3. Insert the tubes into the holes in the rack
cavity from below. Attach them by putting
back and tightening the nuts.
4. Guide the two tubes down on each side of
the center riser. Cut them at the appropriate
length, 5 mm (0.2 in.) above the ducts of the
subwoofer stand.
5. Fasten the tubes to the riser and bracket with
cable ties, in order to prevent the tubes from
touching the subwoofers and cause rattling
noise.
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