factory designs spring to mind as immediate examples. Besides, horns are not known for an overly even response curve!

Approximate dimensions used were: Horn length 129"; mouth area 6.8Sd, throat area 0.25Sd. These were roughly calculated from Jan Hedlund's original drawings -certainly not exact, but they'll be near enough to give a general idea as to what's going on.

With, say, a DX3, I'd expect much the same cut-off point, (or perhaps a little higher) but higher spls below 100Hz -probably dropping somewhat around this point, then levelling off. If I'm correct in guessing this, then the 206 might well be a better match, as it's resonse falls away, but probably in step with room gain.

Hope some of this is useful
Best
Scott
Attached Images
File Type: jpg 1.jpg (50.5 KB, 569 views)
__________________
Community site www.frugal-horn.com Commercial site www.wodendesign.com
  Reply With Quote
Old 14th September 2005, 12:07 PM   #30
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Woofer & Mouth Far-Field SPLs:
Attached Images
File Type: jpg 2.jpg (52.8 KB, 524 views)
__________________
Community site www.frugal-horn.com Commercial site www.wodendesign.com
  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
really weird linear potentiometers that have a logarithmic response VvvvvV Instruments and Amps 8 30th March 2007 10:00 PM
Which Horn for linear response down to 20Hz? Bass-Depth Subwoofers 81 2nd September 2005 02:59 AM
Active crossover with linear response ackcheng Multi-Way 0 19th July 2004 05:15 PM


New To Site? Need Help?

All times are GMT. The time now is 12:51 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