NOTE: TRU filters do NOT fit other Westone and ER or Etymotic musician ear plugs.
Westone TRU™ Professional Musician ear plugs offer a choice of four attenuation levels:
WM10 (14dB Average, NRR 2)
WM16 (18dB Average, NRR 7)
WM20 (21dB Average, NRR 12)
WM25 (24dB Average, NRR 16)
Westone TRU advanced acoustic filters let you accurately and clearly hear whatever you are listening to, but just at a reduced volume. One set of filters comes with your purchase of full custom TRU ear plugs, and additional filters are available for purchase separately. The filters just snap right into the custom molds, so you can easily swap the filters as needed. The chart that follows shows the attenuation profile of each of the four different filters to help you choose.
NOTE: It is common with musician ear plugs for the vendors to quote an "Average Attenuation" and this will always be higher than the NRR (Noise Reduction Rating.) The reason for this is that NRR is meant to help the user choose a hearing protector that will protect against hearing loss. Because the higher frequencies are more dangerous, the NRR is weighted so that it tells the user how effective the device will be mainly at the higher frequencies. Because musicians want to be able to hear the high notes as well as the low notes, the average attenuation gives a clearer picture of what the ear plugs will let you hear. In choosing a hearing protector when you are concerned about protecting your hearing, always refer to the NRR rather than to the average attenuation. The NRR will tell you how much protection against damage you are getting. The Average Attenuation will tell you how much the device will reduce the volume over all.
