Has anyone had experiences good or bad with speaker isolation or isolation in general ?

Thanks, guys. If we can take a brief moment to get away from the springs, my bouncy floor can cause foot falls that can cause my rack to slightly wobble. If I throw a party, forget about it!

Without moving the rack, I want to tie the top rear outside corners of the top shelf to the front wall behind the rack. So, hard maple 2x4" rail across wall directly behind top shelf with maple 1x2" boards connecting the top shelf corners to the rail. BTW, maple because it matches my rack. My isolation/non-isolation question is, should I use any damping material where the 1x2" members are connected to the rail on the wall and top shelf? I was checking out Acoustical Solutions isolation pad that you can cut into individual 2x2" squares. They are a 3/4" sandwich of rubber- cork-rubber.

The more general question is, do I want to limit vibrations from the wall coming into the rack due to the direct connection, or do I want to isolate those vibrations? I have heard both opinions.
Kenny

Obviously, springs were a popular topic. Ha!

@kennythekey my first guess would be to rigidly mount it to the wall. But that’s just a guess without having any experience of how wiggly your wall is, etc..

In general, I’ve had the best success with a rigid rack and a floating platform for my turnable on that. But since your floor is bouncy, it would make the most sense to try and tie as rigidly as possible to the wall and use isolation under the rack legs, since that is where the problem is.

I think putting foam between the wall coupling would only reduce the effectiveness of tying into the wall.

Incidentally, will pieces of 1x2 be strong enough to be effective? Again, not sure how heavy your rack is, so they may be more than adequate. They certainly would not be on mine!

Thanks, toddveronne. The title of this post included general isolation, so why I threw my rack into the mix.

The wall is a bearing wall that sits on the foundation wall, so it's not wiggly! The rack can only rock forwards and backwards, so much more stable side-to-side. If I stomp/jump in front of it, I can get the stylus to skip. Otherwise, not a problem, so it's a safety issue.

The 1x2" pieces will be rigid if I directly tie them into the 2x4" rail across the wall. Another A-gon  member recommended this over dampening material in-between, but my dealer suggested the dampening. The positioning of the 2x4" changes if I use/don't use the dampening, so I'm trying to avoid a re-do. When playing music, if I put my hand on the wall, I can feel the vibrations, so do I want the vibrations transferring to my rack or not is the question? It seems, that a small consensus so far supports the direct approach, and to solve vibration issues by isolating the components, instead.
Kenny

kennythekey
The wall is a bearing wall that sits on the foundation wall, so it’s not wiggly! The rack can only rock forwards and backwards, so much more stable side-to-side. If I stomp/jump in front of it, I can get the stylus to skip. Otherwise, not a problem, so it’s a safety issue.

As fate would have it it’s not only floors that are the problem but also walls and ceilings, they all transmit seismic type vibrations. Unsuspended floors might be more problematic, what with trampoline effect and greater susceptibility to seismic type vibrations, including footfall and mechanical feedback, but even cement slabs and bearing walls on rigid foundations are moving, just not with the same amplitude usually. In areas like Las Vegas where there is rather strong Earth motion you can feel the vibration on the walls with the palm of your hand. Most places you can’t feel it with your hand but it’s there, especially the very low frequency stuff, the stuff below 10 Hertz. That’s because the entire building is being moved and shaken by the Earth’s crust motion and anything else around like wind or traffic or subways. And it’s being shaken and moved in 6 different directions due to the way physical seismic waves travel along the surface of the Earth. Thus, the house is moving up and down, to and fro, back no forth as well as twisted, etc. Most of the energy of the Earth crust motion is down around 0 to 3 Hz, but there is still a lot up to 20 Hz and above. This of course means that in order to escape at least some of the seismic type vibration one needs to decouple from the physical surroundings entirely, including walls. Furthermore the effects of seismic type vibration don’t necessarily manifest themselves overtly, e.g., needle jumping from the groove, it can be more subtle and insidious. You don’t know what you got til it’s gone, like the song says.

hi geoff
your posts make for very in interesting reading, you very clearly understand isolation from all angles,
I had great improvements when placing my speakers on the seismic podiums, which as you pointed out are a product using springs,
The feet on my speakers are just thin plain discs,
Do you think or could you tell me by replacing these standard feet with larger Clearlight Audio RDC isolation cones size 1.2, would i be in for another level of sound improvements,
I use Seismic Isolation Podiums under my speakers and Seismic Isolation platforms with the rdc cones under all my electronics and mains block.
I am now experimenting with Shun Mook Mpingo Discs in various places, which i am enjoying and hearing different effects, thanks for making me aware of these,
When i remove the mpingo discs i can say with certainty i prefer the sound with them included in the system,
Its quite difficult to explain the improvements they bring, if pushed i would say realism across the board ie bass is better, instruments are clearly defined and vocals gain a human like texture, im not saying the sytem is lacking without the mpingo discs, but definitely improves with them,
I have also tried Final Duramas a bearing type isolation on top of the seismic isolation platforms, which brings tighter bass with more detailed mid and top end,
Over all i am having a great time trying different isolation types but im learning mixing springs with cones or bearings is bringing gains over just using either one, 
But no matter what i use springs with cones or springs with bearings the mpingo discs adds more flavor either way,
I am giving it all a good go, its finding the best places for the mpingo discs which is bringing the most fun, at the moment i have one on the main plug at my wall socket  that feeds my mains block, the other is facing down on my rcas that are coming out my cdp, badge towards equipment dot facing down at 6 oclock,
i have ordered more mpingo discs as they bring a nice flavor to my system, i am hoping to leave the 2 placed where i have already got them, and place the new 2 on my speaker terminals the same as positioned on my rcas,
I would like to place the mpingos on my equipment and speakers, and use the magic crystal products you sell on my speaker terminals and all other equipment connection points i can then find new homes for the 2 spare discs
the vibrations running threw the system are clearly not a good thing, i believe everything that can vibrate demands attention if one clearly wants the very best sound quality from ones system,
Would you kindly suggest a product that i could place on all my connection points ie cdp to pre, pre to power, power amp terminals to speakers i like the idea of laying them little crystal packs you sell i look forward to your reply kind regards john