Subwoofer RCA Cable

It will depend on who you ask, but most people who believe in investing in quality cables including me will say yes. I say it like this because any cable thread is bound to go south on this forum.

Wait for it…

Don't go cheap but don't go broke either. A quality RCA. I use the supplied NEUTRIK SPEAKON that came with my REL Subs. 

Sub cables typically have differences in both the conductor and/or dielectric (shielding) to prioritize the current delivery of lower frequencies and…

Interconnect cables are typically voltage devices as the input impedance is very high.
There is almost no current in these cables to speak of.

needed speed without worrying about the tone of the higher frequencies.

The speed of electricity is the same in all conductors, and it is about a million times higher than the speed of sound.

@holmz You are correct in both points but it does not necessarily prove me wrong. Any lowering in impedance, say from an improved dielectric and quality of conductor typically results in a faster, more open sound. Yes there may be very little current, but whatever is there, you should want instantaneously. 

As usual in audio, @koestner , you have received conflicting replies and will have to rely upon your own good judgement about what to do. It’s probably clear, I don’t think much of the magic by which expensive cables work. I call it "magic" because although physics can send people to the moon and get them back, it can’t explain the (sighted) differences that people hear with cables, pucks, crystals and such things. Some feel that psychology and statistics provide an explanation.

Not that cables can’t sound slightly different from one another. However, the difference usually is dwarfed by moving the speakers or listener a few inches. Some use cables as tone controls. A person might prefer an equalizer, which would allow one to change the tone control to suit various recordings.

For cables, I use what many pros use: Mogami, Belden, or Canare wire with good-quality Amphenol or Neutrik connectors. They are not the only choices for well engineered, neutral products, just a few reliable ones.

Whatever you decide, I hope it sounds great to your ears!