µ-Dimension Glow DSP8 Instruction Manual page 38

As you adjust the system for relative levels between the subs,
midranges, tweeters, etc, you may need to reduce some outputs
relative to others. Remember that you have set the levels to their
absolute maximum possible with minimal clipping/distortion, so any
additional level changes, whether it is in the equalizer or an input or
output level, needs to be a reduction in level. Any increases in level
may send the signal into undesirable clipping and potentially audible
distortion.
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