-
Extreme cable designs can act as primitive tone controls, that much I think can be substantiated
Every cable is a low pass filter, but for normal designs using parallel wires of circular cross section with common separation distance, the -3dB point is >10MHz. If you're using passive crossover speakers, the inductors and capacitors in your low pass section have values multiple orders of magnitude greater than the inductance and capacitance of your speaker cables. It's just about possible to materially affect the crossover frequency by having a lot of resistance in the speaker cables, but they would need to be very long or very thin, or both.
Citation needed.
Extreme cable designs can act as primitive tone controls, that much I think can be substantiated.