I would say the sources, pre-amp, speakers then the amp. Have fun.
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Don't start with the impossible. Attempting to 'isolate' vibration nearly as dramatic as attempting to paint the sky red. The term 'vibration isolation' is an oxymoron.
Sure you can put an air-bladder, tennis balls, sand, etc. under a component to isolate it to one extent or another from floor-borne vibrations. But now how do you address the air-borne and internally generated (electrical and mechanical) vibrations captured by your components?
And the big question is which of the 3 types (air-, floor-, or internally-generated) of vibration induce the most sonic harm?
If you answer that one incorrectly then it really doesn't matter what you do.
Mechanical devices (sources: TT, cdp, etc); these produce vibration as well as being sensitive to airborne & structural vibration.
Low-level signal processors (active pre, dac, phono, etc) that can be sensitive to external vibration. These devices may be sensitive to vibration -- but surely, in applying coupling or decoupling devices you will change their structural resonance and, hence, the sound somewhat.
Spkrs should be well /sturdily fixed.
Agon member Jadem is very well versed in this subject and is very helpful.
A friend of mine did a shoot out of sorts & you can read about it here
Like others have mentioned, the source is usually the best place to start but just assessing the room & placement of all your components should be the first step.