Vibration isolation or absorption?


You see those pointy things at the bottom of a speaker that are very very sharp.  Arguably a weapon in the wrong hands.  And then you see those same pointy things inserted into a disk.

So the pointy things, aka ‘spikes’ , can Channel vibration elsewhere and away from the components and speakers, or they can isolate it.

Seems channeling vibration away from a component/ speaker, which I guess is absorption, is preferable.

Is this true? And why do they keep saying isolation.

 

emergingsoul

Showing 4 responses by atmasphere

Atmasphere,

You missed my point. 

Killing vibration is stupidity because you cannot destroy it. 

I don't think so. Its pretty obvious something else is going on here that has nothing to do with vibration...

Killing vibration is stupidity. Eliminating it is impossible. Fearing it makes for sales expansion. Using it as a tool to improve sound reproduction makes more sense. 

EAR makes damping compounds for damping the hulls of submarines (military application). 3M has a line of damping compounds as do a number of other companies- and some of these are used in cars to make them quieter inside. 

We used damping compounds in our preamps. Their effect is measurable and audible. My LP mastering lathe used adjustable points and a vibration damping platform, made about 1950.

But just on account of the fact that there are large businesses that make damping compounds, we can know that the post of the above quote is dubious. Killing vibration isn't stupid...🙄

But, when the most expensive platform with the highest degree of damping was put under the CD player, the sound became too dry and analytical.  This was not just my conclusion, but everyone else thought the same, including the Symposium representative.  The idea that the "ideal" is the least amount of vibrational energy is not always the case and this goes with all components as well as room treatments. 

What this suggests is that the damping system had a flaw; perhaps something like the system was ineffective at a certain frequency.

@emergingsoul 

I view this as 'points vs squishies'.

Points are used to move vibration into the mass to which the point is pointed. This is an old principle- I had an LP mastering lathe made about 1950. Its anti-vibration stand used adjustable points for feet.

Squishies are used to isolate- this is to prevent vibration from something else (like a shelf) from entering a piece of equipment (like a turntable). 

Platforms are supposed to be good at vibration absorption so usually the equipment placed on them has points that bear on the platform's surface. But it might have squishies beneath it to isolate it from a vibrating shelf or the like.

Speakers are supposed to be kept still so its common to see them use pointy feet.