Pend there are a thousand opinions on this issue: My own results with inner tubes were not good at all, but it won't hurt to try it. Good results were achieved with a Black Diamond shelf sitting on Vibrapods. Cones are then placed under the CDP in between the BD shelf; BD #4 cones are presently installed, but sometimes the BD #3's or even brass Audio Point cones with saucers are better, depending upon the downline setup in use at the time. Similar setup is under power amp , tuner & preamp, but these are better without cones in my rig (yours will be different of course).
However I found that those glass doors are awful & it all sounds much better with them removed. This was true whether the doors were closed or left standing open
However I found that those glass doors are awful & it all sounds much better with them removed. This was true whether the doors were closed or left standing open