Re: Lower frequencies only
Earplugs - unless sold specifically for music gigs - don't attenuate all frequencies equally. That said, I've used them with some big Sennheisers over the top when sleeping on busses - the music sounded a bit murky and distant, but was fine to fall asleep to.
The above link is good, but I'm not sure I'd paraphrase as the OP above did. A lot of reviews are hailing the Sony MDR 1000X noise-cancelling headphones as the supplanting Bose as the new king.
https://www.whathifi.com/sony/mdr-1000x/review
Biting the hand that feeds IT
