Impedance matching ? The impedances are supposed to be mismatched (low output impedance, high input impedance). An RCA interconnect should transfer voltage, not current.
However if the source has an unusually high output impedance, and the destination has a rather low input impedance then this will cause distortion in the signal ... perhaps this is what loontoon was referring to ?
My guess (based on some personal experience) is that quality of connection and overall capacitance are the two keys. For connection quality make sure everything is really really clean, and free from oxidation. For low capacitance I think you'd have to avoid the shielded coax type interconnects, use as much air as dielectric as possible, and PTFE where a dielectric must be used.
I think silver is possibly the best conductor because even surface oxide is conductive, gold is a lousy conductor (relatively) but prevents oxide formation on terminations.
That said I think capacitance is much more importance than resistance so copper / silver may be a wash.
I always solder because I don't have crimping tools.
However if the source has an unusually high output impedance, and the destination has a rather low input impedance then this will cause distortion in the signal ... perhaps this is what loontoon was referring to ?
My guess (based on some personal experience) is that quality of connection and overall capacitance are the two keys. For connection quality make sure everything is really really clean, and free from oxidation. For low capacitance I think you'd have to avoid the shielded coax type interconnects, use as much air as dielectric as possible, and PTFE where a dielectric must be used.
I think silver is possibly the best conductor because even surface oxide is conductive, gold is a lousy conductor (relatively) but prevents oxide formation on terminations.
That said I think capacitance is much more importance than resistance so copper / silver may be a wash.
I always solder because I don't have crimping tools.