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Old 25th May 2012, 06:53 PM   #1
solhaga is offline solhaga  Sweden
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Default OB with elegance

I got tired of my sloppy h-frame columns with Alpha 15As that I built two years ago.
The sloppiness was even worse due to this idea to lower the fs by applying weight to the cones and thereby also upping the Qts.

Last edited by solhaga; 25th May 2012 at 06:58 PM. Reason: Spelling
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Old 25th May 2012, 06:55 PM   #2
solhaga is offline solhaga  Sweden
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So I thought I get me some new woofers:
Click the image to open in full size.
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Old 25th May 2012, 07:07 PM   #3
solhaga is offline solhaga  Sweden
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This time I didn't want to go H-frame, U-frame or any frame at all.
An animated thread on a Swedish forum lead to the conclusion that I don't need to get framed at all.

Given some high excursion, low Qts and low distorsion woofers one could just as easily Eq all the way to the goal.

Provided of course that the woofers were direct driven, and in my case, by one GC per element driven by separate USB DAC woofer outputs, one for each side. Frequency Allocator should do the filtering and Equing.

So let´s go OB.
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Old 25th May 2012, 07:11 PM   #4
solhaga is offline solhaga  Sweden
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The design idea was to magnet mount the woofers so that the baffle could stand on its own feet and thus be slender and easily adjustable.
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Old 25th May 2012, 07:15 PM   #5
solhaga is offline solhaga  Sweden
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First attempt proved to be a little bit weak. So I decided to go MDF. Had some laying around the house:
Click the image to open in full size.
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Old 25th May 2012, 07:17 PM   #6
solhaga is offline solhaga  Sweden
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So one woofer at 40 cm, the other at 85 cm and the third at 130 cm:

Click the image to open in full size.
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Old 25th May 2012, 07:20 PM   #7
OllBoll is offline OllBoll  Sweden
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Quote:
Originally Posted by solhaga View Post
This time I didn't want to go H-frame, U-frame or any frame at all.
An animated thread on a Swedish forum lead to the conclusion that I don't need to get framed at all.

Given some high excursion, low Qts and low distorsion woofers one could just as easily Eq all the way to the goal.

Provided of course that the woofers were direct driven, and in my case, by one GC per element driven by separate USB DAC woofer outputs, one for each side. Frequency Allocator should do the filtering and Equing.

So let´s go OB.
While you don't have to use a frame isn't that basically just a waste of excursion and in the end a worse performing system than one with frames?
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Old 25th May 2012, 07:21 PM   #8
solhaga is offline solhaga  Sweden
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First rude cut-out for the magnet:

Click the image to open in full size.

I later trimmed it a bit and also applied contruction adhesive to even the surface.
It is ofthe outmost importance that the back of the magnet cannot move versus the mounting.
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Old 25th May 2012, 07:28 PM   #9
solhaga is offline solhaga  Sweden
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All six cut-outs:
Click the image to open in full size.

Looking at it this way, it would have been easier to first do the cut-outs and then split the board. Maybe next time I do it right. (or let a professional carpenter do the work)
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Old 25th May 2012, 07:30 PM   #10
solhaga is offline solhaga  Sweden
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Quote:
Originally Posted by OllBoll View Post
While you don't have to use a frame isn't that basically just a waste of excursion and in the end a worse performing system than one with frames?
Could be, but according to my calculations it won't (and later, also in practice).
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