Re: "Which will prove what, exactly?"
I used to do something similar - but with HiFi.
Amstrad had just brought out their crappy CD mini system for £250, I used to go in and ask for it to be demonstrated, go through all the settings (note they turned the treble right down to get rid of the awful hiss - even on CD), prevaricate for a bit then say that perhaps I would be better off spending the £250 getting my current turntable's stylus* re-tipped.
Amstrad System 1 was so awful, the best sounding component was the TUNER.
*Ortophon MC20 Super mounted on a Rega RB300 arm and fitted to a Manticore Mantra turntable.