Quit listening to the Eagles! Are your speakers on spikes? Is the whole system sitting on carpet? There's lots you can do but without knowing the particulars it's hard to make suggestions. Try the Aurious.
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Here's a cheap isolator :
Get a block of concrete or a marble chopping board.
Place on top of 2-3 inches sheet of soft foam, or
inflated bike inner tube.
Place CD player on top of the concrete / marble.
Not perfect, but worked for my turntable, when I suffered from bass feedback, and only costs about $10.
If it works but it is visually offensive then replace with a high-cost audio isolation platform.