should I ask open baffle questions on exotics or full range? - diyAudio
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Old 12th April 2014, 06:41 PM   #1
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Red face should I ask open baffle questions on exotics or full range?

Am I posting on the right forum ? I have questions re : An open baffle speaker design ? should this be in planers and exotics? or in the full range? Thank you all again for your patience ... I promise to listen very carefully and not repeat myself! sorry for my ignorance but thats why i'm here .THANK you so much .....Scott in sunny Eugene
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Old 12th April 2014, 07:38 PM   #2
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Hi,
properly, you can make any "open baffle design"
like... every driver that has a back radiation and has to be considered or,
give particular attention to the baffle as a contribution to the radiation.
So when considering a woofer which has a back radiation and the wavelenghts
of sound waves to be reproduced you may fix the point when it starts to decay
in level by enlarging or reducing the width of the baffle .
See for example the latest Linkwitz Diy proposal which might seem rather strange, the LX 521.

A fullrange driver in open baffle is undesidered, as it expands its limits
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Old 12th April 2014, 07:54 PM   #3
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So I've seen the "H box" on the bottom of an open baffle . I have a complete wood shop so the baffle is not my hurdle it's the driver choice and x-over that I am totally unable to do . I want a 15" woofer a "full range" and a tweeter on an open baffle and I would like to stress that I can Build anything but I don't want a horn loaded speaker I do Like them alot but I would love a simple big open baffle with a super simple crossover and exact baffle size if larger is better than i am fine with that .thank you
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Old 12th April 2014, 08:46 PM   #4
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A fullrange is too generic. You can choose from 3"-4-5-6-8 " diameter
depending also from the chosen crossover frequency.
Also the tweeter, could be a high efficiency one- though mated with a horn-
since the woofer might meet 95 dB centerband efficiency easily, and since it goes together ( the eff.) with the diameter contribution to SPL, which is the sensitivity expressed in dB per Watt per meter ( measured at centerband ).

The woofer etc etc etc
So, 15 " like Eminence Alpha or something from GRS

Maybe, as they are usually used in OB
but I don't know if the added impedance of the cavity created by half of the H might
need a different driver

Last edited by picowallspeaker; 12th April 2014 at 08:50 PM.
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Old 12th April 2014, 08:59 PM   #5
xrk971 is offline xrk971  United States
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You might want to try getting a miniDSP and a couple of low cost class D amps and play around with bi amped DSP crossovers. It really lets you quickly experiment with XO settings and optimize the XO freq and slope on the fly. You will need a measurement mic and software. I can highly recommend the Dayton UMM-6 and REW software. With this setup you can actually make nice sounding designs without being a master passive XO designer.

For starters many agree that an Alpha 15a is the woofer to get. You can try many different fullrange tops. Look in the Cheap and FAST OB thread for examples. The Faital Pro 4FE35 seems to be nice option.

This is the correct forum for this btw.
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Old 12th April 2014, 09:01 PM   #6
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GRS are great ! Save 14 $ for each quartet and buy 8
GRS Speakers? for new or replacement use.

ANd make 8 H boxes, by connecting in series//--parallel connection for having 8 Ω impedance.

Throw in a super full range .quite exotic like a big Tang Bang
Tang Band W8-1808 8" Neodymium Full Range Driver | 264-894

We weren't talking about saving, ..
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Old 12th April 2014, 09:11 PM   #7
xrk971 is offline xrk971  United States
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Or get qnty 16 x 8 in budget woofers and build an 8 driver slot loaded woofer.

The GRS are also used by the budget Manzanita. Looks like a good choice too.
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Old 12th April 2014, 10:24 PM   #8
Rudolf is offline Rudolf  Germany
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Quote:
Originally Posted by ScottLowe View Post
I want a 15" woofer a "full range" and a tweeter on an open baffle ...
That's clearly a case for the Multi Way forum. A crossover for woofer, midrange and tweeter is never "super simple". Maybe you better built one of MJKs designs: http://www.quarter-wave.com/OBs/OB_Design.pdf.
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Old 12th April 2014, 10:38 PM   #9
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Thank you Rudolf .If the baffle was bigger would that be better ? I just remember when I put some 7"x10" telefunkins on a 4'x4' [1/2 sheet plywood each] they had more bass than when I put hinges on them and made "folding baffles " of them.
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Old 13th April 2014, 11:05 AM   #10
Rudolf is offline Rudolf  Germany
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Quote:
Originally Posted by ScottLowe View Post
If the baffle was bigger would that be better ?
A bigger baffle raises the bottom frequencies (which would be considered good) and compromises the upper midrange/lower treble region (which would be considered bad).
There are no easy answers in building OBs. In other words: Cutting the wood is by far the easiest task.
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