<font color='#000000'>Making a flat speaker cable out of ribbon cable to be 4 Ohms does not make sense. Sure, the cable and the load (speaker)will be matched, but the source (amp) impedance is a fraction of an Ohm. You still have an unmatched system. Furthermore, this impedance matching technique that is used at RF frequencies is done because interconnects are several wavelegths long. In low frequency Audio applications, the length from amp to speaker is a tiny fraction of wavelength. So you can assume that the cable is a lumped RLC element!
Or am I wrong?</font>