Wood confusion

Hi!

Im going to build some of my own speakers.
The obvious choice of wood to use is Birch ply so I've been getting a few quotes from different places.
The cheapest i could find was this..

www.jewson.co.uk/timber/sheet-materials/...2440-x-1220-x-180mm/

Will the spruce core make a different to the build/sound quality.
Also it appears to have less layers than other types of ply i have viewed (which look to be the best i could get) e.g

www.travisperkins.co.uk/p/birch-plywood-...m-fsc/405018/3893617


Could some one give me some advice or alternatively link me to somewhere cheaper/better?
Any help is appreciated,
Cheers!

For the best results using Ply, you really need to use void-free Birch Ply.

Now from memory, this should be 13 laminate and 'BB' grade (haven't done any Cab building for a few years).
Anyone else reading this please correct this specification if I've got it wrong!

Now, this material is more expensive than the Spruce laminated material which you are asking about, but the Birch 13 laminate version has greater density so it works better in reducing panel resonances for 'Speaker cabs.

You also don't give your location other than Somerset; so advising on a supplier which may be fairly local to you is rather difficult, but you could try Avon Plywood in Keynsham: avonplywood.co.uk/
They also do CNC cutting which may be of use to you.

hope this assists
Mik

As mic said Baltic birch ply, 13 laminates, bb grade or a if you can get it.

Thanks for the advice guys!

On the avonplywood website i have found these two types of ply

1. Birch Plywood WBP B/BB Grade (Clear 1 Side - Plugs on Reverse)
2. Birch Plywood WBP BB/BB Grade (Veneer Plugs 2 sides)

Could either of you tell me what they are referring to when they say plugs/veneer plugs and how this might affect the sound?
Also, what difference would it make it it was not 13 laminate?

Apology's for my ignorance, i am completely new to this..


Cheers

wbp, is a cheap ply, qbp stands for Water Boiled Proofing this is in reference to the glue used to glue each laminate together, wbp normally has a very ruff finish.

Plugs are wear the tree has a knot in it, this is stamped out and a plug put in its place. Left along the knot falls out creating a void in that layer....

What they are saying is one side has plugs so it has no voids on the outside layer (vaneer).
the other has plugs on both sides outside layer (vaneers).

Both will have no plugs on internal layers (vaneers), i.e. defo not void free....

The grading refers to the number of voids, bb has no voids but minimal plugs. why they refer it a b/bb grade is its a good quality wbp ply commonly full of voids, but defo not a good as Baltic birch ply bb grade....

worth a read of this thread, some good info that may help...

www.freespeakerplans.com/kunena/41-pa-fo...ut-plywood-materials