Need some thoughts/adjustments (big) (1 Viewer)

[Jedd]

I'm trying to keep low profile and budget, to learn what to do and how to do.
So I decided for small sealed shiva sonotube.
- 12"x4' tube from home-depot ~ 89L cabinet (w/o driver and cap)
- shiva driver - upfiring, to seal the tube from the top, and avoid legs mounting
- couple sheets of 1/2" MDF to seal the rest
- 75W power from the receiver
- some tools to cut&glue
So I downloaded the lspCAD and "designed" (just put tube and room size in) the cabinet.
Here what I got:

Are those numbers look good or I'm missing something badly?
What other parts should I order? (terminals, x-over)
What should I stuff it with and how much of stuff do I need?
Thanks

 

[ArmenK]

how do you plan on keeping the driver in place at the end of the sonotube?

 

[jeff lam]

It will be top heavy with the driver mounted on top. It could fall over. Why not just use the down firing design and use legs?

 

[Jedd]

Hmm, maybe I'll balance it with an iron plate, so it wont trip over.

The problem is how to mount 12" driver into the 12" tube. I hope 1/2" wooden circle-washer and 2 all-thread rods or 2 wooden sticks will be enough to support the weight of the driver. (although I never saw how Shiva looks like, so I might be completle wrong here)

In downfiring design I have no idea how to keep the driver from falling and legs become an issue too. (I'll have to glue them on sides or something)

 

[Dustin B]

I suggest you go to Adire's webpage and download the white paper on the Shiva, actually, here I'll even find the link for you:
http://www.adireaudio.com/Files/ShivaWhitePaper-V2.PDF
Contained in that PDF file is a schematic of the driver with detailed dimensions.

 

[jeff lam]

Just make a larger endcap, then mount the legs on the cap. With a 12" driver you are acually better off going with 14-16" sonotube.

 

[Jedd]

Jeff, somehow I thought about diving driver into the tube, instead of putting it out on the cap, thanks. (feel a bit stupid :b )

Of course I'd like to get 16" tube and put Tempes inside, but the problem is that everything >12" costs > $100, 12" is just a $7

Dustin, it was the firt document I've read. Shiva needs only 11" hole to fit in, that's why I hope to do it with a 12" tube.

What do you think about graphs, are they any good or I should work on them more?

 

[Patrick Sun]

So basically you have a 1" wide ring of MDF 12" in outer diameter. That's not a lot of margin for the screw hole integrity for each screw hole. I hope you hammer in a lot of nails around the perimeter, and glue/caulk the hell out of it.

Otherwise, you're ok.

 

[TedO]

Jedd,

I called around and found a 20" dia x 6' Sono tube for $30. You just have to shop. I found the price at a masonary supply store, I just looked in the yellow pages under concrete supply and started calling. The most exspensive piece I found was over $7 a foot.

I have been amp shopping also, I found a 3 month old QSC RMX2450 and the guy is going to sell it to me for $425.

If you want to save money put in the time and shop, the deals are out there.

TedO

 

[Jedd]

So basically you have a 1" wide ring of MDF 12" in outer diameter. That's not a lot of margin for the screw hole integrity for each screw hole. I hope you hammer in a lot of nails around the perimeter, and glue/caulk the hell out of it.

That's the plan.
Although it's 1/2" wide ring only, so I'll put it on the 13" square with the 11" hole, glue them together and screw the driver with the long thin screws.