yes,.......and yes. but it's not that simple.
i have darTZeel mono block amplifiers that have build quality rivaling a swiss watch. and their power supplies are suspended inside the case work. there are transport screws to hold the circuits firmly that must be removed once set in place so the suspension can work. arguably the best sounding solid state amplification out there at any price. amazing performance. 18 months ago i tried -2- Taiko Tana active systems under these amps. since they have such a solid construction and are already using designed-in suspended circuitry you might expect that there is not much farther to go.
https://taikoaudio.com/products/taiko-audio-tana/
but there is a noticeable improvement in musical focus and sound-stage life and removal of a level of distortion with these active Tana systems in place. especially piano and violin precision takes on another degree of realism. i can turn them on and off with one push of a button and it's easy to hear the effect as the sound stage relatively collapses.
i have three more of these active Taiko Tana systems used in my signal path. they are awesome but can't work everywhere. some turntables project resonance noise of their own which these Tana systems read as resonance and so a feedback loop gets set up and will eventually burn out the Tana. so they can only be used where the gear does not have self resonance.
i have (but not currently) used the active Tana system under my MSB dac box which is made from solid billet; and it had the same positive musical effect.
the Tana systems are crazy expensive, and i don't recommend them to many. if you have done everything you can to move the needle, and you are wanting to find another level; the Tana is that other level.
besides the active Tana systems i also use the passive Taiko Daiza anti-resonance platforms under the rest of my signal path; in fact i use -2- Daiza's stacked one on top of another.
https://taikoaudio.com/product/daiza/
the Daiza shelf is made of Panzerholtz, and then uses foam and copper spacers and panzerholtz footers to all act as layers of different impedance breaks to attenuate resonance in a broad frequency range. it's very neutral and retains energy and does not over-damp. all three of my MSB Select II boxes that are all solid billet sit on a double layer of these shelves and the performance advantage is considerable. and these shelves are reasonable in price (similar to a single Center Stage footer).
pictures in the Audiogon system picture link in my signature below.
why does all this stuff work?
because your gear sings along with the music. and it combines that 'noise' with the natural ground and outside noise already coming through your rack and floor and veils the music, smears detail, and blunts dynamics. robs the music of life, vividness and presence. the emotional pull of the music and flow is reduced. we are less attracted to listening. it does not matter how well constructed your gear is or whether your gear has it's own suspension. and the better and more detailed and accurate our systems become, the more we will be able to hear the benefit of resonance isolation.
sometimes gear and our ears like the effect of resonance. if your system is edgy or harsh, a colored upper bass, lower mid range might be preferred. no doubt reducing resonance will clear up that lower mids, upper bass warmth. one size does not fit all. but.......if you are chasing the ultimate in musical truth then you want to get the system out of the way of the music. coloration is just a band aid robbing you of information. if your system can't handle the clarity of the truth; then find the problem and fix it. don't color over it. maybe/probably it's a room tuning thing. if you are interested in resonance control, the room tuning is a similar area of opportunity. good luck with that.
any passive device is system dependent; it's a matter of context. until you hear it in your system you cannot 100% predict the outcome.
one last note; your floor and rack are limits to what approach will work with resonance/isolation control approaches. if you have a suspended wood floor, or a rack that is not solid; then you have some challenges to overcome those things before you try and choose a footer or platform. anything you use will be unpredictably combined with that floor or rack 'action'. just a caution.....first things first.
you will never know what you are missing until you take away the ambient, floor born and feedback resonance.
opcorn:
n the first one with stillpoints.