The Mackie 090-291-90 is a specialized rackmount kit designed to securely install Mackie 1642VLZ, VLZ3, and VLZ Pro series compact mixers into a standard 19-inch equipment rack. These mixers are renowned for their professional audio performance in a relatively small footprint, but their compact, standalone design does not inherently allow for rack mounting. This kit solves that problem by providing a sturdy, custom-fitted metal chassis that encloses the mixer, protecting it from dust and physical impact while integrating it seamlessly into a rack-based system. This is essential for permanent installations in recording studios, broadcast trucks, houses of worship, and touring racks where equipment needs to be consolidated, secured, and easily transportable.

The kit typically consists of two main rack ears or side panels that attach to the sides of the mixer, effectively extending its width to match the standard 19-inch rack width. It includes all necessary mounting screws and often features a supportive front rail or bracket to ensure the mixer is held securely at the correct depth within the rack. The design maintains full access to the mixer's top-panel controls, rear-panel inputs/outputs, and may include ventilation cutouts to ensure proper airflow for cooling. Installation is straightforward, requiring basic tools to attach the ears to the mixer and then mounting the entire assembly into the rack using standard rack screws.

By enabling rack mounting, this accessory transforms a high-quality desktop mixer into a professional rack-mountable component. This greatly enhances the mixer's utility in organized, multi-unit equipment setups, improving cable management, reducing setup time for touring crews, and providing a more protected and professional presentation. It exemplifies Mackie's commitment to offering flexible solutions that adapt their core products to the diverse needs of audio professionals in both fixed and mobile environments.