VIB 170 AL
The cabinet consists of 19 mm medium density fibreboard (MDF) or chipboard, stuck together as butt joints. Inside the speaker there are three reinforcing boards to prevent the cabinet resonating. Since the bass reflextube can no longer be inserted through the bass speaker cut-out, due to the cabinet reinforcement, the base of the speaker is removable. To this end, a base and a frame mount are required. The frame is best manufactured from a board exactly the same size as the cross-sectional size of the cabinet, and with a cut-out in it. The base itself is exactly 1 mm smaller all round than the frame to enable it to be inserted with ease.