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Forum: Pi Speakers
 Topic: Horn loaded Corona Build
Re: Horn loaded Corona Build [message #92014 is a reply to message #91945] Wed, 03 June 2020 14:32
dawiipgh is currently offline  dawiipgh
Messages: 7
Registered: May 2020
Esquire
A pair of JBL Woofers were just delivered today!

Off to Lowe's for some 3/4" baltic birch and wood glue.

I'm looking forward to covering the back porch in sawdust this weekend!
Re: Horn loaded Corona Build [message #92015 is a reply to message #92014] Wed, 03 June 2020 15:34
Rusty is currently offline  Rusty
Messages: 379
Registered: May 2018
Location: Kansas City Missouri
Illuminati (1st Degree)
I hope you haven't bought it yet. But I don't think Lowes carries true Baltic Birch ply. They have 4x8 sheets of birch ply. But it's not the same. It will have voids within the ply layers. As Wayne states many times. It can cause issues with trapped wood particles buzzing or rattling. If not immediate, then possibly later. Not sure if you knew about that. https://www.woodworkerssource.com/blog/woodworking-101/tips-tricks/your-ultimate-guide-to-baltic-birch-plywood-why-its-better-when-to-use-it/
This can be found at better lumberyards.
Re: Horn loaded Corona Build [message #92016 is a reply to message #92015] Wed, 03 June 2020 17:48
Wayne Parham is currently offline  Wayne Parham
Messages: 17783
Registered: January 2001
Illuminati (33rd Degree)

Awesome news you got your JBLs! But Rusty's right - Do check the quality of the wood. Lowe's is an excellent retailer, but the ones in Tulsa and Northwest Arkansas definitely do not carry Baltic Birch or even a good grade of MDF. They provide sheets of stuff that's probably good for some kinds of home projects and other similar structures like sheds, shops and garages. But it isn't suitable for loudspeaker enclosures.

Your local Lowe's might be different, but I doubt it. You can easily identify true Baltic Birch - It is sold in metric values of thickness, like 18mm. That's 0.7" which is pretty close to 3/4" and it will have 13 plys. What you'll probably find at Lowe's will be plywoods with much fewer plys than that, like 5. That's the sure indicator it's not Baltic Birch. Another way to tell is it's usually sold in 1.525M square sheets, which is 5' x 5'. It will also usually have a Cyrillic letter on it. Seems like all the sheets I've bought had an "F" (which looks like "ф") on the face somewhere.



Current Time: Wed Jun 03 20:32:49 CDT 2020

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