How hearing protection works
The loudest noise on a range peaks at roughly 140 to 165 decibels. Permanent hearing damage starts well below that. Most people pick ear protection by the number on the box. The number matters, but you only get it if the muff fits.
Fit and seal
A muff rated SNR 29 reaches that figure only when the cushion seals all the way around your ear. The usual leaks are the arms of your shooting glasses, a hat brim under the cup, and old foam that has gone hard. A foam cushion rests on top of a glasses arm and leaves a gap beside it. A gel cushion is softer and closes around the arm, so the seal holds with glasses on.
Passive and electronic muffs
A passive muff makes everything quieter: the shot, and also range commands, the person next to you and the game you are listening for. An electronic muff has microphones on the outside and speakers inside. It plays quiet sounds louder, and when a loud sound arrives it compresses the peak. The VX1 PRO does that in 0.02 seconds. It has four microphones, two on each cup, so you can tell which side a sound came from.
SNR and NRR
Europe and the US test hearing protection with different lab methods. SNR (Single Number Rating, standard EN 352) is the European figure. NRR (Noise Reduction Rating, ANSI S3.19) is the American one. The same muff gets a different number from each test, usually a few dB apart. Both are valid. They are different test methods.
The VX1 PRO is rated SNR 29 under EN 352. It does not have a US NRR figure yet.
What SNR 29 means in practice
Under lab conditions, SNR 29 reduces the sound level reaching your ear by up to 29 dB. On the range, the result depends on fit and seal. A muff that seals well can protect better than a higher-rated muff with a gap at your glasses.
Common questions
Is SNR the same as NRR? No. They come from two test standards, one European and one American. For the same muff, the SNR figure is usually a few dB higher than the NRR figure.
Do electronic muffs protect when the batteries die? Yes. The shell and the cushions keep blocking noise. You only lose the amplified sound until you change the batteries.
Is more amplification better? No. Ambient sound that is too loud startles you and wears you out over a long session. The VX1 PRO amplifies up to 6×.