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

Suitable midrange cone, for bandpass mid in Unity horn.
Suitable midrange cone, for bandpass mid in Unity horn.
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 27th February 2012, 08:08 AM   #501
paulspencer is offline paulspencer  Australia
diyAudio Member
 
paulspencer's Avatar
 
Join Date: Sep 2003
Location: Melbourne, Australia
I'm now working on S3, which I'm thinking of making 80 x 60. I don't actually need 90 degrees dispersion. A few things happen as you change the coverage pattern. One is that narrowing it makes it harder to mount drivers. Another is that you tend to lose a bit of bottom end extension. Also you tend to make the mouth smaller, resulting in a loss of pattern control at a higher frequency. In S2, horizontally I had a constant beamwidth down to 280 Hz where there was a big mouth and 90 degrees. Vertically, where I had 40 degrees, pattern control is lost much sooner. The result is pattern flip. The narrow coverage only occurs up higher, and in the midrange the pattern starts to get more broad again.
  Reply With Quote
Old 5th March 2012, 08:39 PM   #502
bwaslo is offline bwaslo  United States
Old guy with soldering iron
diyAudio Member
 
bwaslo's Avatar
 
Join Date: May 2006
Location: Portland, Oregon!
Suitable midrange cone, for bandpass mid in Unity horn.
Looking around for some cheap midranges to play with, I ran into these:
2" Paper Cone Midrange Tweeter 4 Ohm 289-127

They are open back, but the resonance is high and the compliance is stiff. Even with a big back chamber they seem to work pretty well with HornResponse (the volume behind does not affect it much). Not the most efficient in the world, but with 2" diameter, it can be pushed nice and high in frequency. Assuming the given parameters are close, of course. The price is very cheap for experimenting, looking at 4 or 6 in a synergy horn with a high upper crossover to a small compression driver.

I don't know how many they have, will have to stop up and ask.
  Reply With Quote
Old 5th March 2012, 11:20 PM   #503
paulspencer is offline paulspencer  Australia
diyAudio Member
 
paulspencer's Avatar
 
Join Date: Sep 2003
Location: Melbourne, Australia
My sims are suggesting good top end extension is possible with the Celestion 4". Here's an example modelled in both Hornresp and Akabak:

Click the image to open in full size.

Green is Hornresp

Which one is more accurate? Well here's both against a measured example where I put the Celestion 4" on S1, just a single sample driver and then I modelled it:

Click the image to open in full size.

Here Hornresp is red

I have found that one can get more out of band output than expected from Hornresp - Akabak is better at predicting that. However, down to the first peak, I've had better results with Hornresp, also with the bottom end extension. Perhaps that changes when one learns to drive Akabak properly, as I've just exported the script from Hornresp. Yes - cheating!
  Reply With Quote
Old 6th March 2012, 01:33 AM   #504
winslow is offline winslow  United States
diyAudio Member
 
Join Date: Aug 2005
Paul are you doing the ports at 1/4 or 1/2 wavelength distance from the compression driver?
  Reply With Quote
Old 6th March 2012, 01:40 AM   #505
paulspencer is offline paulspencer  Australia
diyAudio Member
 
paulspencer's Avatar
 
Join Date: Sep 2003
Location: Melbourne, Australia
That is 1/4 @ 1.5k ie 57mm
  Reply With Quote
Old 6th March 2012, 02:15 PM   #506
bwaslo is offline bwaslo  United States
Old guy with soldering iron
diyAudio Member
 
bwaslo's Avatar
 
Join Date: May 2006
Location: Portland, Oregon!
Suitable midrange cone, for bandpass mid in Unity horn.
Here is a HornResponse sim using 4 of these 2" midranges on a 90x60 conical 450Hz unity type waveguide. I've also seen these drivers at Marlin P Jones, not bad for a buck and a half each.

Click the image to open in full size. Click the image to open in full size.

Quote:
Originally Posted by bwaslo View Post
Looking around for some cheap midranges to play with, I ran into these:
2" Paper Cone Midrange Tweeter 4 Ohm 289-127

They are open back, but the resonance is high and the compliance is stiff. Even with a big back chamber they seem to work pretty well with HornResponse (the volume behind does not affect it much). Not the most efficient in the world, but with 2" diameter, it can be pushed nice and high in frequency. Assuming the given parameters are close, of course. The price is very cheap for experimenting, looking at 4 or 6 in a synergy horn with a high upper crossover to a small compression driver.

I don't know how many they have, will have to stop up and ask.

Last edited by bwaslo; 6th March 2012 at 02:20 PM.
  Reply With Quote
Old 6th March 2012, 04:22 PM   #507
ErnieM is online now ErnieM  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Fresno, CA
I bought a box of those for some line arrays...this looks more interesting. Nice little driver. Also have a pair of de250's. I think I have a change of plans now.
  Reply With Quote
Old 7th March 2012, 08:12 PM   #508
bwaslo is offline bwaslo  United States
Old guy with soldering iron
diyAudio Member
 
bwaslo's Avatar
 
Join Date: May 2006
Location: Portland, Oregon!
Suitable midrange cone, for bandpass mid in Unity horn.
Default Got some of the little mids...

Went up to Parts Express today and picked up 9 of these little guys. I measured the T/S parameters, a little off from what they were quoted, but no less usable. Here are shots of the T/S, new HornResp values, and simulated response curve for a 4x4 arrangement:
Click the image to open in full size.Click the image to open in full size.
Click the image to open in full size.

They have on the order of 300 of these in stock.

These won't be easy to seal the backs on because the terminals are so close to the outer edge, but a lot of volume on the back doesn't have much if any effect (just stuff the back volume with damping). Could just put the whole synergy horn in a box for the back waves from these drivers.

I'm also getting some of the Celestion 4" mids that Paul Spenser recommends. These 2" ones though might be a good match for use with a CD that cuts in at about 2kHz, I'm hoping.
  Reply With Quote
Old 8th March 2012, 08:05 PM   #509
Patrick Bateman is offline Patrick Bateman  United States
diyAudio Member
 
Patrick Bateman's Avatar
 
Join Date: Oct 2006
Location: San Diego
Quote:
Originally Posted by ErnieM View Post
I bought a box of those for some line arrays...this looks more interesting. Nice little driver. Also have a pair of de250's. I think I have a change of plans now.
Actually these horns *are* an array. In a lot of ways, they're similar to WMTMW array, but folded around a horn.
  Reply With Quote
Old 10th March 2012, 08:10 PM   #510
grec13 is offline grec13  United States
diyAudio Member
 
Join Date: Apr 2007
Location: Honolulu
Default Ribbon for Unity?

Hi guys.
Is it possible to use ribbon instead of compression driver in Unity horn?
__________________
Sergey
  Reply With Quote

Reply


Suitable midrange cone, for bandpass mid in Unity horn.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
Bandpass Woofer/Midrange? m@ Multi-Way 5 25th March 2006 02:10 AM
looking for 6.5inch woofers suitable for a 30 - 35Hz horn... and a small horn too :P SkinnyBoy Multi-Way 24 13th February 2004 05:06 AM


New To Site? Need Help?

All times are GMT. The time now is 09:32 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki