Be careful as besides the isolation aspects, you're also putting a weight on top of a piece of equipment which often has as obvious audible effect (which may improve or deteriorate your system's performance).
Advice on stacking equipment
In a possible space saving and redisplaying exercise Im thinking of stacking my line stage ( see system for details) on top of my cd player.To be honest I'm in two minds regarding the audible benefits of isolating/coupling equipment. But like most of us I I've bought over the years a number of aftermarket accessories in the pursuit of improved performance . At present I have a 1" thick sheet of black delrin under my klyne pre. one set of black diamond cones and 3 DH squares under my cd player along with some (12) small medium hard rubber like feet brought and recommended to me in by a high end dealer in England in the early 90s . I'm wondering what other members have used with good results when having to stacked equipment. Or is it always a bad idea? Thanks.