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Old 23rd December 2011, 03:05 AM   #81
a.wayne is offline a.wayne  United States
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Hello Guys,

Has anyone actually tested this driver....... ? any numbers ...?


Regards ..
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Old 23rd December 2011, 03:25 PM   #82
tb46 is offline tb46  United States
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Hi permo,

Post #80: "...have not cut any wood yet...".

Usually, on a layout like this, you would start by drawing the location of the dividers on the inside of a side board. For that method the side board would be the full size of the outside of the box (depth and height). All the internals would then be the same width.

But, you may want to consider another possibility, namely attaching the top and bottom (and the 2 internal dividers) to reduced size side plates, and then mounting front and rear boards against that from the outside. The tops and bottoms would be the same width as the front and rear. Together with the two internal dividers that would be by far stable enough, and you can attach the front and rear boards with screws to the sides and top/bottoms, and to whatever braces you add on the inside. It's easy to change the dimensions, the side board height = total box height minus 1.44" (2 x 0.720"), and the depth = total box depth minus 1.44". The front and rear would be total box height x total box width, and you just cut out the front opening to fit. If you are worried that the sides of the front opening are getting a little too weak you can add a little thickness there, and increase the height to give you the same S4 (or, you brake up the front board into two pieces, and fill in the gaps on the side board with wood strips).

I doubt that it is necessary to double up on any of the wood pieces, even though it cannot hurt as long as you make up for any reduced air path volume.

Anyway, just another way to look at it.

Regards,
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Last edited by tb46; 23rd December 2011 at 03:32 PM.
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Old 23rd December 2011, 06:10 PM   #83
tb46 is offline tb46  United States
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Hi permo,

I had a little extra time and scratched around on the drawing a little more with respect to implementing side access lids for an inverted driver. As bjorno suggested, it would be easiest to just double up on the driver baffle, and, to provide additional wood to screw into, I also doubled up on the bottom section of the vertical divider. The outside dimensions change a bit (when you make the box deeper the duct length increases, so you have to reduce the height a little, etc.). With this change the S1 to S2 section now has its normal taper back, and S1 is as in bjorno's original design.

Again, you only need the side access lids (one on each side) if you go for the Push-Pull driver arrangement.

Regards,
Attached Files
File Type: pdf T-TQWT_by bjorno_for permo_Rev_02.pdf (28.1 KB, 75 views)
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Last edited by tb46; 23rd December 2011 at 06:12 PM.
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Old 23rd December 2011, 07:39 PM   #84
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Quote:
Originally Posted by tb46 View Post
Hi permo,

I had a little extra time and scratched around on the drawing a little more with respect to implementing side access lids for an inverted driver. As bjorno suggested, it would be easiest to just double up on the driver baffle, and, to provide additional wood to screw into, I also doubled up on the bottom section of the vertical divider. The outside dimensions change a bit (when you make the box deeper the duct length increases, so you have to reduce the height a little, etc.). With this change the S1 to S2 section now has its normal taper back, and S1 is as in bjorno's original design.

Again, you only need the side access lids (one on each side) if you go for the Push-Pull driver arrangement.

Regards,
Man you are good. I think I might have to modify my cutsheet now and do the double baffle. I like that idea.
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Old 24th December 2011, 12:23 AM   #85
tb46 is offline tb46  United States
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Hi permo,

I noticed I made a mistake when plotting the drawing to pdf. I got the wrong portion of the drawing (by now there are a bunch of boxes in it). So I'll call this one the "finished" version Rev_02b.

Please, note the depth change to 23.614" outside dimension, and the change of S1. I also added a few additional dimensions.

I hope you'll go through this in detail to catch any other errors. Would be nice to end up with a finished drawing of sorts.

Regards,
Attached Files
File Type: pdf T-TQWT_by bjorno_for permo_Rev_02b.pdf (30.0 KB, 53 views)
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Old 24th December 2011, 01:14 AM   #86
tb46 is offline tb46  United States
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Hi again,

And the wood cutting layout, hope I got that one correct.

Regards,
Attached Files
File Type: pdf T-TQWT_by bjorno_for permo_Rev_02b_wood.pdf (21.4 KB, 62 views)
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Old 24th December 2011, 02:44 AM   #87
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My gosh you make great drawings. I love the idea of the double thick baffle.
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Old 24th December 2011, 03:50 AM   #88
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I REALLY, love the new design. The 1.5" thick MDF baffle is a fantastic idea. I am starting to get really anxious, but I am having a hard time deciding what wood to use in addition to MDF. Baltic Birch is so dang spendy....but I would hate to cut corners on this project.
To make a long story short, all the internal baffles, dividers and braces will be 3/4 inch MDF for sure. Its the outside panels which I will be sanding and staining that I am most concerned with...the top, bottom, front, rear, and sides.

I am still leaning towards both drivers just firing forward, but I still like the idea of the extra 22" on the vertical divider right behind the drivers.

I have all my screws, 1 1/2 inch sheetrock, wood glue, liquid nails, foam weatherstripping for removable panels, terminal cup...etc..etc.. Just need to take the plunge on wood.

Cut Sheet

One 51 5/16" X 10 1/16" (Back removable)
One 41 31/32" X 10 1/16" (removeable top front, above slot)
One 4 11/16" X 10 1/16" (Bottom Front Below Slot)
Two 22 3/16" X 10 1/16" (Top and Bottom)
Two 49 7/8" X 22 3/16" (sides)
One 22" X 8 5/8" (vertical divider brace)
One 42 31/32" X 8 5/8" (vertical divider long)
two 44 3/32" X 8 5/8" (double slanted divider)







Top and Bottom sits on top of the sides and behind the front and rear

Last edited by permo; 24th December 2011 at 04:11 AM.
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Old 26th December 2011, 05:44 PM   #89
zobsky is offline zobsky  India
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arauco ply, in the US, is acceptable, though not very pretty. Available at home centers
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Old 27th December 2011, 02:36 AM   #90
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I chose 3/4 inch MDF. The material was cut today. I bought two full 97 x 49 inch boards.

The double thick baffle and horizontal divider are currently under a hydraulic press with veneer glue in between the layers being sandwiched.

I will begin construction tomorrow and I will post pictures as I put it together. I am going to go with the dual forward facing configuration with removable top front hatch (above the slot)

This is going to be an awesome subwoofer.

The only issue right now is I can't find any documentation regarding the size of the cutout.

Last edited by permo; 27th December 2011 at 02:39 AM.
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