On June 11, 2012 at 10:44, ILO said...
From Snap's website...
"Gain Controls
The EA-AMP-12D-70A offers gain adjustments for each channel pair, allowing you to independently trim output levels in each zone whether using the global or line level inputs. In volume control-based systems, these may be used to prevent harmful clipping that could cause damage to the amplifier or speakers."
Would be more helpful if you quoted the same amp as being discussed.