I've done a quick search but can't find the answer to the following question:
Why is the engine noise from an A320/1/9 sooooooo completely different from that of a 737/9/8/7/6 even when they are both CFM engines?
Both on takeoff and landing, the A320 (even with IAE engines) noise is 50-100% more of a high-pitched whine. I'm RIGHT over all 3 north approach paths to SEA, a 737-dominated airport, and I can EASILY tell if the approaching airline is an A320/9/1 because of it's whine.
p.s. I did a 1-yr search on 'whine' and there was only 1 topic but it didn't answer that above question...