The Sensgard ear protector was fully tested by an intrepid researcher using undercover techniques, I dressed up as Boris Johnson and went nightclubbing! Subjectively it was found to be effective, but the tubes seemed to be ineffective at attenuating the bass in the club. Officially, the Zem Sensgard is rated at 32.5 dB at 125 Hz linearly increasing to 37 dB noise reduction at 8 kHz with an NRR of 26. Merry Christmas to you all!
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