warped plywood

[jesuchete]

I just managed four of the last arouco sheets from Lowes and they are warped. I got in looked at the price it has gone up to $36 from $26 however they left the $25 sticker on there and that what I used. However the wood is all over the place and my speaker cab front is square but you can see warped baffles and so on.
How do I remedy this?

[Bill Fitzmaurice]

How do I remedy this?

Follow the plans, the construction techniques shown will pull the warp out.

[Gregory East]

Petrol and a match I think, too late for completed cab.

[LelandCrooks]

Clamps, clamps, clamps, clamps, cauls and more cauls. And the techniques Bill describes in the plans.