Supplied equipment feet or cones ,etc?

Same as above for myself, except that I evolved to Mod Squad Soft Shoes, designed and manufactured by Steve McCormack when he was "The Mod Squad."

After all these years, even though my system is very high end now, I still prefer the Soft Shoes under most of my equipment.

They have won over all the spikes and cones that I have tried, and that includes most of the brands discussed here.

I use Vibrapods wherever i can. They work great and don't seem to have a negative effect.They are quiet and seem to hold the equipment well. They are also very cheap! Good luck

I've too tried most of the cone products on my Levinson gear. It all seemed to color the sound. I've found the Vibrapods to be one of the best and cheapest tweaks and you don't have to worry about them turning over in a child quake.
Good listening!
Sgr

Replace your stock feet with EAR, they screw in just like your OEM feet and I really like the subtle change in sound. Slightly less edge, little more PRAT.

Some care should always be taken when replacing the component manufacturer's stock supplied feet.
IME, while many manufacturers don't always select their chosen feet very carefully for maximum isolation benefits ,they nonetheless voice those components using them and thus swapping footers can easily undermine musical properties that the manufacturer designed into the product.
Regardless, often aftermarket footers can be very effective tools for fine tuning for component,system and individual requirements.
I find that most elastomer devices have a negative impact on pace,dynamics and timing.In addition, the benefits of using elastomerics is very component specific. To my ears, the detriments more often than not, outweigh their usefullness.On the occassions that a damping device is required or beneficial,my experience has been that the most consistantly effective of these have been the EAR footers.
I consider most cone devices to be mechanical filters that produce specific tonal emphasis or sonic effects.The shape of a cone is one of the major determinants of the narrowness of the bandwidths that are enhanced.Straight sided and steep cones will have the most narrow frequency related characteristics.Non-linear,curved sided cones tend to have a broader,more even balance.
Of all the cone type devices I have experience with, the most widely effective,PRaT friendly, broadband cone footer has been the "Jumbo" cones from DH Labs.I recommend them highly.