I want to add more source input capability to a Pioneer SX-1050. The 1050 does all the audio in my TV stereo system. I do have an AVR, but I much prefer the audio of the Pioneer so my AVR is limited to doing video switching. The Pioneer has four inputs and I need six. One way to add additional source inputs is to put a Musical Fidelity A3cr Preamp to use that I’ve had in storage. The suggestion was to connect Tape Out on the Musical Fidelity to Aux on the Pioneer. But I was warned that the impedance must be compatible.\n\nUnfortunately, I know zip about impedance and less about how to check it. So Im hoping someone who reads this will know more about it than I do and tell me what I need to do. Or maybe I don’t even need to worry about it.