Try a 3-5lb. sandbag on top of the transport. I fill a gallon freezer bag one third with sand, then roll up the excess, seal and packing tape the sealed end. you should have a "sausage" shaped sandbag which you can try in different directions on top of the player. While your at it make bags for your preamp and amps too. If you want more isolation try 12" tire innertubes under the weighted components. One note: Cones and spikes are for coupling speakers to the floor, not for isolating front-end components or amps.(End sermon) I have found weight to be a great vibration damping solution. Expect better detail, smoother presentaion, more space(air)around instruments, less noise, tightening and more inner detail at the extensions.
If you like Jimmy Smith get hold of Jimmy Smith & Wes Montgomery Jimmy & Wes The Dynamic Duo on Verve, it's playing as I write and it's a great recording! Enjoy!