Fred, it apparently isn't all that clear since both here and elsewhere I've seen the calculator used without adding the 6dB correction for room reflections(which is adequate for the typical listener distance of about 3 meters, but would still result in an inaccurate power number at significantly longer distances) which is found only in "other considerations". There's been a lot of "operator error" beside yours.
Jason, sure the composer sometimes intends part of his composition to be heard at a very low barely audible level. Turning the low level parts up louder defeats that intent and is a form of self-imposed volume compression as to those segments(and if not corrected before a sudden loud segment comes, you might get blasted out of your listening chair). On The Planets the volume setting for Neptune should be the same as for Mars and Jupiter.
