Fat Man and Little Boy Build - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 61 Old 07-01-2015, 11:32 PM - Thread Starter
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Fat Man and Little Boy Build

I have rather hastily put this thread together as I wasn’t quite ready to post. The Little Boys will come at a later date, but the big beast of a sub aka Fat Man, though not completely finished, is now doing its thing in the nearfield. The design(Sonotube) is twin 30”Dx24” sealed dual opposed direct coupled vertically stacked subs. Each cab is 9.2 cuft loaded with 2xSI HT18D2 subs. Overall height once finalized with top cover installed is about 66 inches.

This is the easiest and quickest of the hundred plus subs I’ve built the last 30 years. The hardest thing here was naming the subs. There’s always the moons of Saturn, Greek Mythology, Roman military terms, even names of the various ICBM’s. I just kept coming back to B movie terms which I adore. Such stunners as Pillars of Peril, Cylinders of Catastrophe, Death Silos, Drums of Doom or Destruction and Tubes of Terror (my personal favorite). I even had a thought to put it to my fellow DIYer’s, you guys, to name them. How cool would that be. I can only imagine how ridiculous and fun that would be. Hey if you feel the need, have at it. Anyway its been seventy years since the last Fat Man and Little Boy build and these certainly fit the description so why not.

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Last edited by coolrda; 08-18-2017 at 11:00 PM.
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post #2 of 61 Old 07-02-2015, 12:04 AM - Thread Starter
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Here's a calculator for figuring cab volume. These cabs are all about cutting circles, tons of circles, circle after circle. The tubes were purchased for about a $100 at White Cap HD and they cut them to my specs. Then I bought 3 sheets of MDF from Home Depot and had them cut to spec so that I wouldn't have to. Total cost for all materials and eight subs was about $1600.








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post #3 of 61 Old 07-02-2015, 12:22 AM - Thread Starter
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There is 4 30" diameter inner baffles with 16.75" cutout for the sub that fit very tight and are simple glued into each tube. Then a second outer baffle that is 32" diameters glue to the inner baffle making an 1.5" thick end cap/baffle that is secure.



Flush trimmed.







Outer/mounting baffles.



The the direct coupling rods,1" Poplar dowels.



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post #4 of 61 Old 07-02-2015, 04:25 AM
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What is the black finish on the cardboard sonotube?
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post #5 of 61 Old 07-02-2015, 04:59 AM
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What is the black finish on the cardboard sonotube?
It looks like some kind of wrap. Very nice finish.
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post #6 of 61 Old 07-02-2015, 07:01 AM
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nice work.

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post #7 of 61 Old 07-02-2015, 07:38 AM
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Looks great man!!! You don't see to many sono builds anymore!

Blasting brown notes for 10 years and counting!

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post #8 of 61 Old 07-02-2015, 07:40 AM
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I like!

Check out my End-Table Marty Build
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post #9 of 61 Old 07-02-2015, 07:42 AM - Thread Starter
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Thanks, Guys.
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post #10 of 61 Old 07-02-2015, 07:58 AM - Thread Starter
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Originally Posted by Stereodude View Post
What is the black finish on the cardboard sonotube?
Ostrich. Synthetic, as real is 3X the cost. Its a family owned Auto upholstery wholesaler/retailer that I buy my stuff from. Much higher quality than typical fabric stores. And heres the spray glue. It sticks and stays, but if you have to change it you can still get it off without tearing things up.



Very heavy material.



Forget the stuff from Lowes or Home Depot. This glue works.

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post #11 of 61 Old 07-02-2015, 08:34 AM
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Looks great man!!! You don't see to many sono builds anymore!
FWIW, I don't plan to build any more of them myself. I built a pair of dual opposed sonotubes, and just feel they're too large for the same volume of air I can get in a smaller box (relatively speaking).
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post #12 of 61 Old 07-02-2015, 08:36 AM
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Ostrich. Synthetic, as real is 3X the cost.
I thought it looked like leather. I did the leather look Duratex finish on my sonosubs, but could see that's not what you did.
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post #13 of 61 Old 07-02-2015, 08:39 AM
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Originally Posted by Stereodude View Post
FWIW, I don't plan to build any more of them myself. I built a pair of dual opposed sonotubes, and just feel they're too large for the same volume of air I can get in a smaller box (relatively speaking).

Dual opposed would be pretty cool. I've only ever done 1 and it was only a 12" shiva. It literally took and hour to build. What did you use in the dual opposed?

Blasting brown notes for 10 years and counting!

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post #14 of 61 Old 07-02-2015, 08:45 AM
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Dual opposed would be pretty cool. I've only ever done 1 and it was only a 12" shiva. It literally took and hour to build. What did you use in the dual opposed?
AE AV15-H

Build Thread
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post #15 of 61 Old 07-02-2015, 09:46 AM - Thread Starter
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Dual opposed would be pretty cool. I've only ever done 1 and it was only a 12" shiva. It literally took and hour to build. What did you use in the dual opposed?
Two SI HT18D2's per Cab.
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post #16 of 61 Old 07-02-2015, 09:26 PM - Thread Starter
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After a great dinner tonite just having fun with the Fat Man.

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Last edited by coolrda; 07-09-2015 at 10:55 AM.
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post #17 of 61 Old 07-03-2015, 05:40 AM
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I used to build plenty of tube-based subs in the late 90's/early 2000's. Never thought about wrapping them in that material. That REALLY looks amazing! Fantastic idea to dress them up.

Thanks for sharing all the build pics too, really brought back some fond memories.

Any pics of your room with all the subs in place?


.
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post #18 of 61 Old 07-03-2015, 09:52 AM
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Fat Man and Little Boy Build
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post #19 of 61 Old 07-03-2015, 12:03 PM - Thread Starter
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LOLOLOLOL. Oh crap what was I thinking. It's been three quarters of a century, i thought it was safe.
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post #20 of 61 Old 07-03-2015, 07:30 PM
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post #21 of 61 Old 07-03-2015, 07:32 PM
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Been awhile since I've seen a nice Sonotube build. Nicely done!
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post #22 of 61 Old 07-03-2015, 07:32 PM
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Originally Posted by Stereodude View Post
FWIW, I don't plan to build any more of them myself. I built a pair of dual opposed sonotubes, and just feel they're too large for the same volume of air I can get in a smaller box (relatively speaking).
How so? How is a box more efficient at volume compared to a cylinder?
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post #23 of 61 Old 07-03-2015, 07:34 PM
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After a great dinner tonite just having fun with the Fat Man.

https://www.youtube.com/watch?v=moQ8EobTca8
^^^This is just cool...and impressive! Could you do that before the Fat Man?
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post #24 of 61 Old 07-03-2015, 07:37 PM - Thread Starter
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^^^This is just cool...and impressive! Could you do that before the Fat Man?
Nope.
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post #25 of 61 Old 07-03-2015, 08:19 PM
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How so? How is a box more efficient at volume compared to a cylinder?
A 24" cylinder compared to a 24" x 24" x X" box, the box ends up a lot shorter for the same volume. Plus in a dual opposed config you have to lift the enclosure to give the bottom driver clearance which makes it even taller. Whereas they go on the sides of a box with no height penalty.
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post #26 of 61 Old 07-03-2015, 08:31 PM - Thread Starter
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Originally Posted by Stereodude View Post
A 24" cylinder compared to a 24" x 24" x X" box, the box ends up a lot shorter for the same volume. Plus in a dual opposed config you have to lift the enclosure to give the bottom driver clearance which makes it even taller. Whereas they go on the sides of a box with no height penalty.
Actually the Little Boys will be laying on their side giving me the same benefits of the vertical stack up front.

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post #27 of 61 Old 07-03-2015, 11:47 PM - Thread Starter
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Originally Posted by rms8 View Post
I used to build plenty of tube-based subs in the late 90's/early 2000's. Never thought about wrapping them in that material. That REALLY looks amazing! Fantastic idea to dress them up.

Thanks for sharing all the build pics too, really brought back some fond memories.

Any pics of your room with all the subs in place?


.
Thanks, I will post pics soon as I get the fronts done.
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post #28 of 61 Old 07-05-2015, 10:36 PM - Thread Starter
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Originally Posted by Stereodude View Post
A 24" cylinder compared to a 24" x 24" x X" box, the box ends up a lot shorter for the same volume. Plus in a dual opposed config you have to lift the enclosure to give the bottom driver clearance which makes it even taller. Whereas they go on the sides of a box with no height penalty.
While that can be true I prefer the looks in open space or even in a niche like mine, the slot loading increases tactile response (on 2-axis), lowers distortion and pressurizes a room to a greater degree than common baffled drivers. The place I bought the Sonotubes from has these in any size from 6' to 60" in diameter and they cut to size from inches to 10 feet long. Equal wall and corner loading of DO cabs can only be accomplished by stacked arrays whether cylindrical or rectangular boxes.
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post #29 of 61 Old 07-09-2015, 11:31 AM - Thread Starter
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Ok so my sons friend was over and put an Olloclip on my phone to show some stuff. I really wanted to keep it for a couple days. Amazing vids with the different lenses. Then he showed me the slo mo. Nice. So I thought what I could shoot to slow. With the help of Tom Cruise and his 150 million dollar test cd I got this. Non edited EoT intro. You can count down the freqs. There's some funkiness going on down at 10hz. Looks like a square wave to me.

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post #30 of 61 Old 07-09-2015, 12:00 PM
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Def square wave (or amp clipping...)
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