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firmware option for soundexpert 721 and 821 to enable the computation and display of nc and rc curves. comes standard on 821env-d

X21 Option for NC and RC curves

Model X21-NCRC

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Firmware option for SoundExpert 721 and 821 to enable the computation and display of NC and RC curves. Comes standard on 821ENV-D

    Specification Notes

    English: SI:

    * All specifications are at room temperature unless otherwise specified.

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