Keystone Sub Using 18, 15, & 12 Inch Speakers

Hey Art,
I've finally got around to making some sawdust on this build, I have a quick question about the baffle cutout. The plans posted by tb46 indicate an opening with a 16" diameter, the diameter of the gasket on my 18TBW100 is closer to 16.75" and I worry about the surround slapping at high input levels. I reckon that a opening of 16.5" would allow the driver to move without hitting the baffle, but will still allow the gasket to seal, do you happen to recall what your experience was?

-Thanks
 
Fired up my 18TBW100 loaded Keystone, mo measurements but referenced against a SRX728 I was quite impressed. Now for the fun part: truing/rounding corners, sanding, painting. Fun.

I know it came up but not sure if anyone answered, lots of clearance between the magnet and baffle.

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Keystone bracing

Art,

Can you clarify the bracing you installed near the Keystone exit panel. I’m unsure of what the layout is with the angled brace/s from your original build sketches.

Our build photo shows the other side compared to PASC’s photo.

Build is well underway :> cheers
 

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Art,
Can you clarify the bracing you installed near the Keystone exit panel. I’m unsure of what the layout is with the angled brace/s from your original build sketches.
Mars,

It appears PASC doubled up on braces #3 and #5. The original plan has a single brace # 5 (which you outlined in red) attached to the vertical brace #4 and the top front piece.

Only the braces that say "X 2" (times 2) were doubled in the original plan.

In the photo below you can see brace #4 centered between the 2 x 12" speakers, brace #5 offset to the right connecting to the front panel just above the Keystone exit.

Art
 

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My First Keystone Build

Getting closer to test of my first build. This is what I have so far. All my internal dimensions are within 1/8" to 3/16". The braces sure took me longer to fiddel in than I would have guessed....:rolleyes:

I am going to try it out with a Peavey Low Rider 18 that I have on hand and see how it does.
 

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Getting closer to test of my first build. This is what I have so far. All my internal dimensions are within 1/8" to 3/16". The braces sure took me longer to fiddel in than I would have guessed....:rolleyes:

I am going to try it out with a Peavey Low Rider 18 that I have on hand and see how it does.

Hmm.. where's the mouth for the subwoofer in those pictures?

I wish I could get away with so little bracing for the plywood that's available here for subwoofer building. I basically bifurcated my last subwoofer all the way down to the last fold with a cross-brace, and still the top vibrates a bit more than I'd like. Doubling up on the thickness of the top panel didn't help much either.
 
Hmm.. where's the mouth for the subwoofer in those pictures?

I wish I could get away with so little bracing for the plywood that's available here for subwoofer building. I basically bifurcated my last subwoofer all the way down to the last fold with a cross-brace, and still the top vibrates a bit more than I'd like. Doubling up on the thickness of the top panel didn't help much either.

Had not yet cut out the "keystone" mouth. It goes top left.

I did finish one cab yesterday and a quick listen brought smiles to my face.

Kudos to weltersys for a great sounding design! I will attempt some measurements later this week and share what I observe.