Hi Bob:The AMP300 is a stand-alone amplifier that features Priority Source switching between two source inputs. Line 1 Input takes priority over line 2 Input (there is a variable delay switch 3-15 seconds). It also features a Line 2 output from Line 2 input. We also offer an affordable Preamplifier our OSD Prreamp1 which adds additional front end control including a Mic Mixer, 4 Inputs one of which is for a Phono connection, a perfect match for the AMP300 and AMP200.The real question, will you need this amplifier based upon your application.TL/5581