Sorry for that bit of confusion.
The material to be used was stated and not a point I wanted to bring up for
discussion.
I've had enough discussions about what material for which speaker purpose to
last a life-time.
HOWEVER - now that it's been brought up - I'd like to ask if the material
sold as "Betonplex" over here - essentially waterproofed ply with a non-slip
surface is easy enough to glue or should I remove the surfacing if I take
that route with a router?
Thanks.
cb