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Probably off, Electric muffs just have mic's and speakers to let you hear between shots.. they're suppose to cut out on loud noises.. key word "suppose to".
When they cut out it's just like they're off so if they're working correctly I guess it makes no difference but off should guarantee best results.
Regardless if on or off the foam that actually does the noise reducing is passive and always working.
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NRA sold us out
This is America!, You have the right to be stupid.
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