Etymotic Musician Filters Filter NRR:ER-9 We chose this solution to

We chose this solution to offer a more comfortable earmold than acrylic for the Anesthesiologist's benefit during long use times

ER-9 Provides flat 9 dB sound reduction through the mid range and 15 dB in the highs (Best for vocals

33 mm (1/4andquot

Whether you operate a single location clinic or large multi-provider clinic

Etymotic Musician Filters Filter NRR:ER-9 We chose this solution toThis product page is for the Etymotic Filters only. The Etymotic musician ear plugs with filters, or buttons, have a diaphragm which functions as an acoustic compliance, while the volume of air in the sound bore of the custom ear mold acts as an acoustic mass. The combination of the two produces a resonance at approximately 2700 Hz (as in the normal ear), which results in smooth, flat attenuation. Etymotic Filters & Reduction Levels ER 9 Provides flat