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

Multi-Way Conventional loudspeakers with crossovers

Pseudo-coaxial with narrow directivity (and Horbach-Keele filters)
Pseudo-coaxial with narrow directivity (and Horbach-Keele filters)
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 29th July 2018, 09:55 PM   #31
bwaslo is offline bwaslo  United States
Old guy with soldering iron
diyAudio Member
 
bwaslo's Avatar
 
Join Date: May 2006
Location: Portland, Oregon!
Pseudo-coaxial with narrow directivity (and Horbach-Keele filters)
__________________
[W9MJE] Horn spreadsheet SynergyCalc/; SmallSyns SmallSyns;
Crossover design Xsim; Depot diffusor super-easy diffusors
  Reply With Quote
Old 2nd August 2018, 12:32 AM   #32
Brinkman is offline Brinkman  United States
diyAudio Member
 
Join Date: Aug 2007
Location: Oakland, CA
Wow. Nicely done!
  Reply With Quote
Old 9th August 2018, 09:16 PM   #33
Patrick Bateman is offline Patrick Bateman  United States
diyAudio Member
 
Patrick Bateman's Avatar
 
Join Date: Oct 2006
Location: San Diego
Click the image to open in full size.

So it looks like you're using DSP delay on the side drivers to extend the beamwidth control down to 500Hz? (I'm too lazy to translate the PDF yet)
  Reply With Quote
Old 10th August 2018, 06:23 AM   #34
FoLLgoTT is offline FoLLgoTT  Germany
diyAudio Member
 
FoLLgoTT's Avatar
 
Join Date: Oct 2006
Location: Hannover, Germany
Quote:
Originally Posted by Patrick Bateman View Post
So it looks like you're using DSP delay on the side drivers to extend the beamwidth control down to 500Hz? (I'm too lazy to translate the PDF yet)
Yes. But it the side woofers are not inverted or delayed like in a cardioid system. Instead the other drivers are delayed so that the side woofers interfere constructive and create directivity only because of their distance to each other.

Of course it has its limitations. Under 500 Hz the speaker radiates uniform in all directions. But the advantage is that there is no loss in maximum SPL in the lower frfequencies compared to a cardioid.
  Reply With Quote
Old 15th August 2018, 08:08 AM   #35
Patrick Bateman is offline Patrick Bateman  United States
diyAudio Member
 
Patrick Bateman's Avatar
 
Join Date: Oct 2006
Location: San Diego
Some random observations about this speaker here : Combating Pattern Flip
  Reply With Quote
Old 7th January 2019, 10:52 AM   #36
FoLLgoTT is offline FoLLgoTT  Germany
diyAudio Member
 
FoLLgoTT's Avatar
 
Join Date: Oct 2006
Location: Hannover, Germany
The new subwoofer system is ready to play. I built four vented subwoofers which are configured in a DBA configuration. The room is not perfect for a DBA, but it works better than expected. So decay is greatly reduced in the bass region.

I use Scan Speak 30W/4558T00. The port is tuned at 26 Hz. I use linear phase FIR filters to cross them at 80 Hz with 96 dB/Okt. And the filter equalizes the phase of the bandpass. So the whole system is linear phase.

Pseudo-coaxial with narrow directivity (and Horbach-Keele filters)-_mg_7686_klein-jpg

Pseudo-coaxial with narrow directivity (and Horbach-Keele filters)-_mg_7691_klein-jpg

The electrical power comes from two Behringer A800. Each driver has its own channel.

Pseudo-coaxial with narrow directivity (and Horbach-Keele filters)-_mg_7943_klein-jpg

For my living room (26 mē) the maximum SPL of the system is high enough. You never get the feeling that you cranked up the volume too high.
Attached Images
File Type: jpg _MG_7686_klein.jpg (204.6 KB, 287 views)
File Type: jpg _MG_7691_klein.jpg (145.8 KB, 159 views)
File Type: jpg _MG_7943_klein.jpg (168.8 KB, 156 views)

Last edited by FoLLgoTT; 7th January 2019 at 10:57 AM.
  Reply With Quote
Old 7th January 2019, 07:41 PM   #37
Zvu is offline Zvu  Serbia
diyAudio Member
 
Zvu's Avatar
 
Join Date: Jan 2009
Location: Belgrade
Bravo
  Reply With Quote
Old 7th January 2019, 08:02 PM   #38
Omholt is offline Omholt  Norway
diyAudio Member
 
Omholt's Avatar
 
Join Date: Jun 2009
Quote:
Originally Posted by FoLLgoTT View Post
I use linear phase FIR filters to cross them at 80 Hz with 96 dB/Okt. And the filter equalizes the phase of the bandpass. So the whole system is linear phase.
Do you notice any difference at all with the FIR filter compared to something i.e. a 4th order LR IIR filter?

Last edited by Omholt; 7th January 2019 at 08:10 PM.
  Reply With Quote

Reply


Pseudo-coaxial with narrow directivity (and Horbach-Keele filters)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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Alpair 7 used for Keele CBT Array HiroPro Full Range 9 11th March 2016 12:25 PM
Narrow room - need narrow speakers for surround sound duties... Gary Lightfoot Full Range 30 27th October 2014 11:32 PM
Calculation of Horbach-Keele FIR filters usul27 PC Based 1 4th October 2011 08:26 PM
Don Keele's presentation at MWAF dantheman Multi-Way 2 24th July 2010 02:18 PM
Revamping Keele W-Bins mobyd Multi-Way 3 5th October 2006 09:35 PM


New To Site? Need Help?

All times are GMT. The time now is 09:35 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki