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 14th October 2010, 07:22 PM   #121
JLH is offline JLH  United States
diyAudio Member
 
JLH's Avatar
 
Join Date: Apr 2005
Location: Indianapolis, IN
Once I've got this design nailed down better I will offer up the details and probably a group buy for those that are interested. It seems I make little bit of progress everyday. I still have a few hitchs to iron out. I'll let you know when the time comes. BTW, the RDC3T's high end is only limited by how close you can place them to the throat. Several of my models have had it playing as high as 2KHz.

Rgs, JLH
__________________
Ah, how beautifully the orchestra sounds before a rain! In a dry sunny day there is no way for the instruments to sound this way!
  Reply With Quote
Old 15th October 2010, 05:24 AM   #122
Brett is offline Brett
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
John, I'd be interested in 4 drivers at least, maybe more depending on what they end up costing. I want a centre for between my Lambda Unitys at least.

What CD are you planning on using or is that fairly flexible?

Last edited by Brett; 15th October 2010 at 05:27 AM.
  Reply With Quote
Old 15th October 2010, 10:37 AM   #123
JLH is offline JLH  United States
diyAudio Member
 
JLH's Avatar
 
Join Date: Apr 2005
Location: Indianapolis, IN
What I'm designing for is something around 40 X 60, give or take a few degrees. I arrived at this by looking at several room sizes and what might be the most useful for everyone. The speaker placement would 2 feet out from the corners and about 30 inches high. By toeing the speakers you should be able to get all the horizontal coverage you need with 60 degrees. The 40 degree should help prevent ceiling and floor bounce. We don't want the room messing with all our hard work. When I have it the way I want it, I'll start a new thread as to not highjack this one.

Rgs, JLH
__________________
Ah, how beautifully the orchestra sounds before a rain! In a dry sunny day there is no way for the instruments to sound this way!
  Reply With Quote
Old 15th October 2010, 05:15 PM   #124
Brett is offline Brett
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
Quote:
Originally Posted by JLH View Post
When I have it the way I want it, I'll start a new thread as to not highjack this one.
Sounds good and I'll look forward to reading about it.

As some of use (like me) aren't all that regular viewers here any more could you please also post a 'I have a new thread here....' post in this thread so I might not miss it for ages.
  Reply With Quote
Old 18th October 2010, 06:53 PM   #125
SunRa is offline SunRa  Romania
diyAudio Member
 
Join Date: Aug 2004
Location: Romania
I really look forward to seeing your conclusion JLH. The more I think about the ultimate speaker, the more the Unity concept comes as a favorite topology.

There is something very appealing about this configuration and I come back to it again and again even if I am in the "low diffraction", "excellent time domain behavior" camp. I find using 4 mids firing unaligned in a horn through unoptimized ports (essentially holes), strongly against these principles.

And still, the design intrigues me and it has priority on my design choices, can't tell why. It would be even more interested to see a nailed down design from you.
  Reply With Quote
Old 18th October 2010, 07:14 PM   #126
jeno is offline jeno  Norway
diyAudio Member
 
Join Date: Apr 2006
Location: Way up north
Quote:
Originally Posted by SunRa View Post
the Unity concept comes as a favorite topology.

There is something very appealing about this configuration and I come back to it again and again even if I am in the "low diffraction", "excellent time domain behavior" camp. I find using 4 mids firing unaligned in a horn through unoptimized ports (essentially holes), strongly against these principles.
This design may have some diffraction issues, but I think the "time domain behaviour" is very good, unless there is something I'm missing.
  Reply With Quote
Old 20th October 2010, 07:31 PM   #127
SunRa is offline SunRa  Romania
diyAudio Member
 
Join Date: Aug 2004
Location: Romania
Hello jeno,

I actually borrowed the term from over the beyond the ariel thread. By time domain behavior I don't mean time alignment effects (point source, etc) but effects such as diffraction having an effect not on frequency but in the "time domain" . For example all sorts of reflections arriving later than the main signal. Or diffractions also visible in this "time domain".
  Reply With Quote
Old 21st November 2010, 10:09 PM   #128
SunRa is offline SunRa  Romania
diyAudio Member
 
Join Date: Aug 2004
Location: Romania
Hello JLH,


Any news on your work? It's been a while since you're last update!

All the best!
  Reply With Quote
Old 22nd November 2010, 05:32 PM   #129
JLH is offline JLH  United States
diyAudio Member
 
JLH's Avatar
 
Join Date: Apr 2005
Location: Indianapolis, IN
I've been too busy with my real work. I ran into a problem with getting the higher frequencies from the 3" mids to cutoff as to not mess with the compression driver output. I have ideas on how to fix it, but have not had time to simulate it.
__________________
Ah, how beautifully the orchestra sounds before a rain! In a dry sunny day there is no way for the instruments to sound this way!
  Reply With Quote
Old 17th December 2010, 01:06 AM   #130
Patrick Bateman is offline Patrick Bateman  United States
diyAudio Member
 
Patrick Bateman's Avatar
 
Join Date: Oct 2006
Location: San Diego
Someone emailed me, asking if I'd kept any records of the methods which can be used to improve the midranges in a Unity horn.

I don't.

But here's a "braindump" of the things that I would do.

This is based off of building half a dozen "clones." (Not sure if "clone" is the appropriate word, since I was trying to miniaturize the design.)
  • First, get the patent for the Synergy Horn. There are a number of improvements in there. The most obvious one is to use a frustrum instead of a cylinder for the holes. The advantage of a frustrum is that it won't screw up the response of your compression driver as much as a cylinder will. The reason is because the cylindrical holes in a unity horn will create blips in the response, based on their geometry. A frustrum suffers from the same problem, but to a MUCH smaller extent, because of the tapered shape. You can model it in Akabak. I'm a fan of just building the damn thing, because it's easy to waste days in Akabak, when simply experimenting with various geometries is fairly easy. (Wood putty helps!)
  • Second, get a woofer with a nice motor. I've whined about this a few times, but I really think you can do better by using a midrange with low distortion. Tangband makes a lot of small woofers that work nicely in a Unity. All of the math you'll need is in this thread. I think that Danley uses prosound midranges because they have the right set of Thiele Small Parameters, they can handle a lot of power, and they're relatively affordable. Danley can't use Tangband because his customers care more about power handling and reliability than they care about distortion. But for a home speaker, the smaller midranges are a better option IMHO.
  • Another HUGE advantage of a smaller midrange is that you can move everything closer together. This makes doing the crossover a heck of a lot easier.
  • And ANOTHER huge advantage of a smaller midrange is that you can get away with smaller entrance holes in the horn. (The size of the entrance holes gets larger as the midrange woofer gets larger. Smaller holes will limit your SPL, but improve frequency response.) In a nutshell, for HiFi, we don't need to make the same compromises that we'd make for a concert venue.
  • The Yorkville Unity uses slots instead of holes. I've tried this, and it works very nicely. It may be an attractive alternative to a frustrum.
  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 11:06 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki