JBL ACK1 Universal Accessory Caster Kit Compatible w/ SRX918S and SRX928S

The JBL ACK1 is a universal caster kit that turns a compatible JBL cabinet into a rolling load. It ships with four tour-grade casters and the hardware needed to bolt them to the enclosure, and it is designed for the SRX918S and SRX928S subwoofers.

Each caster carries a 100 kg (220 lb) rating, so a set of four supports 880 lb in total, well past the loaded weight of the subwoofers it fits. The wheels are black polyurethane, a material that rolls quietly over concrete, rolls across cable ramps and door thresholds without gouging, and resists flat-spotting when a cabinet sits in storage between shows.

Housings are high-grade steel with an anti-corrosion coating and a black powder coat finish. The all-black look matters in cardioid subwoofer stacks and other setups where the rear of the cabinet faces the audience, since nothing bright catches a light cue. Anti-rattle features in the swivel and mount keep the assembly quiet under high output, so the casters do not add buzz to a loud low-frequency passage.

Each caster measures 4.5 x 2.5 x 4.1 in and the kit weighs 6.9 lb. For crews loading in and out on a schedule, casters remove the two-person lift from every move: one tech can walk a subwoofer from the truck to stage position. Refer to the product Rigging and User Manuals for attachment details.