Thanks guys.....depends on how big the system is.
meaning if you have nasty bass then do 3/4 .
but 1/2 sound be good.
im using 3/4 for my amp rack.
also i would not use mdf.
Depends upon power he's running tho...it dosnt have to be mdf, but it can be less than 3/4 like 1/2
hes right.Mine is 3/4 MDF. My amps are somewhat heavy tho.
He wouldn't use mdf my guess would be weight. Birch plywood would be ideal much lighter and stronger than MDF.....and much less sawdust.