Transit covers, wheelboards and stacking hardware for Martin Audio and NEXO subwoofers. The Martin Audio SXTC218 is a padded transit cover cut for the SX218 and SXP218 double-18s, protecting paint and grilles in vans that also carry truss and staging. NEXO’s LNTWB15 wheelboard attaches to the front eyelets of the L15 subwoofer so the cabinet travels face down with its grille protected, and it doubles as a shallow dolly in the truck pack and keeps the bottom cabinet clean when subs live stacked in storage. The Martin Audio GSRIG1530 ground stack bracket mounts to SX subwoofers fitted with an M20 pole mount and carries up to three TORUS T12 cabinets, with downward aim adjustable between 15 and 30 degrees, secured through a single-point M20 handwheel fixing rather than boxes balanced on rubber feet.

Fit is everything here: these are model-specific parts, so check the exact cabinet designation before ordering, including powered versus passive variants where they share a shell. Ground stack hardware matters most on shows without flying points, keeping tops aligned, angled and secure on stacked subs. Wheelboards earn their keep the first time a double-18 has to cross a car park. If you are speccing a new rig, add covers and boards at the same time; it is cheaper than retrofitting after the first scuffed cabinet.