I note that inside the Sony APMs I currently own, the wiring, running up to a couple of feet in length, is very thin, nowhere near as thick as lamp AC cord. I wonder if using snooty speaker cable, or even lamp cord inside of them, would improve the sound.
What a bit of work that would be.
I wonder if the really expensive loudspeakers use very thick/quality wiring. These are of course the folks who (correctly) recommend that you place your power amplifier between the speakers and use the minimum amount of wire possible, to keep the signal at its best. If there is an equal amount of low-quality wiring inside the speakers...