The amp has a power supply that is shared with the preamp if the Snaps or Hicap is not used. The Snaps has an interconnect that plugs into the 42 as does the 110. This is beneficial in that the amp uses its power supply alone and the Snaps is for the preamp and is better than the shared one in the amp. The Snaps is plugged into a wall outlet. If you have the factory interconnects remember that they are directional. It's been a long time but it seems the interconnects have a black band on one end. The black band end goes into the preamp. From the preamp the black band goes into the amp. My 42 was clearly labeled at each socket in the back.
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