A passive pre-amp doesn't amplify the signal. It only attenuates the signal from the source.
A "Passive pre-amp" can come with one or more inputs but the use of the name "passive pre-amp" is inappropriate. Your impression is correct. It is a passive 'line stage', or in the case of a single input its simply an inline volume control/attenuator.
A "Passive pre-amp" can come with one or more inputs but the use of the name "passive pre-amp" is inappropriate. Your impression is correct. It is a passive 'line stage', or in the case of a single input its simply an inline volume control/attenuator.