A cable question, sort of...

I give up.

Kijanki is correct that coiling a cable in which the + and - conductors are twisted together or at least bundled together closely will not increase inductance to any significant degree. But **even if** it did so it still wouldn’t matter because the impedance presented by an inductance is directly proportional to frequency, and under any reasonable circumstances that impedance will be insignificant at the deep bass frequencies that are reproduced by the sub. And **even if** it is not measurably insignificant, it will be totally insignificant relative to the input impedance of the sub’s amplifier, which is very high as Miller indicated, and therefore it still wouldn’t make any difference.

Also, any slight increase in capacitance that may result from coiling won’t matter either at deep bass frequencies, and unless it is extremely high, and the amplifier is extremely sensitive to load capacitance it won’t affect the signals the amp is providing to the main speakers either. And of course the resistance of the cable won’t be affected by coiling.

Regards,
-- Al

Kijanki is correct that coiling a cable in which the + and - conductors are twisted together or at least bundled together closely will not increase inductance to any significant degree.

That’s not what he said that which I was arguing about. The point he made about "common choke" which was the point of contention.

But **even if** it did so it still wouldn’t matter because the impedance presented by an inductance is directly proportional to frequency, and under any reasonable circumstances that impedance will be insignificant at the deep bass frequencies that are reproduced by the sub

Well ... to which degree it will have an affect on the sound is up to the listener. With a good system, the difference could be significant.

 any slight increase in capacitance that may result from coiling won’t matter either at deep bass frequencies ...

Again, it may be insignificant in your system, but it may be very significant in some other system.

Thank you Al.  If we connect speaker with two separate wires apart the inductance of such connection would be proportional to area in between wires.  Bringing wires very close would make this area (and inductance) close to zero.  Twisting speaker wires (it would be stupid not to) reduces inductance even further reducing magnetic flux, that wires produce, to practically zero.  That's why twisting wires not only reduces electromagnetic radiation but also electromagnetic pickup (also capacitive pickup).  Coiling such two wires, even when not twisted creates bifilar coil - a type of common mode choke.  It doesn't matter if it is an air coil or it is on the ferrite core.  Mutual inductance is as high as it gets since two coils (wire and return) are interleaved.

https://www.wikiwand.com/en/Bifilar_coil