Are you talking about 70 dB of noise reduction, or reduction of noises which have an SPL of 70 dB?
this post was submitted on 27 Nov 2023
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reduction of noises up to 70 dB
This is currently impossible to do with active noise cancelling, and will be very uncomfortable to wear with passive noise reduction.
Peltor has some bluetooth hearing protectors that reduce by 30db, but I have no idea of their sound quality.
No, and companies will not do it because if you get hit by a car you might sue them.
Currently at their claim of 35-40dB reduction, they're already using "adaptive noise cancelling" which if you've used it, you'll know it's euphemism for "we won't actually reduce 40dB unless we detect that much noise shows up" which is so obviously to protect them from liability.