A cable question, sort of...


Hej

My Hi-Level cabel to my Rel sub is too long, can i coil it to make it shorter, or...? 
I don't want to cut it yet. 
simna
if it's the cable that came with the REL, you might want to consider an upgrade cable. I particularly like the upgrade REL and the Analysis Plus, and both come in much shorter lengths than the original REL...
Cable has two wires that create magnetic flux in opposite direction and coiling them would create something that is called "Common Mode Choke"
i think there’s a difference with common choke. In a common choke, the positive and negative have mutual inductance couple between them. When you coil up a cable, there is no mutual coupling like in that of a common choke.

As for the twisted pair, you do increase the mutual coupling, but just coiling up the cable, you just increase the inductance.  
It doesn't matter if you wind it as separate coils or interleave windings - it is still common mode choke.  It will present no inductance for differential signals, since both wires produce canceling magnetic flux.
As I said, common choke works because of mutual inductance coupling between the positive and negative. Coiling up the cable will not increase the mutual inductance since they wire still running in parallel in respect to each other. Not only that, by coiling up, you increase the mutual capacitance of the positive and negative which will degrade the signal dynamic.

If what you said is true then every speaker cables should be all coiling up.

Here's a pic of a common mode choke.  You have to coil it up in such a way to increase the common inductance coupling.  So in order to make a common mode choke, you first have to separate the positive and negative like the picture.  Just coiling up them all together won't make a common mode choke.

https://www.coilws.com/images/common-mode/common-mode-choke_schematics.jpg