Good stuff, Randy.
I should also mention that the other factors that determine the size and number of capacitors has to do with powersupply rails and whether or not the amplifier modules are bridged or not. The size and number of caps influence how fast voltage can be drawn from the powerrails and output. A good comparison is to look at two Bryston amps that have identical frequency response, THD, IMD, S/N and other specs.
I used to have a Bryston 14BSST a few years ago, which was the stereo version of the 7BSST monoblocks... the ones Axiom used as a basis for its development of the A-1400-8. Both these Bryston amps used the same components and had similar specs. However they differed somewhat in how the capacitors were arrayed and rail voltage.
The 7BSST monos had 16 x 10,000 mfd small capacitors close to the output section. The 14BSST used 4 x 27,000 mfd large capacitors instead of 16 small ones in the 7BSST. Also the 14BSST have a slightly lower powersuply voltage of 60 volts instead of 65 volts for the 7BSST.
People comparing these two similar amps reported a tighter more responsive sound with the 7BSST or a "softer" sound in the 14BSST, which can be attributed to the use of many small capacitors in the 7BSST and its higher voltage powerrails. Basically the 7BSST was able to respond more quickly to power demands during transients because of these small differences between the two amps.
