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Old 13th September 2013, 07:20 PM   #11
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Join Date: Jun 2002
Location: 3RS
Remember that most commercial loudspeakers cabinets are made of MDF. Many are very good too !
I would use two layers of 3/4 inch MDF and a spacer of 3/4 inch MDF. Over all it would become 2 1/4 inch thick. You will need to design the spacer carefully to ensure that when you put in the sand it will be able to flow completely into the empty space. You should also be careful because the panel would become pretty heavy as the sand fills up. Might be useful to have a helping hand around.

But before doing all that build a cheap thin ply version to see if everything fits and works OK. Buy used 1/2 inch or thinner ply for this. Of course with big and heavy bass drivers you can't use very thin ply.

I just bought an Eminence Beta CX-10 ( 10 inch) driver with a Eminence ASD1001 compression driver. The CX-10 has a horn built into it and has a screw mount for the ASD1001 on it's rear. I like what I hear.It certainly is not shouty !
I will be doing some testing soon. Right now it's being run in with music and TV sounds without any baffle!

The bass will be handled by a separate sub. Not sure right now if it will be a dipole or a sealed sub. Depends on how low the CX-10 will go with some equalisation. The Qts is 0.39 on the data sheet.

Last edited by ashok; 13th September 2013 at 07:23 PM.
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Old 13th September 2013, 07:33 PM   #12
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Very good idea. Thank you for the advice.
Wow! That's affordable. Shows that not all expensive things are superior.
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Old 13th September 2013, 08:01 PM   #13
PKI is offline PKI  United States
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I was playing with A10.2 and Alphas 15 in U-frame all last weekend. Unfortunately, I think that 10.2 is too small to play good with 15'' woofer. It is kinda ok, but just doesnt give you that big sound you get from a bigger driver(beta 12 lta for example). IMHO, 8" is a min size for a mid driver to mate with 15" woofer.
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Old 23rd September 2013, 01:21 AM   #14
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Any other drivers you would recommend for open baffle?
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Old 23rd September 2013, 02:40 AM   #15
zobsky is offline zobsky  India
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Location: Dallas, Tx, USA
Originally Posted by Democles902 View Post
Hello, I am looking for help in regards to an open baffle design. I am trying to find a good coaxial candidate but am having no luck. Full range seems to be the only option besides a two or three way. I am planning on using these- AE Speakers Online Store - For bass. They are specifically designed for open baffle use.
If you have any suggestions for the best drivers and or combinations I would be grateful.
I am open to designs with planar transducers, full range drivers, and really anything else.
Thank you.
If you're looking for purpose built OB drivers,.. These seem to fit the bill,.. Though I haven't heard them
Hawthorne Audio - Drivers
"Not everything that can be counted counts, and not everything that counts can be counted." - Albert Einstein
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Old 23rd September 2013, 04:33 AM   #16
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Location: New York
I have a project drawn up I intend to build before the weather gets too cold. I am hopeful that good drivers, regardless of Qts, can be used on open baffle. Basically it's a 20" x 40" baffle with a powered 15" 'helper' woofer - also open baffle. Since using a typical sub amp on the 15" woofer its response will be adjustable from approx 200Hz down. My hope is that even low Qts drivers (such as the Fostex 165k) will produce strong sound to 200Hz. My sims look promising and I hope it works.
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Old 23rd September 2013, 04:57 AM   #17
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Do you have any particular requirements in mind or do you just want a nice OB system?
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Old 30th July 2014, 09:20 AM   #18
hpham is offline hpham  Viet Nam
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I prepairing to build an open baffle with the shape simillar Trio 15(pure audio project). But the woofer Eminiance Alpha 15 seem doesn't weel review before on OB design (muddy). Please advise few model suitble for OB especially parallel woofer and fullrange.
I'm not yet buil OB so alot of question in my mind and confusing on chosing driver as well as xover point of frequency.
Well come all suggestion.
Thank you.
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Old 30th July 2014, 10:49 AM   #19
xrk971 is offline xrk971  United States
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I have built OB woofers using the slot loaded OB (SLOB) concept. I got the idea from Nelson Pass' slot loaded OB design but implemented it in a narrow 12 in wide baffle with good bass extension. It uses many smaller woofers in a push pull force canceling configuration which also provides a reduction in second order suspension introduced distortion. The added benefit is that the drivers are mounted 90 deg relative to the baffle face and this keeps the baffle narrow. The bass quality is exceptionally good and very articulate with a very realistic presentation of the soundstage. My concept uses the low cost Vifa TC9FD for the fullrange which works very well. Recently I am using a PRV 5MR450-NDY for the top and that sounds exceptionally good with harmonic distortion at -60dB referenced to 90 dB SPL at 1m.

More details on the SLOB here: Cheap and FAST OB, Literally

Ztransform has also made a similar design (independently) and he also ended up using the TC9FD for the tops. More info here:
Novel Open Baffle Construction Techniques

There is something very visceral about the bass from a SLOB when used with a good full range driver. The dynamics are just really superb and there is an immediacy to the sound with percussion transients reproduced with excellent realism. The extension down to 30 Hz is achieved using high Qts woofers without equalization even. Here is the response I achieved with 5MR450-NDY and a $60 class D 2.1 amp with built in XO (tops run full range, woofer with built in amp low pass XO):
Click the image to open in full size.

More info on the the 5MR450-NDY driver can be found here (as a 95dB sensitive 200Hz to 15kHz capable driver with ultra low distortion and smooth response, it is in my opinion, one of the best drivers as the top on a 2 way FAST OB): PRV 5MR450-NDY for FAST applications

Click the image to open in full size.

Last edited by xrk971; 30th July 2014 at 10:53 AM.
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