Springs under turntable

My experience is the adjustment is less difficult with some choices of music you know very well...

Choose violins solo and in mass.... For higher frequencies...

Choose brass ensemble with tuba, trombone, trumpet and horn... for the bass level...

for example : Empire Brass playing Gabrielli

Human voice solo is useful indeed .....

Always adjust in relation to timbre accuracy never in relation to clarity only  or bass....

indranilson, you are certainly spending less than a MinuK platform which is no piece of cake to set up either. You have to move the turntable around on it to get it to balance right. Turntables never come with an arrow pointed at their center of mass.

There are racks like the Grand Prix Audio that isolate each shelf at a patently ridiculous price. IMHO, excepting the turntable, if you place all your equipment is separate enclosures isolating them from direct sound 
you are good to go. I do not like open racks. I prefer fully enclosed cabinets which are stiffer and easily damped. I do not put my equipment on display where it can collect dust. It is all hidden. Maybe I am just old fashioned 
 
The turntable being a vibration measurement device is another story. It has to be isolated from everything. I will never buy a turntable that is not suspended on an appropriate suspension.
The best thing to do is put your turntable in another room. Phono amps are now coming with balanced outputs that will make this much easier to do but most of us will not have that capability. 
The best way to shield the record, tonearm and cartridge from air born vibration is to cover the turntable during play, like putting ear muffs on.
My turntables have always sounded better with the dust cover down. The echo that you get with the dust cover up is an appealing euphoric distortion so, many are insistent that dust covers make things worse. Perhaps poorly designed ones do. But with my system people uniformly think it sounds better with the dust cover down.  

@mijostyn- Thanks for your such a thoughtful response. In my experience the isolation set-up process always is a precision job regardless of the component being a turntable or not and it takes a good amount of time. I would rather spend that time listening to the music... 
For me taking turntable to a different room would be a lot harder option and even then I have to isolate it to get the best performance. So I am exploring other options like isolation platforms, wall mounting etc. Currently I have a Clearaudio turntable and a Luxman phono amplifier. Going forward I would be likely getting a Acoustic Signature turntable which would be 3-4 times heavier than my current turntable. But that would happen only when I am able to get an isolation device, platform or footers, working to my satisfaction in my room. 
Thanks.

I have Elac Navis ARB-51 active speakers mounted on standard sand ballasted speaker stands.
The speakers are currently just "sitting' on the stands.
If I pursue  Nobsound spring isolation, I propose to use a granite platform supported by the isolators off a tiled concrete floor and rigidly fix the speakers to the stands , which are in turn spiked on the granite.
Are there any flaws in this set up?  
Thank You

Bobby1945, in that situation the springs are not isolating the speakers or the floor from anything. It is a concrete floor. The speakers should be solidly on the floor with the midrange drivers at ear level by whatever means looks best to you. It is almost a purely cosmetic decision.