Hold function) of input level. In this mode use the UP/DOWN CURSOR KEY to expand the meter scale from -20dB to 0dB, to -40dB to 0dB.

3.SPEAKER SETUP (Page 17) There are three additional features in the SPEAKER SETUP menu:

Adjustable Crossover Frequency selectable in 10 Hz increments from 40 Hz to 140 Hz. This adjusts both the High Pass (2nd order, 12 dB/octave) feed to the loudspeaker, and the Low Pass (4th order, 24dB/octave) feed to the subwoofer.

Defeatable Subwoofer Filter. This allows you to use your powered subwoofer's internal crossover. This can be beneficial to tame difficult room acoustics problems by setting the subwoofer crossover to a different frequency than the S170's High Pass filter to create a notch or an overlap in the response.

Enhanced Bass, when selected, always has the subwoofer active, regardless of speaker settings, for maximum boom.

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NAD S170 owner manual