Lenco TBS-5001 - Manual (Page 39)

Assembly
1. Slightly put the main box on the both of subwoofer boxes, and lock the metal stand
on the subwoofer.then lock the back panel
2. Connect the main box with the subwoofer boxes by holes and straps.
3. push the main box ahead to fasten.
4. Put the glass plate onto the screws.