Hi Valelio,

All Axioms are constructed of 3/4-inch MDF (medium density fiberboard) so you can use 3/4-in or shorter wood screws. Don't put the screws closer than a couple of inches to the inset receptacle with the binding posts, so you don't damage any crossover components. It doesn't matter if the screw goes through the back panel because it will self-seal.

Regards,

Alan Lofft,
Axiom Resident Expert (Retired)