Waveguides and horns - Page 63 - diyAudio
Go Back   Home > Forums > Commercial Sector > Group Buys

Group Buys Members group buys

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 19th June 2011, 08:25 PM   #621
gedlee is offline gedlee  United States
diyAudio Member
 
Join Date: Dec 2004
Location: Novi, Michigan
Yes, if you remap the data to FFT bins at 44.1 kHz then I can live with that.

For a non detailed picture, minimum phase is probably OK. HOM are decidedly not minimum phase, nor is diffraction in general, but I don't know to what extent my approach is sensitive to this issue. I can plot the raw Magnitude only data, but then it would not be as clean as when the data is fit to the polar modes.
  Reply With Quote
Old 19th June 2011, 09:29 PM   #622
bwaslo is offline bwaslo  United States
diyAudio Member
 
bwaslo's Avatar
 
Join Date: May 2006
Location: Cinciinati, OH
Do you want me to do the Hilbert stuff, or will you?
  Reply With Quote
Old 19th June 2011, 10:28 PM   #623
bwaslo is offline bwaslo  United States
diyAudio Member
 
bwaslo's Avatar
 
Join Date: May 2006
Location: Cinciinati, OH
I got the crossovers adjusted a little better on those homebrew 18s crossed at 750Hz (took the waveguide level down) and have been listening today. Sound pretty good to my ear, don't know whether it would sound better crossed at 900 like originally intended, but quite nice as they are. I'm not hearing any odd honks or strange sounds, in fact the integration with the woofers is very good (these all subjective opinions of course, probably not worth a lot!). But they easily pass the "Elvis Costello" voice honk test!

I'll probably leave them this way until I get a MiniDsp and try some active crossover/delay/PEQ circuits (on the theory that it will be easier than working with the box of inductors and caps and resistors I have now for tossing together passive crossovers). I'll be taking them to the MWAF crossed over at this very low point probably (though will probably kick up the highs a little to compensate for the expected drop when I get the foam from Earl). Anyway, based on this experiment I'd still be in favor of driving a SEOS-18 from a 1" DE250, certainly before I'd mess with adding a separate tweeter on top.
  Reply With Quote
Old 19th June 2011, 11:53 PM   #624
bwaslo is offline bwaslo  United States
diyAudio Member
 
bwaslo's Avatar
 
Join Date: May 2006
Location: Cinciinati, OH
Attached are the FRD files, I converted to 44.1kHz FFT spaced (8k length) and included Hilbert Phase. (or I can IFFT to impulse response if that helps).

Bill

Edit -- I should've loaded the files in first and looked at them.... forgot that Praxis frd export only does frequencies being displayed, so these files are all missing stuff below 500Hz and above 20kHz (though what's there is FFT spaced). I will redo if you need....
Attached Files
File Type: zip Horizontals SEOS15.zip (359.8 KB, 42 views)
File Type: zip Verticals SEOS15.zip (361.6 KB, 14 views)

Last edited by bwaslo; 19th June 2011 at 11:57 PM.
  Reply With Quote
Old 20th June 2011, 02:31 PM   #625
doug20 is offline doug20  United States
diyAudio Member
 
Join Date: Mar 2009
bwalso, could you post the impulse data for the SEOS-15?

Nevermind, I see you posted that you didnt save the data.

Last edited by doug20; 20th June 2011 at 02:34 PM.
  Reply With Quote
Old 20th June 2011, 02:52 PM   #626
bwaslo is offline bwaslo  United States
diyAudio Member
 
bwaslo's Avatar
 
Join Date: May 2006
Location: Cinciinati, OH
Doug, I can post recalculated IR if that helps (IFFT of hilbertized frd).
  Reply With Quote
Old 20th June 2011, 04:44 PM   #627
jzagaja is offline jzagaja  Poland
diyAudio Member
 
Join Date: Jun 2004
Location: Szczecin
Send a message via Skype™ to jzagaja
Foam_os12.zip- OS 12" waveguide Holmimpulse data from Mabat letter f with foam and w without foam:


SEOS data - Seos_bms4550.rar
__________________
Visit us at http://www.horns.pl/
The SEOS™ Project http://www.avsforum.com/t/1291022/he...-rallying-here
  Reply With Quote
Old 20th June 2011, 06:19 PM   #628
jzagaja is offline jzagaja  Poland
diyAudio Member
 
Join Date: Jun 2004
Location: Szczecin
Send a message via Skype™ to jzagaja
SEOS-18, black Iwata-300 and white EJMLC-300 to be installed on Universe. Measurements in a couple of days.
Attached Images
File Type: jpg IMG_4086 copy.jpg (139.9 KB, 515 views)
__________________
Visit us at http://www.horns.pl/
The SEOS™ Project http://www.avsforum.com/t/1291022/he...-rallying-here
  Reply With Quote
Old 20th June 2011, 06:21 PM   #629
doug20 is offline doug20  United States
diyAudio Member
 
Join Date: Mar 2009
damn, that IWATA-300 is cool looking. I should have ordered mine in black
  Reply With Quote
Old 20th June 2011, 06:24 PM   #630
jzagaja is offline jzagaja  Poland
diyAudio Member
 
Join Date: Jun 2004
Location: Szczecin
Send a message via Skype™ to jzagaja
Black Iwata with indian apple or modified veneers below. 750Ti doesn't require HF boost.
Attached Images
File Type: jpg 1657374578.jpg (56.5 KB, 510 views)
File Type: jpg ex-display-2.jpg (184.9 KB, 499 views)
__________________
Visit us at http://www.horns.pl/
The SEOS™ Project http://www.avsforum.com/t/1291022/he...-rallying-here
  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
smith horns and using compression horns for a Karlson party speaker project bikehorn Multi-Way 14 30th January 2013 05:20 PM
Horns inside of horns open foe discussion oilcanracer Multi-Way 3 15th February 2010 03:42 AM
Compression drivers in horns or waveguides 454Casull Multi-Way 6 1st December 2008 12:41 PM
Phase plug necessity in horns/waveguides 454Casull Multi-Way 3 18th September 2005 07:36 PM
Horns: Vibrations and resonances in metal horns Rocky Multi-Way 10 28th July 2004 01:38 AM


New To Site? Need Help?

All times are GMT. The time now is 08:08 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