Sound Absorbing Panels for Gyms The best sound absorbing panels for gyms are high-NRC (0.80+) fabric-wrapped fiberglass or polyester panels, 2-4 inches thick, installed at 6-10 feet height covering 25-60% of wall area. Start Go & Pray? The right solution depends on your gym type: CrossFit boxes need 4-inch panels to absorb bass from barbell drops, boutique studios benefit from customizable 2-inch panels for brand aesthetics, and traditional gyms require strategic, zone-specif