As An Experiment I Stuck A Few Things Under My Pre-Amp And Am Now On A Quest

You know that your mechanical control of vibration and resonance is right only when the qualitative change is perceived as astoundingly bigger than anything you waited for in timbre quality as in imaging and soundstage ( out of the speakers plane in depth and out by the sides of each speakers it is a recording dependant factor but very astonishing with 4 inches woofer and tiny speakers anyway filling a small room but li listen in nearfield with no comparison with any of my past headphones at all except the K340 who is at another quality level ) ... my bass go 50 hertz clear and extended because of my porthole retuning design with straws of different size ...

Forget simple metal spike ... Or anything simple ...

For me only heavy damping load on top passed some threshold of weight on my small box active two way speakers and under them sandwiches of mixed materials and minerals worked ... ( shungite plate-cork plate-oak plate-sorbothane plate-bamboo plate -many heavy granite plates , because these speakers are on my desk )...The damping load over them is near three times the weight of these 12 pounds speakers ..,.

Cymbals decay and clarity is a good sign ... Any boominess is a sign of unsuccess...A better balance between the frequencies with no compression ...

But the mechanical working embeddings control is not enough , you need EMI and electrical noise floor control , i take it with a good wall plug connector near the central panel of the house and my golden plate on all critical spots  ( shungite plate+copper) but all this is useless without an acoustically controlled room with good diffusion for my small speakers in particular and mechanical crosstalk small isolation with wood panels work for me but will not work for most because impractical ...😁 I live well with this impractical crazy panels separating each speakers from each of my ears  because i want good sound ...Most people will not go there ... ...

Some erroneously claim that we dont need acoustic control of the room in nearfield listening but they are completely wrong ... The sound speed in a very small room make any reflections acting on your ears perceptions almost as much as the direct or first wave ...

@ernstmach

I figured there was a reason tape would not effect your speakers.
 

For most of my history the finishes on my speakers would not have been affected. I find myself with the most beautiful finished speakers I have ever seen (a really nice treat).

There is a seismic vibrations detector in the app store. No need for anything other than an iphone

The sensor (accelerometer) on phones aren't sensitive enough to detect vibrations for home audio. If I put my hand on the floor, I can feel vibrations from my subwoofer, and on my desktop nearfield system I can feel small vibrations in the table, but the apps don't register anything until I tap on the surface. I tried a few apps on both iPhone and Android (Samsung).

@ghdprentice 

You do have some beautiful speakers! I wouldn't do anything that might possibly do any damage. Nice room you have too!

@ernstmach 

Thank you for your kind words.