In reply to:

Is there really that much difference? Is it all a matter of preference and what sounds goood? or are there actual optimum settings that are better for certain speakers?



There can be.
Yes.
In a sense.
With bookshelf speakers i would always cross them higher if a sub is present but i have the M60s and prefer the tighter bass of those units over a larger sub driver. Hence, i have my M60s set to large and cross them at about 50Hz on my EP350 subwoofer. The sound blends very nicely.



"Those who preach the myths of audio are ignorant of truth."