read something interesting recently,had to do with taming all internal/external problems.
First off,you need to sart out with a rigid platform,a well built flexi should be enough i think..
Next up is a platform comprised of dissimiliar materials performing multi-functions.Layer of say 1" wood/layer of absorbant material such as closed cell foam bonded to the wood/and another 1" thick layer of wood on top ,also boded.
Then you add some cone feet in a group of three on the bottom point down to couple to the rigid shelf.Another trio of cones are placed point up to couple the CD player or other device to the new platform.Sounds like a melding of all the pros and cons of spikes/or pods.
A DIY solution should not be too hard to implement
What would the rickster do ? I have a thought to make a mini-isolation-platform for a portable cd player using a similiar but different model.How about a couple of those steel plates from home depot that are used to cover an electrical junction box,about 5X5 in size and painted black.
Between them glue a nice thick mousepad (trim the edges once dry) and then use the smallest tip toes .Put the PCDP on this and finish off with some added "mass" to the top of the CDP,a small sandbag,brass weight,whatever you can use without collapsing the lid.
Then again,maybe i am crazy