IsoAcoustics Aperta Subwoofer XL Isolation Platform, EachAperta SUB XL Measuring 14. 5 wide x 16 deep (368x406mm) the new Aperta Sub Stand XL brings the patented IsoAcoustics isolation technology to larger subwoofers of up to 160 lbs 72. 5 kg. Taming the power of such mighty speakers is no easy feat, but IsoAcoustics managed to build on the design of the Aperta Sub Stand for smaller subwoofers to perfectly support heavier models. About the Aperta SUB Series Subwoofer Isolation Elevate your audio experience