Why would you need isolation for a headphone rig? You live in a construction site trailer? Share the listening space with a Flamenco dance school? Digital jitter is actual jitter? Listen to headphones REALLY REALLY loud? Lots of pesky seismic tremors? Train goes by 10 feet from the window like in a Blues Brothers movie? Listening space in the bilge of a Niagara Falls tour boat? That's all I've got for now...need answers...