7 laminates ply birch instead of 13 laminates |
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heavydub
Registered User Joined: 07 October 2020 Status: Offline Points: 23 |
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Posted: 06 July 2021 at 11:30am |
I am building my first superscoop. Unfortunately my wood seller has only 7 laminates 18mm birch panels, instead of 13 laminates as suggested in the scooper plan. Will this make a huge difference? I am more scared about sound quality than build resistance.
I know 13 laminates wood is more dense. If 7 lam is not enougth, could I renforce the external structure with 2x 18mm panels (on both sides and behind) to give more density and better isolation?
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csg
Old Croc Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086 |
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Are you sure he is offering you Birch? I wouldn’t be surprised if you are being offered WBP hardwood ply, which is definitely not the same thing
But, stick with 13 laminate, solid void free birch. BB/BB grade is considered the gold standard, however you can save a bit if you only are showing one side by using BB/CP grade which will have one face that will have greater imperfections/ knots etc. that can easily be filled or hidden inside the cab. |
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heavydub
Registered User Joined: 07 October 2020 Status: Offline Points: 23 |
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I have news. Maybe I have the possibility to buy panels with this specs:
Birch 18mm 13 laminates BB/CP WBP Marine Do you think I can use this kind of wood to build the whole structure (internals and externals)? I probably can't find nothing better right now. I am not searching for the best solution. But I am searching for something that could work very nice.
Edited by heavydub - 06 July 2021 at 1:07pm |
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csg
Old Croc Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086 |
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That will be just fine, use the BB side on the outside obviously!…
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“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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heavydub
Registered User Joined: 07 October 2020 Status: Offline Points: 23 |
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Awesome! Just another question: what does the "marine" spec means?
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csg
Old Croc Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086 |
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Marine means that the ply is rated for maritime use, approved by Lloyds of london etc. WBP means that the ply should not delaminate when wet. You dont need or want marine ply for speakers.
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“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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heavydub
Registered User Joined: 07 October 2020 Status: Offline Points: 23 |
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I don't need or want, ok. But it can be used for speaker box builds without problems? I mean, mechanical resistance, sound quality, density. I've heard it's more difficoult to cut too.
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csg
Old Croc Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086 |
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Never used it for speakers, so i cant comment. I really would stick to the Birch, even if something else is slightly cheaper you will lose those savings bringing the finish up to the same standard as is quite easy with Birch
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“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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VECTORDJ
Young Croc Joined: 11 June 2006 Location: United States Status: Offline Points: 513 |
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7 Ply Birch is only Birch on the two outer layers....13 ply Birch is Birch every layer...Way better.
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JonB67
Young Croc Joined: 22 April 2016 Location: UK Status: Offline Points: 1376 |
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Birch is stiffer, more stable, more void free, easier to machine, easier to screw into, cleaner cutting....
The extra money is worth it twice over. |
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citizensc
Young Croc Joined: 16 October 2015 Location: Perth,Australia Status: Offline Points: 532 |
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When I first got in to sound system stuff, people gave me the advice that I should just use birch. I thought it wouldn't be as important for my tops, I built them out of cheaper ply as I was on a tight budget. Within a year, they were turned in to plant pots and I had rebuilt them out of birch. I didn't save money, I wasted money and time. Honestly just use 13 laminate birch, you will not regret it!
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heavydub
Registered User Joined: 07 October 2020 Status: Offline Points: 23 |
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Thank you everybody.
I've found new panels today. Birch BB/BB quality 18mm 13 laminates phenolic Everything looks good, but I am not sure that phenolic ply is ok. The seller told me that the wood is absolutely birch, the quality is the same as a non-phenolic panel. The only difference is in the glue used to attach each laminate. I guess and I hope that this will be just good to build boxes. What do you guy think? I've searched in the forum info about phenolic birch but I can't find nothing special. Maybe (but I am not sure) using phenolic birch instead of non-phenolic ply could be better because box should better resist to humidity too?? But again, I don't know. I just hope this wood is ok for scoop building. |
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