System matching would include an amp with (1) balanced inputs, (2) a sound that is round, full, and dynamic, (3) resolution and transparency to allow the detail and speed to come through. An inappropriate match could result in the Wadia being lean and dry. One also should avoid matching with something slow and syruppy.
Not having heard the combination, the description of the Lamm appears appropriate. The greater consideration may be how the Lamm interacts with your speakers.
A preamp is system and user dependent. There is no consensus.
Rob