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The diagram on the left shows noise compensation with NoiseGard™: Passive hearing
protectors effectively attenuate noise from the middle and upper frequency range, the
effect decreasing sharply in the lower range. However, active noise compensation with
NoiseGard™ combined with passiv e hearing protectors results in a reduction of noise of
approx. 25 dB in the 25–500 Hz frequency range. The total attenuation resulting from
active and passive noise compensation is about 30 dB over the entire audio range.
A 10 dB reduction in noise is perceived subjectively as a halving in volume. A further
reduction in noise of 10 dB again results in a decrease in unwanted noise by 50 %.
HMEC300US.book Se ite 29 Mittwoch, 7. April 2004 3:24 15
Summary of Contents for HMDC HMEC 300 400
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Page 75: ...Notice d emploi HMDC 322 HMEC 300 302 305 305 C 306 322 400...
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Page 112: ...Istruzioni per l uso HMDC 322 HMEC 300 302 305 305 C 306 322 400...
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Page 149: ...Instruciones para el uso HMDC 322 HMEC 300 302 305 305 C 306 322 400...
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Page 186: ...Gebruiksaanwijzing HMDC 322 HMEC 300 302 305 305 C 306 322 400...