As guitar speakers are different so their cabinets are different.
Build your own 4x12 guitar cabinet.
Cut two pieces to 14 by 30 inches for the top bottom and two pieces 14 by 28 for the two sides of the cabinet.
The box design is acoustically less critical than that for hi fi or pa systems but proper construction is essential.
Cut two pieces of plywood or mdf to 28 inches by 28 inches for the front and back of the 4x12 cabinet.
April 3 2014 this handbook covers all the major kinds of cab types you re likely to want to try and build from horn loaded subwoofers to 4x12 guitar cabs along with advice on dimensions fixings materials and.