We recommend using good quality plywood or medium density fibreboard (MDF) for the cabinet. If the speaker is to be moved often, we strongly recommend heavy-duty plywood or multilayer board. Recessed handles and reinforcing corners for stacking (available from good music supplies shops) are of great assistance for frequent moves. The drawing shows a 50-mm cut-out in the rear wall for a PT 57 NG terminal block. You will have to adjust the dimensions of this cut-out if you use other connectors, such as XLR's or jacks.
The 5 bags of damping material are distributed in such a way that only the area behind both bass reflex tubes remains free.