You need to calibrate with an SPL meter, and sometimes you may need to adjust "on the fly" with action movies. Soundtrack recording is getting much better, but even releases from 1-2 years ago (Star Wars I as a glaring example) were just brutal for soft dialogue channels.

If you don't want to spring for an SPL meter, you can also try setting the mains at -2 to -3 dB and turning up the overall gain.

It's ALL ball bearings nowadays!!