Why is speaker wire so thin?

The other day I was installing a speakon Jack on my ampeg 810. Doing this, I of course has to cut and strip the wires which are around 18g or so. I've worked on many cabs, Ampeg, gallien Krueger, Mesa boogie, peavy, ect. They ALL have the thin, weak looking wire.

After I was done, I had to test it so I plugged in my huge 12g speaker cable and it occurred to me, "why do I need this huge cable to run the voltage when the wires inside are so tiny?" Those wires handle all that power, so why can't small speaker cables?

Before anyone says it's because amps are higher powered now, let us remember that a 70s SVT put out the same power as the new ones. Further, high power handling cabs means high power handling speaker.

I'm curious.
I had short thick speakon cables made for me. For me wanting thicker cables really doesn’t have anything to do with performance of the cab they are plugged into. It’s because I like how thicker cables are much less likely to become a tangled mess. When we finish a set I quickly stuff the two speakon cables in the back of my rackbag and zip it shut, when I go to take them out again they come right out, no untangling cables.
 
Too long a speaker wire and you lose almost all the amp's damping factor, ...

Damping factor is the best argument that I know of in favor of using speaker wiring that seems like overkill compared to the wiring practices used in other applications. One of the links above has a couple of articles that pooh-pooh the importance of damping factor due to what goes on inside a speaker anyway. To me that is more of a condemnation of the speaker design than the practice of paying attention to damping factor when selecting the speaker wire gauge.

Either way this is a matter of concern mostly for home audio system work where one of your primary concerns is reproducing a musical performance with very low distortion. Those of us who create music don't mind distortion as long as it is produced artistically! That would argue that in our case we may not be terribly concerned about amplifier damping factors. However, one group that I know of who were trying to make a solid state amp sound like a tube amp felt they were still too far from the goal after exhausting all the common and not so common techniques for building a solid state tube amp. One of them theorized that part of the tube amp sound might come from a tube amp's lower damping factor which allows the speakers to do their own thing and contribute to the final sound. So, they added some resistance to the speaker wiring and claimed that the result was a noticeable improvement in the fidelity of their solid state amp's faithfulness to its tube prototype's sound. Obviously your ears may disagree but this claim does make me consider damping factor something which should be considered and tested rather than pooh-poohed out of hand when you are putting together an amplifier/cabinet system.

As far as heat rise goes, well if you are constantly driving your amplifier output to square waves then your speaker wiring probably should comply with the NEC requirements since they are based on continuous full power delivery to the loads and that is the situation you have in that case. The rest of us are only hitting the amp's power output limit on the occasional peak, if then, and can back off on the NEC requirements.
 
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One of the links above has a couple of articles that pooh-pooh the importance of damping factor due to what goes on inside a speaker anyway.
With good reason. http://www.diyspeakers.net/Articles/Richard Pierce DAMPING FACTOR.pdf

The damping factor controversy arose after the invention of SS amps, which have a high damping factor, as opposed to tubes, which have a low damping factor. SS advocates pointed to high damping factor as why SS was superior, tube advocates pointed to low damping factor as why tubes were superior. Both camps were grasping at straws. Before SS and high damping factor came along no one worried about damping factor, and those in the know kept it that way.
 
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With good reason. http://www.diyspeakers.net/Articles/Richard Pierce DAMPING FACTOR.pdf

The damping factor controversy arose after the invention of SS amps, which have a high damping factor, as opposed to tubes, which have a low damping factor. SS advocates pointed to high damping factor as why SS was superior, tube advocates pointed to low damping factor as why tubes were superior. Both camps were grasping at straws. Before SS and high damping factor came along no one worried about damping factor, and those in the know kept it that way.

Read the article again. It argues against outrageous claims that have been made. It allows that damping factor may produce audible differences just not to the degree that some have claimed and not for the reason they claimed. It freely admits to having considered only one aspect of the controversy, the one most often alluded to by those making outrageous claims. I'm not claiming any more than what this author allows as within the realm of possibility at the conclusion of his analysis: there might be audible differences. And I know that some have claimed to hear them. This is the point where a double blind listening test would have to be done to confirm or deny that those claims are true. If true then the fun of sussing out why could begin in earnest.
 
Actually, in almost all cases 18 is plenty big. In fact, I would ask the question the other way around. Why are so many amp-to-speaker cab cables so big?

Electronically speaking, you are in a creek. You need a canoe. You do not need a ship.
 
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Actually, in almost all cases 18 is plenty big. I'm fact, I would ask the question the other way around. Why are so many amp-to-speaker cab cables so big?

Electronically speaking, you are in a creek. You need a canoe. You do not need a ship.

Marketing drives many things, especially in the accessory world ;)

Why do they make speaker cables so thick?

Because someone will buy them.
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... and we have a winner!
 
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Actually, in almost all cases 18 is plenty big. In fact, I would ask the question the other way around. Why are so many amp-to-speaker cab cables so big?

Electronically speaking, you are in a creek. You need a canoe. You do not need a ship.

I love explanations that use analogy; it's like having someone draw you a picture.