Using 3/4" ply for Omni 15 Tallboy

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smalltownsound
Posts: 9
Joined: Tue May 05, 2020 7:38 am

Using 3/4" ply for Omni 15 Tallboy

#1 Post by smalltownsound »

Hi all,
Working on some Omni 15 TallBoys in Scotland.
We already had a lot of really nice quality 3/4 inch ply leftover from a previous job, so we decided to do the build out of it due to a limited budget. Also the only 1/2 ply available nearby was Chinese hardwood and its pretty terrible quality.
Extra weight isn't such an issue for us, and we couldn't see any other major drawbacks of using this thicker wood.

Though we are doing the horn our of 1/2 ply to make cutting easier. (is this a bad idea?)

By using this thicker ply for the cab, do we still need to build the same kind of internal supports? Also is there any notable changes we should be making before constructing the cab? Have finished all of the cutting, and gluing starts this weekend so just wanted to ask before then...
We have made the base and top a little bit wider to account for the thicker wood, but other than that we aren't really making any changes...

Thanks :)
Seb

Bruce Weldy
Posts: 8007
Joined: Fri Nov 27, 2009 11:37 am
Location: New Braunfels, TX

Re: Using 3/4" ply for Omni 15 Tallboy

#2 Post by Bruce Weldy »

smalltownsound wrote: Thu Jul 09, 2020 7:52 am Hi all,
Working on some Omni 15 TallBoys in Scotland.
We already had a lot of really nice quality 3/4 inch ply leftover from a previous job, so we decided to do the build out of it due to a limited budget. Also the only 1/2 ply available nearby was Chinese hardwood and its pretty terrible quality.
Extra weight isn't such an issue for us, and we couldn't see any other major drawbacks of using this thicker wood.

Though we are doing the horn our of 1/2 ply to make cutting easier. (is this a bad idea?)

By using this thicker ply for the cab, do we still need to build the same kind of internal supports? Also is there any notable changes we should be making before constructing the cab? Have finished all of the cutting, and gluing starts this weekend so just wanted to ask before then...
We have made the base and top a little bit wider to account for the thicker wood, but other than that we aren't really making any changes...

Thanks :)
Seb
Use the 3/4 for all the outside pieces and stick to 1/2 for the internal parts and braces.

6 - T39 4-25" 2-22" 3012LF
4 - OT12 2512 Melded/NSD2005
1 - T24
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

Grant Bunter
Posts: 6700
Joined: Mon Nov 28, 2011 11:12 am
Location: Ilfracombe Queensland Australia
Contact:

Re: Using 3/4" ply for Omni 15 Tallboy

#3 Post by Grant Bunter »

smalltownsound wrote: Thu Jul 09, 2020 7:52 am Hi all,
Working on some Omni 15 TallBoys in Scotland.
We already had a lot of really nice quality 3/4 inch ply leftover from a previous job, so we decided to do the build out of it due to a limited budget. Also the only 1/2 ply available nearby was Chinese hardwood and its pretty terrible quality.
Extra weight isn't such an issue for us, and we couldn't see any other major drawbacks of using this thicker wood.

Though we are doing the horn our of 1/2 ply to make cutting easier. (is this a bad idea?)

By using this thicker ply for the cab, do we still need to build the same kind of internal supports? Also is there any notable changes we should be making before constructing the cab? Have finished all of the cutting, and gluing starts this weekend so just wanted to ask before then...
We have made the base and top a little bit wider to account for the thicker wood, but other than that we aren't really making any changes...

Thanks :)
Seb
You need to keep the internal dimensions of the cab the same, or it won't perform as expected.
So, yes, use 3/4 on the outside, and as Bruce suggested 1/2" on the inside.
Yes, you need to do the braces...
Built:
DR 250: x 2 melded array, 2x CD horn, March 2012 plans.
T39's: 4 x 20" BP102 , 2 x 28" 3012lf.
WH8: x 6 with melded array wired series/parallel.
Bunter's Audio and Lighting "like"s would be most appreciated...

djlivex
Posts: 525
Joined: Thu Dec 17, 2009 7:34 pm
Location: Tampa, FL

Re: Using 3/4" ply for Omni 15 Tallboy

#4 Post by djlivex »

I did my Omni 12 Tallboy old plans as per plans used neo drivers 12 and 6.5 " and put the 1/4" holes grill in front of the cab from Reliable Hardware and it made the cab heavy from the full grilles. Sounds amazing for the 12" version though. (DJ work)
BaasssS, . . how low can you GO!

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