I see many 1/4 TS 'instrument' cables for sale with no mention of impedance.
- the speed of light in vacuum of ~300 000 km/s
- audio frequencies < 20 kHz
you get wavelengths of at least 15 km(!). (Don't forget the velocity factor!)
It seems that for the case of a high-impedance output (guitar) into a high-impedance input (amplifier), transmission line effects and thus the impedance of an instrument cable is negligible. Is this correct? What about the frequency response of those cables?
And what about connecting low impedance (<0.5 kOhm) inputs/outputs together? Example: guitar amplifier head and cabinets? Can I still use 'instrument' cables for that purpose or does cable impedance start mattering in those cases?