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Old 8th November 2006, 06:47 AM   #1
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Default Any ideas for el-cheapo omni speakers?

A local coffeeshop needs some speakers. They have a small room (about the size of a bedroom) for drinking coffee, in which everyone is sitting every which way.

I was thinking about building some simple omnidirectional speakers as my 2nd speaker project. Although I'm new to DIY audio, I'm a reasonably experienced student metalsmith, and making the curvilinear cone doohickeys for placement over a tweeter (to make it omnidirectional) should be cake.

The question is what I should use for woofers, or more specifically, how I should mount them. I live near Madisound, and the AP100Z0 looks like an interesting option - at under 7$ each, they're certianly inexpensive.

There is a few ways I could do this. A curvilinear cone could be used to re-orient the sound in all directions; however, this would need to be made out of wood on a lathe, and I'm no good at woodworking. Or, I could just use the Linkwitz approach, and EQ the heck out of it.

http://www.linkwitzlab.com/surround_speaker.htm

Any suggestions?
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Old 8th November 2006, 07:59 AM   #2
el`Ol is offline el`Ol  Germany
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Maybe Visaton`s plans for omnidirectional speakers can help you:
http://www.visaton.de/en/bauvorschla...ler/index.html
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Old 8th November 2006, 08:08 AM   #3
el`Ol is offline el`Ol  Germany
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Another suggestion:

The 45-response of this flat diaphragm driver lets me think about mounting four of them on four sides of a speaker coloumn and just use a reflector for the tweeter.
http://www.eighteensound.it/index.as...roduct&pid=243
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Old 8th November 2006, 10:29 AM   #4
Geoff H is offline Geoff H  Australia
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That situation calls for a pair of 8" widerange in the ceiling. Altec 755s except as I, and you, have recently learnt, they're big bucks.

There are plenty of others available. Try looking for quality PA speakers, without the 100v line transformer. I used to use DAI-1CHI DC8-30s for that sort of work. I think they are sold under a different name in the states.

Not much of a project, cutting 2 holes and running some cable. Run a centre line down the length of the room, divide that line into 3, that's where the speakers go. Stereo everywhere.
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Old 8th November 2006, 02:14 PM   #5
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Quote:
Originally posted by el`Ol
Another suggestion:

The 45-response of this flat diaphragm driver lets me think about mounting four of them on four sides of a speaker coloumn and just use a reflector for the tweeter.
http://www.eighteensound.it/index.as...roduct&pid=243

Those things are 80 euros each!

I do, however, like Visaton's omni-speaker page . Quite informative.

I'm thinking that some knockoffs of their Fontanella loudspeakers made with a transmission line of PVC pipe instead of an octogonal cabinet.

http://www.visaton.de/en/bauvorschla...ana/index.html

If I use enough stuffing, I would'nt even need to taper the line.
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