Hall Research VSM-I-A-16-16 - Manual (Page 25)

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Genesis™ Matrix Switches
3.1.8.1 Using the Front Panel VU meter
All units with audio option have this feature. Enter the audio adjustment mode as
described above. The bottom row of LEDs (output channel row) indicates the
sound level. The indicated gain/attenuation is based on the matrix’s internal
reference level of -10dBV (standard line-level).
On a 16x16 matrix LED position 10 corresponds to 0 VU (desired peak level).
Position 1 corresponds to -20 VU and position 16 corresponds to +6 VU.
Figure 12 –Comparison with Analog VU meter on a 16x16 Matrix
Figure 13 – Graph of VU dB level versus LED bar length