Mark Levinson No.326S line preamplifier
Conceptually, the preamplifier is the bottleneck in an audio system. All sources pass through it, and it influences every sound you hear. A system comprising great speakers and gutsy amplification will sound uninspired if that's the character of the preamplifier. Conversely, a great preamplifier will allow through so much information, so much of the music, that the listener can forgive the shortcomings of lesser speakers and amplifiers.