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How do they reduce noise without any batteries installed?
Can you mess with the fit so that there is a position where they work well at reducing sounds (still without batteries installed)?
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They have NRR rating of 22. At least I can use my Ipod with them.
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My electronic muffs have no apparent effect till I pass a threshold, which I hear immediately, after which they amplify faint noises ( this is how I can tell the electronics are working & tuned), but still don't pass loud noises electronically, even after I pass this point. They will still allow some sound through whatever I do, this is the sound beyond the 28dB reduction they claim for the un-powered setup.
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With mine turned up all the way, I can hear voices well, a plastic bag very good.
But when you turn something loud on like a blender, the thing makes them louder...
With the muffs on my head and OFF the difference in sound from using the knob(on, 10%~100%) is not that much noticeable.