You got some points that are 'generally acceptable' by the masses.
Want more got to have more $$$$,
Room treatments could be considered about fine tuning to the
listeners in the less than 45 age group. Above that age group
the room treatments must include the corrections for reverbaration
time of the sound generated in the room; because the reverb time
affects the hearing ability of elderly listeners much more than
younger listeners, and will distort, alter or mask out the other incoming sound to the ears. So the room treatments could be
considered as enable the elderly listeners to listen to music
playback more easily.
If elderly listeners are to continue to enjoy music from their hifi
sysems as before they are affected careful room treatments
must be look into. Or else these elderly listeners will enjoy less of
the music and not aware/aware of the differences but thought the
equipments are at fault.
There we were at the KLIAV and adjouned for a drink at the
refreshment area, open air but under a canopy. The reverberation
time was so bad that the 3 senior citizens could hardly make out
what the other 3 younger guys were talking about. The 3 younger
guys had no trouble hearing while the older guys had to raise their
voices a bit as we can't even hear the conversation well. This is
1 example of hearing disability.