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want to do an OB design, first one.
want to do an OB design, first one.
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Old 21st July 2021, 10:55 PM   #1
sv572 is offline sv572  United States
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Default want to do an OB design, first one.

Hello gentlemen. I would like some input on an ob system. my budget is around
$500 for drivers and crossover parts. would like a mtm design suggestions. $$ is flexible. I would also like to know if anyone has used the 10 inch dipole from

speaker addict?

ok lets hear it
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Old 22nd July 2021, 03:47 AM   #2
Pano is offline Pano  United States
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want to do an OB design, first one.
If you are planning an first OB on a budget, I suggest you have a look at this thread.
Fast, fun, Inexpensive OB project

Some of the recent posts will give you an idea of the sound. In the post post there are links to the current versions.
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Old 22nd July 2021, 06:08 PM   #3
sv572 is offline sv572  United States
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Red face first ob speaker build

Thank you for responding. I studied that speaker thread yesterday. I'm looking for
something a little more than that one. My budget is more flexible than that i guess. My past designs and builds have been a few three ways, some bookshelves, but mostly MTM, some floor standing, some with separate subs.
I'm really interested in a OB MTM with a soft or silk dome tweeter or maybe a
planar. Any suggestions, advice, input or experiences are welcomed. Good or bad.
Thank you Sir,
patiently awaiting


benb
sv572
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Old 22nd July 2021, 06:30 PM   #4
classicalfan is offline classicalfan  United States
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Here you go. Paul Carmody's Sunflower. MTM OB hybrid.

Paul Carmody's DIY Speaker Pages - Dipole and Open-Baffle
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Old 22nd July 2021, 09:02 PM   #5
Pano is offline Pano  United States
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want to do an OB design, first one.
You have mentioned MTM and a budget, but what are your other goals? SPL? Efficiency? Baffle size? Woofer size? Bass extension?
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Old 22nd July 2021, 10:56 PM   #6
classicalfan is offline classicalfan  United States
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I agree with Pano. You are attempting to define a solution without first defining the problem.

An MTM OB may or may not be what you want. It depends on what your goals are.
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Old 23rd July 2021, 04:10 AM   #7
Pano is offline Pano  United States
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want to do an OB design, first one.
When I think OB I don't immediately think 10" woofer, but with two per side you'd have a little more displacement than a singe 12". Somewhere between a 12 and a 15. Not bad.

I don't know the dipole 10" the OP mentions, but maybe it's their IB woofer? It has a very high Qts, low Fs and good x-max. Very inefficient, but maybe that very high Q would help in the bottom end. At least a 10" won't be too hard to cross over to a silk dome tweeter. A Planar could be fun, especially if you can take the back off.
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Old 23rd July 2021, 05:26 AM   #8
picowallspeaker is offline picowallspeaker  Italy
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MTM with a 10" ?
Crossover for 10” mtm
If parts don't fit, i.e. a pro midwoofer won't take abuse like a long excursion woofer, some changes are on the way. Essentially, I would follow (like at the beginning in of Fast, fun OB thread) the dome tweeter idea...since it's the component less stressed. And then apply the EQ (bi-quad, +10 dB @ 34 Hz as example) and... voilà!
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Old 23rd July 2021, 11:32 AM   #9
von Ah is offline von Ah  United States
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want to do an OB design, first one.
Two dome tweeters (front-back) would make the completed speaker dipole.

I like Pano’s idea of using a planar mid-tweet. The slim 8 GRS planar seems to be well liked, inexpensive, and dipole.

GRS PT6816-8 8" Planar Slim Tweeter 8 Ohm

New planar drivers at Parts Express

Last edited by von Ah; 23rd July 2021 at 11:48 AM.
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