DAP non-flammable contact cement (what duracrest used - they made the grills for Klipsch). You can also use 3M77, or Duco (my preference) cement as well. You need to spray the front of the board with a tacky adhesive (or you can also use Elmers Glue - not the woodworking type, the white kind) to position the cloth square and tight when you do it. position, glue and clamp the first edge between two flat 1x2's with wax paper (to prevent the contact cement from cementing the clamp boards), turn the board over, then carefully and evenly pull the cloth across the front, press down to "stick it", and then fold over and glue the other side with the clamp things. Let it dry, inspect, and then do the top/bottom edges. Work with about 1/2" overhang, and cut out 90 degree notches so when the corners are folded over, the cloth is not "stacked". Hope that helps.
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