Cabinets are rarely made of wood....MDF is a good damped cheap material.
Contrary to popular belief - good heavy and heavily damped cabinets with bracing add almost no audible effect on the sound - apart from the acoustic suspension from the enclosed volume of air which does affect the driver damping and affects the driver selection.
Common cause of this popular belief - cheap light weight speakers with cabinets that "waffle" and do indeed affect the sound.
Contrary to popular belief - good heavy and heavily damped cabinets with bracing add almost no audible effect on the sound - apart from the acoustic suspension from the enclosed volume of air which does affect the driver damping and affects the driver selection.
Common cause of this popular belief - cheap light weight speakers with cabinets that "waffle" and do indeed affect the sound.