Passive Preamplifier In essence is merely a volume control designed to attenuate the signal going from the source (usually a CD player) to the amplifier. Since it is passive, it has no inherent gain because it has no active components (tubes or transistors) in the signal path
^That^ is all true, but an active preamp is almost always an attenuation device too.
The active does have a lower output impedance.
By using neither one, the OP saved needing another cable.