What makes the biggest difference in sound quality?

Drivers> Crossover>DAC>Source>Amplifiers>Cables>Room Treatment>Fuses/outlets.  

EVERYTHING matters. All of it, every part of the audio chain is critical.

Your thread isn’t working out quite as hoped aye Ted 😉

Interconnects, speaker cables, power cords, or fuses?

None of the above.

None of the above

Especially if you have Lead in your ears. 

1. Room

2. Speaker Position

3. Speakers

4. Source/Pre Amp/Power amp

5. Cables