1/2” birch ply sufficient for box build?


hispls

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I sure wish I seen even a cent of the stimulus package lol
You must be one of those suckers that actually works, saves, and invests.
Just buy the 13 ply Baltic Birch. The peace of mind is worth the extra money. IMHO!
Psychosomatic benefits could be said to be priceless.

Now I defy you to show some data which would support the idea that 3/4" meme plywood would outperform 3/4" sanded pine (with or without """cabinet grade""" veneer), 3/4" MDF, 3/4" OSB, or even 3/4" particle board by any significant metric for OP's application. You'll be harder pressed to even imply any benefit whatsoever which could not be more cheaply achieved through other methods used with one of the less expensive alternative lumber types in ANY application.
 

Buck

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How much volume are you really saving by the time you build up your fiberglass enough to add strength? Do you suppose that would make an audible difference?

Ouch. Lumber has at least doubled this past year across the board. But at least everybody is getting """free""" money to not work.
I know man it kills me. What a scam all of this is.
 

Bobbytwonames

Angry Old Man
Aug 28, 2018
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You must be one of those suckers that actually works, saves, and invests.

Psychosomatic benefits could be said to be priceless.

Now I defy you to show some data which would support the idea that 3/4" meme plywood would outperform 3/4" sanded pine (with or without """cabinet grade""" veneer), 3/4" MDF, 3/4" OSB, or even 3/4" particle board by any significant metric for OP's application. You'll be harder pressed to even imply any benefit whatsoever which could not be more cheaply achieved through other methods used with one of the less expensive alternative lumber types in ANY application.
I'm not familiar with the pine, but I will take @Popwarhomie word for it. There are different grades and densities of ¾" MDF, that I've seen for myself. The 5 or 6 layer Baltic Birch warps like a biitch. The 13 layer Russian Baltic is a much better and stronger product for a subwoofer box. I buy my lumber for subwoofer boxes from a local lumber salesman. He carries high end grades of Birch and MDF, both ¾" and 1". I would steer clear of buying subwoofer box material from Home Depot or Lowe's. Except, maybe the pine that Pop uses. The OP could use ¾" Birch, MDF, or Pine.
 

West1

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I looked at the local Lowe’s for 3/4 sanded pine, they only sell 4x4 sheets.

ill have to call around and see what’s available from lumberyards, the only problem is they are usually pricy :/

Looking at HD, is this a good wood?
https://www.homedepot.com/p/Swaner-Hardwood-Prefinished-Birch-Plywood-Common-3-4-in-x-4-ft-x-8-ft-Actual-0-703-in-x-48-in-x-96-in-971080/203005208

What I dislike about lumberyards is they don’t cut it and putting in a 4x8 sheet into a Tahoe has scuffed the interior... that bothers me. If they would cut it so it’s not 4’ wide, I’ll do that all day.

at least with Lowe’s/HD, I can get it chopped up pretty close and square off any cuts I need to make/correct.

#firstworldproblems
 
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Bobbytwonames

Angry Old Man
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I looked at the local Lowe’s for 3/4 sanded pine, they only sell 4x4 sheets.

ill have to call around and see what’s available from lumberyards, the only problem is they are usually pricy :/
In Vegas, you can get the good 1" MDF for $63 per 4' x 10' sheet. Just look for some good ¾" MDF and run with it. I'm running a single layer ¾" MDF in a 3,000 watt box that is sufficiently braced.
 

West1

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In Vegas, you can get the good 1" MDF for $63 per 4' x 10' sheet. Just look for some good ¾" MDF and run with it. I'm running a single layer ¾" MDF in a 3,000 watt box that is sufficiently braced.
Wow.
what’s considered “good MDF”, any High Density MDF?
aside from cuts, do you have to paint or epoxy/etc the MDF for structural strength or use as is?
 
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LsGuy

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Sep 11, 2020
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Wow.
what’s considered “good MDF”, any High Density MDF?
aside from cuts, do you have to paint or epoxy/etc the MDF for structural strength or use as is?
Mdf is just mdf. You don't need to paint it for strength, but make sure it doesn't get wet.
 

hispls

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I buy my lumber for subwoofer boxes from a local lumber salesman.
Well certainly someone who is impartial as to how much money you spend. Show me some hard data from real-world measurements of what difference we can expect from taking your advice. Once you quantify the performance difference than everybody can judge whether or not the extra money is worth the improvement in real world utility.
Looking at HD, is this a good wood?
I have used that or similar from the big box stores with good results.
So show us some Termlab or RTA measurements illustrating the difference we can expect to see depending on which type of MDF we use.
 

LsGuy

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Sep 11, 2020
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That's a big list of binders, can you show me an ingredient list that shows the difference between binders used by home depot and these luxury lumber yards?

I don't care about color or texture as mdf is ugly. But HD mdf is glass smoth. It's heavy and dense. If you want the most dense possible pour a concrete box....
 

Bobbytwonames

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Well certainly someone who is impartial as to how much money you spend. Show me some hard data from real-world measurements of what difference we can expect from taking your advice. Once you quantify the performance difference than everybody can judge whether or not the extra money is worth the improvement in real world utility.

I have used that or similar from the big box stores with good results.

So show us some Termlab or RTA measurements illustrating the difference we can expect to see depending on which type of MDF we use.
That's like you saying all Birch is the same, or, all 2'x4"'s are the same, they aren't. Obviously, the denser the MDF, the better. Some MDF will even start flaking off in layers. Buy whatever you want, just know that all MDF's aren't created equal.
 

Bobbytwonames

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Aug 28, 2018
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That's a big list of binders, can you show me an ingredient list that shows the difference between binders used by home depot and these luxury lumber yards?

I don't care about color or texture as mdf is ugly. But HD mdf is glass smoth. It's heavy and dense. If you want the most dense possible pour a concrete box....
O.k., believe what you want. Just sayin.

Screenshot_20210218-181724_Google.jpg
 

hispls

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That's like you saying all Birch is the same, or, all 2'x4"'s are the same,
I did not say that. I asked you to provide data to show us how these different types of lumber will effect performance. Since you have not we can safely assume you cannot and are once again just talking out your arse.
 

Bobbytwonames

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I did not say that. I asked you to provide data to show us how these different types of lumber will effect performance. Since you have not we can safely assume you cannot and are once again just talking out your arse.
Use whatever type of MDF that you want to. Just know that they aren't all the same. It's common sense that the denser the MDF, then, it will be stronger and have less flex. But, like I said, use what you want.
 

2RZ-FE

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You shouldn't flex any wood with proper baffle thickness and bracing for whatever power you have. I do a 1.5" baffle at the minimum not counting a flush panel as I like to have more than 3/4" to screw the subs to.

3/4" walls are efficient for my SA 12. If I had a U series I would do three layer baffle and 1" walls minimum.
 

hispls

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It's common sense
So how much measured output or distortion does that translate into in dB SPL? Can we see the test data that you or someone else collected to get this information?

Just admit you're talking out your arse and don't have one bit of evidence to support your claim.
 

Bobbytwonames

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Aug 28, 2018
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Vegas
So how much measured output or distortion does that translate into in dB SPL? Can we see the test data that you or someone else collected to get this information?

Just admit you're talking out your arse and don't have one bit of evidence to support your claim.
You just keep buying the low grade MDF. My lumber told me today that he carries about 7 different grades of MDF. Denser = stiffer = less flex. I don't have time to do all of this testing that you are talking about. It's common sense. We het the best grade ¾" MDF for $34 a sheet.
 

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