Amplifiers weight

What does amplifiers weight has to do with performance?

• Larger transformers weigh more
• Larger capacitors (and/or more of them) weigh more
• Thicker chassis material weighs more

Otherwise, not too much.  A thick face plate and heavy footers weigh more but those may or may not have an effect on performance.  However, there are many other factors that may affect performance but not weight, including the circuit design.

Thanks @cakyol , that was an interesting read.
Pass’ thoughts on weight vs. power and amplifier class, and the benefits of a suitably large power supply, seem logical but from the standpoint of sound quality there must be more to it since he continues to design new amplifier lines that apparently sound different/better than his previous amplifiers.

@millercarbon says,

" Mass matters."

The designer of my new amplifiers, SMc Audio, agrees and added their new "Gravity Base" to each of my new monoblocks.  The Gravity Base is basically a heavy brass plinth that anchors key components within the amplifier and serves as the base.  They proclaim the difference is not subtle.

@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.