Auralex Acoustics GRAMMA v2 Isolation Platform for Amplifiers, 7/4" x 15&rdquo; x 23&rdquo; A tighter, more focused low-end Hear the true sound of your amp, loudspeaker or subwoofer Instantly improve your sound on-stage or in the studio Lower Prole For Increased Stability Even Better Mid- & Low- Frequency Denition Weight Limit: 300lbs. 23 long x 15 wide x 1.75 high