When used as riser support, PlatFoam Isolation Foam from Auralex greatly purifies the tone of whatever's on the riser and yields dramatically improved isolation characteristics, minimizing sound transmission to neighboring spaces. This is a fast, portable, easy and affordable solution to many sound isolation problems.
Made of proprietary, high density foam
Helps improve transmission loss up to 10dB at 60Hz
"Tightens" and increases sonic detail of sound sources, particularly low frequencies
Lightweight and requires no mechanical fasteners
Benign to existing flooring