Full range line array in a tube - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

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 21st July 2010, 08:35 AM   #1
Paper mache horn fabricator
diyAudio Member
 
carpenter's Avatar
 
Join Date: Mar 2002
Location: Oregon City, Oregon
Default Full range line array in a tube

I'm experimenting with something new, affordable, and best of all--sounds good.

I purchased a pair of 8" diameter x 48" long cardboard tubes from Home Depot (they're used for forming up concrete piers) and stuffed them with twelve 3" M&K drivers. I ported the array (by standing the tube on some quart sized paint cans ) to increase bass extension and basically wired it up to run as a 4 ohm load.

I'm very impressed! The cardboard is only 1/8" so I expected the possibility of vibration and resonance, but guess what? Due the the fact that the tube is round, there's strength and very little reflection to cause standing waves. The sound is pure--almost uncanny.

I spent $3.75 apiece on the M&K drivers and the tubes cost $7.00 each. There's no crossover, so the overall expense for this project is basically peanuts. There's no way I expected this thing to sound so good.

Of course, my little class A amp has something to do with the sound, but an amp can't do much without decent speakers.

Just had to share...
Attached Images
File Type: jpg line array Liora's birthday.jpg (98.6 KB, 714 views)
__________________
I enjoy audio so much that I constructed a web site. I share my ideas at: www.inlowsound.com
  Reply With Quote
Old 21st July 2010, 08:56 AM   #2
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
Well done. You can put some caps across the lower drivers to obtain a gradual rising response of the highs from the upper ones .
  Reply With Quote
Old 21st July 2010, 09:07 AM   #3
Paper mache horn fabricator
diyAudio Member
 
carpenter's Avatar
 
Join Date: Mar 2002
Location: Oregon City, Oregon
Quote:
Originally Posted by picowallspeaker View Post
Well done. You can put some caps across the lower drivers to obtain a gradual rising response of the highs from the upper ones .
Could you offer more details? Sounds interesting.
__________________
I enjoy audio so much that I constructed a web site. I share my ideas at: www.inlowsound.com
  Reply With Quote
Old 21st July 2010, 09:31 AM   #4
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
Hi Carpenter . It just acts as a series crossover . The speakers placed at ear height will reproduce full band ,the lower ones only bass . Depends how you did the serial parallel connection between them .For example you've got 3 stacks of paralleled drivers ,the 2 lower ones will have 1 cap each (for example :100 uF ;50 uF ).
See also Parts Express: Project Showcase
(just to see the EQ needed )
  Reply With Quote
Old 21st July 2010, 01:16 PM   #5
diyAudio Member
 
Join Date: Jun 2009
Very cool!

Have you given any thought to stuffing the tubes?
  Reply With Quote
Old 21st July 2010, 05:09 PM   #6
Paper mache horn fabricator
diyAudio Member
 
carpenter's Avatar
 
Join Date: Mar 2002
Location: Oregon City, Oregon
Quote:
Originally Posted by Trapshooter View Post
Very cool!

Have you given any thought to stuffing the tubes?
I have thought of stuffing, but the sound is resonate free, so I can't see any reason for the additional dampening.

I'm guessing the little M&K drivers (which are really tiny and have small motors) have a fairly high Qts. They feel/sound right at home with the volume I gave them, and also may account for the extended bass response in the relatively large tube. These most likely are not bass drivers, so it's pretty cool to be getting full spectrum.

The most important thing to me is keeping the delicate nature of sound that emanates from the cone of a small speaker. Large cones sound just a tad clunky in comparison. I'm getting plenty of texture, nuance, etc that a large driver masks.

There's a line array drawing on my web site if anyone is interested--just click on my name above the avatar.
__________________
I enjoy audio so much that I constructed a web site. I share my ideas at: www.inlowsound.com

Last edited by carpenter; 21st July 2010 at 05:12 PM.
  Reply With Quote
Old 21st July 2010, 05:14 PM   #7
Paper mache horn fabricator
diyAudio Member
 
carpenter's Avatar
 
Join Date: Mar 2002
Location: Oregon City, Oregon
Quote:
Originally Posted by picowallspeaker View Post
Hi Carpenter . It just acts as a series crossover . The speakers placed at ear height will reproduce full band ,the lower ones only bass . Depends how you did the serial parallel connection between them .For example you've got 3 stacks of paralleled drivers ,the 2 lower ones will have 1 cap each (for example :100 uF ;50 uF ).
See also Parts Express: Project Showcase
(just to see the EQ needed )
Gotcha. I was over analyzing your original remark--now I understand completely. Thanks for the advice.
__________________
I enjoy audio so much that I constructed a web site. I share my ideas at: www.inlowsound.com
  Reply With Quote
Old 22nd July 2010, 12:41 AM   #8
jrenkin is offline jrenkin  United States
diyAudio Member
 
Join Date: Nov 2007
Location: Denver, Colorado
Awesome! I have though of, but never done, a speaker using these tubes. I too thought there would be vibration, so my imaginings were with two sono tubes, 8" and 10", concentric with sand or concrete between them. Just a thought.
  Reply With Quote
Old 22nd July 2010, 01:37 AM   #9
Paper mache horn fabricator
diyAudio Member
 
carpenter's Avatar
 
Join Date: Mar 2002
Location: Oregon City, Oregon
Quote:
Originally Posted by jrenkin View Post
Awesome! I have though of, but never done, a speaker using these tubes. I too thought there would be vibration, so my imaginings were with two sono tubes, 8" and 10", concentric with sand or concrete between them. Just a thought.
That's a terrific idea, jrenkin!

I decided to allow the enclosure to do whatever it wanted as an experiment in minimal design. I've read of speaker enclosure that are designed to resonate in order to enhance the speaker. Seems, in this case, it hasn't done any harm.

I'll have to give your idea a whirl.
__________________
I enjoy audio so much that I constructed a web site. I share my ideas at: www.inlowsound.com
  Reply With Quote
Old 22nd July 2010, 01:48 AM   #10
jrenkin is offline jrenkin  United States
diyAudio Member
 
Join Date: Nov 2007
Location: Denver, Colorado
Let me know how it comes out. It certainly will make it more complicated....
  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
Full Range Line Array Thoughts? mayhem13 Full Range 26 3rd October 2010 12:46 PM
Full range line array inrank Full Range 39 20th January 2009 12:27 PM
Jordan JX6 full-range line array bcherry Full Range 74 3rd April 2007 07:53 AM
Full-range line array? mazeroth Full Range 20 1st November 2004 03:47 PM
line array with full range drivers? leadbelly Multi-Way 9 25th January 2003 04:48 PM


New To Site? Need Help?

All times are GMT. The time now is 01:07 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