Audio Input selection Modules are required for connecting Multiple Analogue audio sources to any Amplifier or Preamplifier. These Modules Use DPDT relays that electromagnetically Route any one of the various audio sources connected to the Amplifiers / Preamplifiers from the Input Sockets to the Main Processing Boards.The modules featured in this section use the best quality parts and PCB's for the price .Each Module has different Features Related to the kind of connectivity , number of inputs and control etc.