Ribbon cables with polyester (Mylar®) films are essentially capacitors, and thus are supposed to have little inductance. Yes, a ribbon does indeed “remove” inductance but at the expense of thousands of pF capacitance across your amplifier. This is more an electrical component than a neutral “cable” that manages R, L and C.
Be careful using such extreme design “benchmark” cable types (either low L or C) as we are adding electrical components and not a “cable” per say. Modern cable design eclipses what earlier designs have tried to do, and at far more benign loading to amplifiers and speakers.
A zobel network is really a speaker mitigation circuit that smooths a driver’s low frequency impedance anomalies making the cross-over non-linearity smoother. Most speakers have an impedance rise on either side (ported speakers) of a driver above and below the resonant saddle frequency. Zobel circuits aren’t able to manage ultra high capacitance of a speaker lead. That’s not what they do.
Resistive load (less reactance) design speakers are best with ribbon cable over dynamic drivers (more reactance) and are better with high negative feedback amplifiers to manage overshoot caused by high capacitance loads.
ANY cable is NEVER 8-16 ohm through the audio band, it is electrically and physically impossible to do as Vp drop to ZERO at DC, where “AC impedance” is infinity. Using open-short low frequency impedance measurements ALL cable impedance will rise, significantly, in impedance below 1 kHz.
It is hard to justify adding tremendous capacitance across an amplifier in the name of “low inductance” as the result of the high capacitance can be far, far worse than the advantage of low inductance (let capacitance go any where it wants to). Ribbon cables are large capacitors…the specification data supplied says so. The nature of how amplifiers work suggest AVOIDING high capacitive loads. Designing low inductance AND low capacitance with low resistance is what a cable should try to do. This is better for ALL amp/speaker interfaces, ie no cable is the best cable.
Use them if you wish, there are better modern designs available that mitigate both L and C.
https://www.analog.com/en/analog-dialogue/articles/ask-the-applications-engineer-25.html#
Q. How does capacitive loading affect op amp performance?
A. To put it simply, it can turn your amplifier into an oscillator. Here’s how:
Op amps have an inherent output resistance, Ro, which, in conjunction with a capacitive load, forms an additional pole in the amplifier’s transfer function. As the Bode plot shows, at each pole the amplitude slope becomes more negative by 20 dB/ decade. Notice how each pole adds as much as -90° of phase shift. We can view instability from either of two perspectives. Looking at amplitude response on the log plot,circuit instability occurs when the sum of open-loop gain and feedback attenuation is greater than unity. Similarly, looking at phase response, an op amp will tend to oscillate at a frequency where loop phase shift exceeds -180°, if this frequency is below the closed-loop bandwidth. The closed-loop bandwidth of a voltage-feedback op amp circuit is equal to the op amp’s bandwidth product (GBP, or unity-gain frequency), divided by the circuit’s closed loop gain (ACL).
Phase margin of an op amp circuit can be thought of as the amount of additional phase shift at the closed loop bandwidth required to make the circuit unstable (i.e., phase shift + phase margin = -180°). As phase margin approaches zero, the loop phase shift approaches -180° and the op amp circuit approaches instability. Typically, values of phase margin much less than 45° can cause problems such as “peaking” in frequency response, and overshoot or “ringing” in step response. In order to maintain conservative phase margin, the pole generated by capacitive loading should be at least a decade above the circuit’s closed loop bandwidth.When it is not, consider the possibility of instability.