Joegio. Generally, the input impedance of a piece of audio eauipment is not important, as long as it is higher than the minimum recommended load impedance of the piece of equipment feeding the signal to it. Most CD players for example have an output impedance of a few hundred ohms, and will happily drive a signal into say 5 K Ohms. This means that they will be even happier driving into 100K or 200K. In Professional Audio or Broadcasting, the rule is that you can always drive a low impedance into a high impedance, but not the other way around. Hope this helps.