Amplifiers weight

My class D was $90/lb and I can carry it with one arm. Previously I had an 88 lb Pass behemoth which I could boil water on for pasta which I do not miss.

Weight obviously exudes feelings of quality. I remember back in the 90’s I opened up my Pioneer elite CD player to find a metal plate affixed in the middle of the chassis with no other purpose I could think of other than to provide weight, either for vibration control or just to add weight.

@elliottbnewcombjr .......Toobox safety talk - Don't lift and twist!

@adurerca ....2 plates in my PD-65 if I remember correctly, intended to isolate the power supplies from the digital stuff.  I believe the chassis was copper.   The player read the CDs turntable style (upside down) and visitors would always put them in top-side up and ask, "why doesn't this play?"

@geoffkait 

Isolate any amp, even a very heavy one and it will sound better

I have been curious about how my SRA stands work to isolate, damp, or whatever they do for my two new monoblocks.  The SRA folks apparently also do work for the defense industry so for them - mum's the word.  However, they needed the amplifier's weight, the dimensions of the foot print, and other information about the amps, so they could do their thing and "recalibrate" my stands to match this specific pair of amplifiers (the stands were previously calibrated for their former owner's amplifiers).  This "recalibration" was all internal since the stands look identical to when I sent them in to SRA. 
When I set them up, I was somewhat curious to find that the "legs" of the stands  (stainless steel threaded rod) actually attach about halfway up into the depth of the stands, inside of cylindrical pockets accessible from the bottom, and the attachment seems somewhat articulating (by a small amount) so that the legs are not absolutely rigid in the x-y plane but rather seem to allow the platform to have a very small amount of freedom in the x and y directions, but not in the z direction, where maybe the (elastomeric?) internal damping inside of the stand comes into play.
Geoff, how many degrees of freedom do you consider your springs have?  Typically, a spring is thought to operate in only one degree of freedom, in the case of a vertical spring it would be the z direction.  However, depending on the slenderness of the spring (i.e., length vs. diameter), and the weight of the object supported, perhaps a torsional force could allow the spring to rotate.  I am curious how the isolation provided by your springs compares to an elastomer type spring such as the Herbies products.
While it is fun to think about this stuff, everyone has their own opinion so the best way seems to be to try different products, listen, and keep what you like.  I like the SRA stands because they look good and seem to do nothing wrong.  BTW, the amps have Stillpoints as footers, which the SRA folks said was basically unnecessary with their stands.

mitch2
Geoff, how many degrees of freedom do you consider your springs have? Typically, a spring is thought to operate in only one degree of freedom, in the case of a vertical spring it would be the z direction. However, depending on the slenderness of the spring (i.e., length vs. diameter), and the weight of the object supported, perhaps a torsional force could allow the spring to rotate. I am curious how the isolation provided by your springs compares to an elastomer type spring such as the Herbies products.

>>>My springs isolate primarily in the vertical direction 🔝 only, but there can be some rotational 🔄 isolation depending on how the system is set up. But simple springs like mine offer no isolation in the horizontal plane 🔛. That’s why a lot of folks use roller bearings AND springs to get isolation in all six directions or most of them anyway. Springs should be selected based on mass of component and the whole shebang should have a very low resonant frequency, 2 or 3 Hz is very good, below 2 Hz even better as there’s a lot of Earth motion in the range 0-5 Hz. I suspect MOST of the vibration especially for the basement or first floor is in the vertical direction. 🔝 So why pay for a Mercedes when a Volkswagen will suffice?