Adveser Messages: 434 Registered: July 2009 Location: USA
Illuminati (1st Degree)
Looks like the same thing that SRD used to make called a power soak. It essentially changes the wattage that the speakers get. The electronics in an amp have different tone depending on how much saturation occurs and this makes it possible to change those values to what you want while changing the volume to the level that is desired.