Oordoppen onder een actieve kap klinkt tegenstrijdig, maar werkt uitstekend: de doppen vangen de piek extra af, en omdat de kap het omgevingsgeluid versterkt, blijf je commando's gewoon horen. Op indoor-banen met grote kalibers is dit de standaard-aanpak van instructeurs. Let er wel op dat je de versterking van de kap dan iets hoger zet, en kies doppen met een lagere demping (rond 20 dB) zodat spraak verstaanbaar blijft.

NRR and SNR explained

Q: What the numbers mean

NRR (Noise Reduction Rating, de Amerikaanse norm) en SNR (Single Number Rating, de Europese norm) geven allebei aan hoeveel decibel de bescherming gemiddeld van het geluid afhaalt. Een kap met NRR 22 haalt ruwweg 22 dB van de knal af. De twee normen meten net anders; dezelfde kap scoort in SNR meestal een paar punten hoger dan in NRR. Vergelijk dus alleen NRR met NRR en SNR met SNR. Belangrijk: decibellen zijn logaritmisch. Elke 3 dB extra demping halveert de geluidsenergie die je oor bereikt. Het verschil tussen 22 en 25 dB is dus groter dan het lijkt.

Every earmuff carries an attenuation number: NRR 22, SNR 29. What does that actually mean, and is higher always better? Shorter answer than you expect: no.

What the numbers mean

NRR (Noise Reduction Rating, the American standard) and SNR (Single Number Rating, the European standard) both state how many decibels the protection removes on average. A muff rated NRR 22 takes roughly 22 dB off the blast. The two standards measure slightly differently; the same muff usually scores a few points higher in SNR than in NRR. So only compare NRR with NRR and SNR with SNR.

Important: decibels are logarithmic. Every extra 3 dB of attenuation halves the sound energy reaching your ear. The difference between 22 and 25 dB is bigger than it looks.

Is higher always better?

No, and that is the classic beginner mistake. With electronic muffs, more attenuation usually means thicker, heavier cups that knock against your stock, more isolation from your surroundings, and more clamping pressure. A muff that attenuates so much you take it off after an hour protects worse than a comfortable one you wear all day. The best protection is the one you actually keep wearing.

Rule of thumb per discipline: clays and rimfire outdoors: NRR 22 is enough. Indoor ranges and large calibers: combine the muff with foam earplugs underneath and stack attenuation without buying a bulky muff.

Double protection

Earplugs under an electronic muff sounds contradictory but works brilliantly: the plugs take an extra bite out of the peak, and because the muff amplifies ambient sound you still hear commands clearly. On indoor ranges with large calibers this is the standard instructor approach.

Do turn the muff's amplification up a little, and pick plugs with modest attenuation (around 20 dB) so speech stays intelligible.

Straight to the product

EARMOR M31 MOD3The entry model that gets everything right

EARMOR oordoppenThe second layer, or the spare in your bag

EARMOR M32H MOD3Helmet and comms in one

Apply it to your choice?

With NRR 22 the EARMOR series sits exactly in the comfortable middle.

See the models Earplugs on Amazon