Go Back   Home > Forums > >

Multi-Way Conventional loudspeakers with crossovers

1.4" or 2" throat large constant directivity horns you can actually buy!
1.4" or 2" throat large constant directivity horns you can actually buy!
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
Old 28th May 2019, 06:31 PM   #401
norman bates is online now norman bates  United States
diyAudio Member
 
norman bates's Avatar
 
Join Date: Nov 2003
Location: iowa
Yes, the mouth roundover makes a big difference.

With foam around mouth of 2384, it didn't change hugely (even less horizontal sides) compared to my ev hr90 horn.
Attached Images
File Type: jpg ev-hr-90-horn_1_19591ef671c846ad617bb49341f93f75.jpg (31.2 KB, 584 views)
File Type: jpg nzO2CpB.jpg (983.3 KB, 564 views)
  Reply With Quote
Old 28th May 2019, 07:19 PM   #402
jzagaja is offline jzagaja  Poland
diyAudio Member
 
Join Date: Jun 2004
Location: Szczecin
1.4" or 2" throat large constant directivity horns you can actually buy!
Large termination like in K402. Do you remember Gorge Soong work?
Attached Images
File Type: gif g2.gif (49.0 KB, 565 views)
File Type: gif g1.gif (3.3 KB, 544 views)
__________________
email me jzagaja at gmail
  Reply With Quote
Old 29th May 2019, 10:19 AM   #403
NiToNi is offline NiToNi  United Kingdom
diyAudio Member
 
Join Date: Oct 2004
Jacek,

Is your 3D printer churning away on Marcel's latest WG as we speak...?
  Reply With Quote
Old 29th May 2019, 10:37 AM   #404
chebum is offline chebum  Poland
diyAudio Member
 
Join Date: Apr 2018
Location: Warsaw
Quote:
Originally Posted by gedlee View Post
You can't really, that's why I use the 15". The 8" will always be wider than the waveguide unless you cross very high up, which is not ideal as the polar errors grow as the frequency goes up. Sorry, but 15" really is the better choice - lower crossover, less lobing, better match.
Midwoofer in open-baffle or cardiod will match the directivity lower at 700 or 800Hz.
  Reply With Quote
Old 29th May 2019, 12:01 PM   #405
jzagaja is offline jzagaja  Poland
diyAudio Member
 
Join Date: Jun 2004
Location: Szczecin
1.4" or 2" throat large constant directivity horns you can actually buy!
Quote:
Originally Posted by InOtIn View Post
Jacek,

Is your 3D printer churning away on Marcel's latest WG as we speak...?
It's too small (Zortrax M200) :-) I've sent to test print on professional printer.

But I printed 12" wg for AMT with back chamber based on Marcel's work. Will be tested by friend with custom Beyma 12".
__________________
email me jzagaja at gmail
  Reply With Quote
Old 29th May 2019, 12:34 PM   #406
jzagaja is offline jzagaja  Poland
diyAudio Member
 
Join Date: Jun 2004
Location: Szczecin
1.4" or 2" throat large constant directivity horns you can actually buy!
Quote:
Originally Posted by chebum View Post
Midwoofer in open-baffle or cardiod will match the directivity lower at 700 or 800Hz.
I was always interested to try baffle 0,6m wide 1 meter tall with waveguide that has comp driver with open back to another waveguide and rest also dipole.

Anyone?
__________________
email me jzagaja at gmail
  Reply With Quote
Old 29th May 2019, 01:36 PM   #407
badman is offline badman  United States
diyAudio Member
 
badman's Avatar
 
Join Date: Sep 2003
Location: Ashland, MA
Quote:
Originally Posted by jzagaja View Post
I was always interested to try baffle 0,6m wide 1 meter tall with waveguide that has comp driver with open back to another waveguide and rest also dipole.

Anyone?
The asymmetry of a compression driver would mean you need to have a very different rear-facing design, and the design and assembly complexity would be astronomical. Better to just use a second driver/waveguide combo in my opinion.
__________________
"The dawn of Bose created the "Man Cave" and reduced testoterone levels worldwide by 18.5 per cent" Peteleoni
  Reply With Quote
Old 29th May 2019, 02:58 PM   #408
gedlee is offline gedlee  United States
diyAudio Member
 
gedlee's Avatar
 
Join Date: Dec 2004
Location: Novi, Michigan
Quote:
Originally Posted by chebum View Post
Midwoofer in open-baffle or cardiod will match the directivity lower at 700 or 800Hz.
I think that people over estimate the effect of an open baffle on a drivers directivity. Once the driver begins to narrow its coverage, the baffle no longer has a significant effect. This means that the driver has the same beam-width at crossover whether its open baffle or not (unless the driver is very small, in which case it won't work very well open baffle.)
__________________
Earl Geddes Gedlee Website
  Reply With Quote
Old 29th May 2019, 05:31 PM   #409
chebum is offline chebum  Poland
diyAudio Member
 
Join Date: Apr 2018
Location: Warsaw
Quote:
Originally Posted by gedlee View Post
I think that people over estimate the effect of an open baffle on a drivers directivity. Once the driver begins to narrow its coverage, the baffle no longer has a significant effect. This means that the driver has the same beam-width at crossover whether its open baffle or not (unless the driver is very small, in which case it won't work very well open baffle.)
I thought about lowering the crossover point. You said it's better to cross at 1000-1100 region to better match directivity. My idea was the OB will maintain narrow directivity down to lowest frequencies and thus will make 700Hz crossover possible.
  Reply With Quote
Old 29th May 2019, 06:22 PM   #410
badman is offline badman  United States
diyAudio Member
 
badman's Avatar
 
Join Date: Sep 2003
Location: Ashland, MA
Quote:
Originally Posted by chebum View Post
I thought about lowering the crossover point. You said it's better to cross at 1000-1100 region to better match directivity. My idea was the OB will maintain narrow directivity down to lowest frequencies and thus will make 700Hz crossover possible.
I think where it can get more challenging is that the driver directivity from dipole/cardioid is effective where the driver's operating in more of an omnidirectional mode. As the driver naturally starts tapering in directivity, it no longer cancels to the sides, and depending upon the details, you may get a dispersion flare from where the cancellation is taking place, to where the driver's natural directivity keeps it narrow.

I think it's doable just with lots of effort and impractical for most systems. Even though Geddes style solutions are a little more complex than plug 'n play, adding dipole EQ and all the extra stuff that goes along with a dipole/cardioid solution adds a lot more complexity and equipment.

Almost anything is possible with enough effort, a big enough room, and a big enough budget, but there's always an economic decision to be made about whether all that adds something meaningful enough to pursue.
__________________
"The dawn of Bose created the "Man Cave" and reduced testoterone levels worldwide by 18.5 per cent" Peteleoni
  Reply With Quote

Reply


1.4" or 2" throat large constant directivity horns you can actually buy!Hide this!Advertise here!
Thread Tools

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
Custom dual throat horns for two inch throat drivers Mike Caldwell Swap Meet 2 12th February 2017 04:28 AM
which fullrange might work as well as LE5A on a 250Hz tractrix w. 2.5" x 2.5" throat? freddi Full Range 19 4th December 2015 07:25 PM
3 large EV fiberglass horns for 12" woofer cjh Swap Meet 0 28th October 2014 07:00 AM
EH 500 Radial Horns, 2" Throat, 500 Hz macka Swap Meet 0 13th June 2014 08:37 AM


New To Site? Need Help?

All times are GMT. The time now is 03:58 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki