This single additional modular bracket layer is designed for customers who already own the DOWN4SOUND EZY Rack Stack Base Unit and need an extra amplifier layer or a replacement bracket. Important Notes: This listing is for ONE amplifier layer (4 brackets, one per corner). A base unit is REQUIRED for installation. This cannot be used alone. Ideal for expanding your stack or replacing a damaged bracket. Key Features: Seamless Expansion: Easily add another amplifier to your EZY Rack Stack. Heavy-Duty Construction: Made from 6101 aluminum for maximum strength and durability. Secure Fit: Includes 4 corner brackets to ensure proper amplifier mounting. Stacking Hardware Provided: Comes with 12 nuts and 12 bolts for secure attachment. User-Supplied Hardware Needed: Customers must provide their own nuts, bolts, and washers to mount amplifiers to the brackets. Specifications: Total Stack Height Per Layer: 3.75” Weight Capacity (50% Safety Factor): 75 lbs per amplifier row LED Strip Ready: Channels built in for user-supplied LED strips (not included).