What do you hear with a better/bigger power supply and output capacitors in same amp?

Just throwing components at an amp would be like buying a lottery ticket.  You have to know what you are doing.  I have a friend whose Almarro amp sits on top of a bank of capacitors twice as large as the amp.   It is the second best amp I've ever heard.  But he is a wizard at amp design and it is implemented perfectly.

Jerry

Hey OP,

Well, maybe nothing. We can talk some theory though.

When we imagine how things change from say, an undersized power supply to an oversized power supply the practical difference would be described as reduced output impedance.

The output impedance of an amp is a combination of many factors, including the number of output stages, amp topology (zero feedback vs. feedback) and the power supply sizing relative to the load.

With a purely resistive 8 Ohm load it is relatively easy to design an adequate power supply that ensures the amplifier performs up to it’s specified output, with a flat frequency response.

When impedances drop, and reactances rises is where things get more interesting and, generally speaking, a larger power supply will support the output stage and keep it "stiffer." That is, the amplifier performs equally well at all frequencies up to rated output.

In other words, along with the right amplifier circuitry, a low impedance power supply makes sure you get consistent performance regardless of load.  As your power supply gets smaller, the amp becomes more sensitive to the speaker load and the output will stop being flat and will start to track the speaker impedance.

So, all kind of depends on your speaker load, volume, speaker efficiency, etc. as to whether or not you’d hear any difference at all.

, including the number of output stages

Sorry, I meant to write: "... number of output devices" not stages.

It may help a little to understand that the power supply has to provide DC voltages.  Say + and - 50 VDC.

That voltage will drop, or sag, as the current needed by the amp stages increases.

The larger the power supply, the less sag in the voltage.  That is, the voltage will remain + and - 50 Volts, allowing the amplifier circuits to perform optimally.  this is what we call a "stiff" supply, because the power supply's output is constant despite the demand on it. 

No throwing components in DIY; certainly not qualified to. I'm talking upgrading to the mfr's mono version of a good stereo amp.

E.G. a 'Mark L' 200wpc stereo w/one large toroid and lots of capacitance.  Say you converted that to bridged mono (and added one more amp). Would that new additional output capacitance (double the caps from before) and the same transformer to power only one channel, would one hear anything?  I'd hope on extended dynamic passages it would help?  Might there be more air/bloom/body/detail, etc?

If the stereo version is all you're (me) gonna get, why monos? My speakers are small inefficient (85?) D2 towers (raidho) and seem to like power...