THAM 12 - 12mm plywood? |
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XentriK Sound
Registered User Joined: 02 March 2017 Location: Devon Status: Offline Points: 17 |
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Posted: 11 May 2017 at 2:39pm |
Finally got round to buying plywood for the tham 12's and couldn't find any 15mm so went for 12mm... don't suppose anyone's previously done the same and could give me pointers on how to modify the plans to get it to work?
*It's only for a 12v battery powered system so won't be having anything heavy stacked ontop* |
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cookie-dj
Young Croc Joined: 09 May 2014 Location: Warwickshire Status: Offline Points: 977 |
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I have a pair of Tham 12 and I would seriously suggest at least 15mm, these things can move some air for their size and a heavier and more substantial material would be preferred.
Maybe you could look at adding further bracing where you can if 12mm is a must.
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You can't polish a turd!
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bitSmasher
Old Croc Joined: 23 June 2012 Location: Melbourne Status: Offline Points: 2295 |
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Lots of bracing, especially around the throat/mouth
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https://www.instagram.com/batteryacidsoundsystem/
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Shortrope
Young Croc Joined: 08 July 2013 Location: Ireland Status: Offline Points: 1232 |
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The hardest part about building with 12mm is the joints.
I've made non speaker stuff with it and found using a 3.5mm screw with the right size pilot was ok. You need to be very accurate in getting your screw in the very centre of the ply edge, it's very easy to split or bulge the ply. Battened joints on the exterior edges would be a good call too. Unless of course you rebate everything. |
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My Tinnitus is coming along nicely!!
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mini-mad
Old Croc Joined: 13 July 2012 Location: london Status: Offline Points: 6903 |
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Why not add some sort of beading or small 5mm x 5mm length of timber and use it to make batons along all the mouth and around as much as you can to increase surface area around joints and double all other bracing... bass cabs will "pulse" if not braced or made of to thinner wood.
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If it sounds like a gorilla is trying to escape, turn it down.
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XentriK Sound
Registered User Joined: 02 March 2017 Location: Devon Status: Offline Points: 17 |
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Thanks for all of your replies :)
I'm going to put double the bracing throughout. Perhaps one 1/3 of the width and the other 2/3? Or should i just put them up against each other? (sorry if that doesn't make sense, im not sure how to explain it any other way) I was thinking of putting small L shaped brackets throughout but batons would be much more effective. |
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studio45
Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3864 |
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Yes, do 2 braces per horn section spaced evenly as you say. Corner reflectors are a good idea too, they add strength in the corners of the box and smooth out the horn path. Use a pencil and compass off the edge of the nearest panel to work out where and how big to make them, you want to block off excess space in the corner while maintaining continuous expansion.
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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magnus h
Registered User Joined: 13 August 2013 Status: Offline Points: 12 |
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XentriK Sound, which driver are you planning to use?
I am thinking about doing a lightweight 12 mm version like you, and with a neodymium driver. |
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XentriK Sound
Registered User Joined: 02 March 2017 Location: Devon Status: Offline Points: 17 |
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Oberton 12b450
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Devon Based Soundsystem.
https://www.facebook.com/XentriKSoundEvents/ |
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mobiele eenheid
Old Croc Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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I once made a similar cabinet out of 12 mm for 12V and up to a couple hundred Watts I wouldn't mind it at all. Once you crank it much over 500 W I would prefer using 15 mm. If you use bracing like the pic below, I would keep it as it is (personally would skip the holes in the bracing):
Best regards Johan |
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cookie-dj
Young Croc Joined: 09 May 2014 Location: Warwickshire Status: Offline Points: 977 |
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If you use PD drivers don't do what I did with the PD123C01 driver in mine. Allow an extra 3mm as its VERY tight in there. Literally had no space either side of mine.
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You can't polish a turd!
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SouthwestCNC
Young Croc Joined: 27 November 2015 Status: Offline Points: 830 |
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To make the area of each segment the same don't you need to make the box thinner to account for the thinner ply? bit tricky to go thinner as very tight already with the tham12.
Or I suppose you are just upscaling the throat slightly so the change wont be massive but that does require you to centre the 12mm parts over where there is 15mm in the plans for consistent scaling. Edited by SouthwestCNC - 25 May 2017 at 3:29pm |
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