Some hear bass frequencies more , some made so much studio at high level that they dont even hear high frequencies anymore. Its just like vision some need glasses, some dont, some dont see colors the same way , some dont even see colors....
So when you search that perfect tone, and find it, dont expect everyone to hear it the same way than your ears...
That explains why some people can't seem to dial a decent tone out of the the KPA, while others (like me) think the toaster(!) is the greatest thing since sliced bread......