Speaker Impedance and amplifier design

 

There’s been a lot of techno speak on the various forums to readers about the advantages of using loudspeaker impedances of specific values, some even discussing the merits of 4 Ohms as only being used in very high end systems. The question here is based on another question:  If a great sounding system works well driving an 8 Ohm why would you then think a 4 Ohm would make it sound better?

 2 Way Loudspeaker crossover – Wiki Commons German Wiki Frank Klemm

Certainly car audio is often found with 4 Ohm speakers, sometimes in parallel to get 2 Ohms.  Does it sound better than 4 Ohms?

Is a system designed to drive an 8 Ohm speaker then  inferior to that which can drive a 4 Ohm speaker?