Cable isolators ???

i went to the local farm supply store and got ceramic insulators for rigging electric fences. They are about 1.5 in dia with a grove in the side to hold the cables. They seemed to have an effect in cleaning up the high end some as i remember. I doubt they are more than $5 or$10 a dozen. Haven't used them for years since the twins discovered they made decent projectiles.

cleaning up cord runs is very helpful.

Yes, they work to isolate speaker cables from electrostatic charges from carpets. Never used them on interconnects. Do yourself a favor and purchase vintage porcelain insulators - the kind used on electrical power poles - from Ebay (or your local Antique Collectible store) for about $5 apiece instead of the overpriced audiophile version which is esentially the same thing. As to interconnects, I've found cheap foam water pipe insulators from Home Depot - about $3. for a 4'piece - to be effective at separating the interconnects from other cables.

I've had luck using 3 wooden dowels in a "teepee" configuration to get one set of cables away from the others (signal vs power).

I was doubtful about vibration having an effect on electronics, much less wires. Rather than argue about it, I put a high gain circuit (phono preamp) into a box along with a small speaker system and a SPL meter. Ran the SPL up to about 110dB, and looked for any change of the preamp output. Nothing.

I think that vibration isolation is for turntables, where the pickup is expressly designed to respond to tiny vibrations. Elsewhere in the system, do it if it makes you feel good.

The foam is a good bet. All that ceramic stuff gets you no better results.