I work with Harmonic Resolution Systems (HRS) and I know the immediate thought will be expensive. Yes, there are solutions that cost a lot of money but there are also solutions form HRS that are less costly and designed to fit into any system. Since this discussion is about feet, I will keep my initial discussion to that section of the offerings. HRS offers a "Coupler" solution. This is much like the Sorbothane discussed here but made from a high grade specifically designed polymer for wide bandwidth audio frequency vibration absorption. It will not degrade over time and retails at $43 each. You only need 3 to start and you may need to remove the feet off the bottom of your component so it will rest on these instead of the factory feet. If you can’t or don’t want to remove the feet then there are Nimbus Assemblies which start at $130 each and are two Couplers separated by a billet quality aluminum spacer. The polymers are rated well beyond the heat requirements of an audio amplifier, and also will hold the weight without compressing significantly. Keep in mind that not all chassis want to be touched and may do the best resting on their own feet. That is where we deviate from feet alone and move to an Isolation Platform which starts at $1095 and is fully adjustable in the future so you can keep reusing the base when you change your component. The weight of the component is the first reason for changing the platform but also can include the internal noise generated by the component itself, the symmetry or asymmetry of the weight within the component, and other factors that are component-specific. These factors also include moving the system from a stiff floor to a more flexible floor. When changing sound rooms or houses.
Having introduced the idea here, I also want to note that anything that touches the chassis will affect the sound. If you wish to take a lot of time experimenting, have at it. HRS encourages exploration and ideas. As a salesperson, I always find that is a characteristic of an engineer who knows what the hell he is talking about, and can explain why myrtle blocks work, aluminum works, maple cutting boards work, etc. and also why he/she chooses the materials and technology they employ in their products.
Have fun with this part of your system. It is a vital part of the noise reduction in all audio systems.
Having introduced the idea here, I also want to note that anything that touches the chassis will affect the sound. If you wish to take a lot of time experimenting, have at it. HRS encourages exploration and ideas. As a salesperson, I always find that is a characteristic of an engineer who knows what the hell he is talking about, and can explain why myrtle blocks work, aluminum works, maple cutting boards work, etc. and also why he/she chooses the materials and technology they employ in their products.
Have fun with this part of your system. It is a vital part of the noise reduction in all audio systems.