It is probably an attenuator - best to make sure all your volume controls in the chain are operating above 12 PM.
If, for example, your preamp volume is mostly between 8 and 10 oclock then you might want to lower your power amp volume to 1 PM. Anything more than 12 PM will probably be optimal on all volume controls. Anything less than 10 PM is starting to get into less than ideal territory.
If, for example, your preamp volume is mostly between 8 and 10 oclock then you might want to lower your power amp volume to 1 PM. Anything more than 12 PM will probably be optimal on all volume controls. Anything less than 10 PM is starting to get into less than ideal territory.