The ideal partner for our NAC 152 XS preamplifier or NAC-N 172 XS streaming preamplifier, the NAP 155 XS features a substantial, custom-designed toroidal transformer with separate transformer windings for each output channel. It delivers 60 watts per channel (into 8 ohms) and will become the musical engine of a modern or traditional hi-fi system, whether the source is a digital stream, CD or vinyl.