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#1 |
Paper mache horn fabricator
diyAudio Member
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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 ![]() 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...
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I enjoy audio so much that I constructed a web site. I share my ideas at: www.inlowsound.com |
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#2 |
diyAudio Member
Join Date: Apr 2007
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Well done. You can put some caps across the lower drivers to obtain a gradual rising response of the highs from the upper ones .
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#3 |
Paper mache horn fabricator
diyAudio Member
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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 |
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#4 |
diyAudio Member
Join Date: Apr 2007
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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 ) |
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#5 |
diyAudio Member
Join Date: Jun 2009
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Very cool!
Have you given any thought to stuffing the tubes? |
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#6 | |
Paper mache horn fabricator
diyAudio Member
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Quote:
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.
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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 06:12 PM. |
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#7 | |
Paper mache horn fabricator
diyAudio Member
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Quote:
__________________
I enjoy audio so much that I constructed a web site. I share my ideas at: www.inlowsound.com |
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#8 |
diyAudio Member
Join Date: Nov 2007
Location: Denver, Colorado
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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.
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#9 | |
Paper mache horn fabricator
diyAudio Member
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Quote:
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 |
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#10 |
diyAudio Member
Join Date: Nov 2007
Location: Denver, Colorado
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Let me know how it comes out. It certainly will make it more complicated....
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