AKG DMM 6 User Instructions page 57

Operation
The settings range from +20 dBu to -25 dBu. One LED is illuminated at +20 dBu, while the
entire LED ring is illuminated at -25 dBu.
Figure 37: Increments on the LED ring for the COMPRESSOR function
The adjustable increments are equal to 3 dB per click and also correspond to one LED.
Figure 38: Adjustment range for the COMPRESSOR function
DMM 6 57