Power Cables

Yes, that's how it works. I'll provide a link. If an amplifier is correctly designed, "sagging capacitors" amounts to a cable marketing blurb. If you think any substantial amount of juice for your volume control is coming directly from the cable you paid a lot of $ for then you're not following the design topology and you're listening to music with your wallet.

http://www.radio-electronics.com/info/power-management/linear-power-supply-psu/basics-tutorial.php

“It would be silly to pack an 18 gauge power cable with a McIntosh, so they get a cable that at least "looks the part" and maintain their credibility”

My McIntosh MC2200 (200 wpc into 8, 4, and 2 ohms) has a stock and captive two prong power cord that is just about as “heavy” as the cord on the lamp sitting on my end table. Go figure.

wmarkhall
Re. Sagging capacitors...
But if one is "listening" with the level control at Ten, there will be no headroom remaining for the drummer to deliver the ’Coup de grâce’ to your eardrums. ;-)

https://www.youtube.com/watch?v=KOO5S4vxi0o