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Imagine you are in a large room listening to someone whispering at the other side of the room.
The volume is low ( A values) but you can clearly make out every word, high Q value.
Now fill the room with other people all talking, the noise level is very high, the person talking to you is almost shouting in your ear ( high volume, high A value) but you still cannot make out some words they say,
low Q value. So what matters most is the Q value because you want to make out all the words they are saying regardless of how loud.