ZETHUS-212FF SUSPENSION FLYING FRAME: Elevate your space using the ZETHUS-212FF flying frame, designed for the ZETHUS-212LMH 3-way line array loudspeakers. Whether it's for permanent installations or mobile setups, effortlessly suspend your ZETHUS-212LMH line array speakers for a more immersive audio experience MULTI-FUNCTIONAL DESIGN: Easily transform the ZETHUS-212FF flying frame to a caster transport frame using the included casters and accessories, safely transport your audio system or utilize them as a mobile ground stack set up. STACK ADAPTER: The ZETHUS-212FF flying frame goes beyond its primary function by seamlessly serving as a stack adapter between the ZETHUS-218S subwoofer and ZETHUS-212LMH loudspeaker. This innovative feature empowers you to effortlessly ground stack up to four ZETHUS-212LMH line array PA speakers on a single ZETHUS-218S sub, optimizing your setup for enhanced audio performance and versatility.