Best noise reduction ear-muffs with audio input

I previously got a Howard Leight earmuff but my girl still say she can hear her autist brother
shouting/wailing.  She listens a lot on her iPhone for music & often has to take out the HLeight's
earmuff before inserting her Apple earphone in.

Was looking at above eBay links: is 37 NRR truly the best in blocking noise?
Or is there one that give noise blocking with an added music input wirelessly to cancel off the brother's shoutings?
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☠ MASQ ☠Commented:
You might want to look at this thread
Not much has changed since that was written.
sunhuxAuthor Commented:
I've read about 3M Peltor ear muffs in Amazon but there's a couple of
customers there commented the Howard Leight's is more comfortable
for the same amount of noise reduction.
Also got my girl those Heros ear plugs but she doesn't find them comfortable;
at least the Howard Leight's muffs are comfortable & she uses them
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☠ MASQ ☠Commented:
dB are a measure of sound attenuation.  NRR is meant to be a standard measurement of dB.

NRR Ratings by manufacturers are pretty subjective, they are usually in a lab with a perfect fit.  NRR's should ideally be quoted as a range to show the best and worst noise reduction for a group of users as "user's mileage may vary" but currently most NPA labelling shows just a single value that represents the best that was possible in the lab.  As a rule of thumb reduce the NRR score by about 5-10dB to give you the worst the user is likely to get.  If you're lucky you'll get closer to the quoted rating.

Currently expect any quoted NRR to be higher than the actual value in real-life use.

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sunhuxAuthor Commented:

Would the above item help to further reduce or neutralize the noises from the autist brother?
My country uses 220-240V but the above item uses 120V;  if only there's an eBay item that
could do the conversion
☠ MASQ ☠Commented:
Also available on 240V :)
(I guess it's got a switchable transformer built in anyway.)

White noise generators work by producing low level noise locally and by distraction so in her situation that's not something that's predictable - will she be listening out for her brother?  If so it won't really make a big difference.
sunhuxAuthor Commented:
Hmm, as the disruption from her bro is so bad, guess I'll have to hazard a try.
Appears that when she's on music with the Howard Leight muff on, she won't
hear it but she'll hear her bro with the muff alone.

If she run the slim white apple earphone cable through the muffs, does it
allow some noises to go thru the "tiny" gaps which the cables run thru the
muffs or this will be negligible?

It's for this reason that I'm looking out for muffs which has an audio in jack
which I don't find one so far with 34 dB reduction (those by 3M Plextor are
about 22-25 dB) : so if the noises going thru the tiny gaps is negligible, then
I might as well go for the highest noise reduction muff ie the item below:
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