Does length matter ?

yes

doesn't matter that much but ocd prevails usually

Keeping the same length is the “correct” thing to do. I have just always stuck with the rule. Once I had heard the huge differences in interconnects and cables... and had gone through extensive (hundreds of hours of) comparisons carefully noting the differences that they made on components, and found sonic differences in stable platforms... I just dicided it was easier to go with the conventional wisdom instead of testing and proving it to myself. After all, it is just a yes or no question. Just safer to keep them the same length. I have read professional reviewers say why it is important.

Of course you should if you can.
By connecting speakers to an amp you are creating (or extending) a circuit and, since in stereo we have two channels, i.e. two electronically identical circuits, it's good to keep them that way. By using wires of different lengths, the circuits are dissimilar.
The sonic effects are, of course, minimal in most cases

There's no technical reason to keep them the same length (within reason). That cable is 1.03Ω/1000ft, so if you had one 10ft and the other 20 then the difference in resistance would be 0.0103Ω which is negligible and will make no difference to the sound quality. If one is longer than it needs to be then you may inadvertently create an inductor where it coils back on itself, this is also unlikely to impact audio unless there are a fair few turns.
If you are worried about the time difference between the cables, for the 20 and 10 ft example it would be around 10 nanoseconds or 1 cycle at 100MHz... which is again negligible in audio.
I suggest the best thing to do is to cut each cable the length it needs to be to reach from the amp to the speaker.

I don’t believe you will hear a difference in the music with different speaker cable lengths however should you ever want to sell the speaker cables it would most likely be more difficult to accomplish. I personally have not heard a difference with two different lengths of speaker cable.

As @lak said, it matters if you want to sell them at some point.

Technically it matters but you might never hear s difference.

No difference. The near speed of light that electrons flow, means you wont be able to tell the difference, as also stated above the ohm load is  .0103. I found that as also stated coiling extra cable can cause issues of its own. I now use whatever length is esthetic to the install.

I had always heard that girth mattered more ... :)

Cables that low quality I doubt would Matter that much.

@audioman58

The cables are definitely NOT low quality.  High price does not always equal more performance.  Belden is a VERY respected company.

Transparent Audio used to cut cable to client length. Not sure now

Belden is a professional audio recording company. That is a different market. I’m not saying their is anything wrong with there products. I did some research on a competitor of theirs and concluded that dollar for dollar they were in line with high end products for SQ. Dollar for dollar was the key... a friend of mine wanted to choose between $100 of pro audio recording vs $1,200 of high end interconnects. 

your wires should always be the same length for sure to match sound in both channels.

I had always heard that girth mattered more ... :)

the answer: 9

the question: with the thread title, how many posts would it take before someone said this? hehe

Введите свой текст ...Buy the same length (if the cable is good) - then you can sell it ... but belden - no one will buy it)))

@jjss49 

https://www.youtube.com/watch?v=hvrupRQD44I

Maria's got the next obvious 'who's gonna go There'?

Consider That covered, and we'll move on...'nothing to see here, move along...'  ;)

Cheers 'n jeers, J

I fall into the 'same length, same diameter' crowd, btw...

If cable length doesn't matter you can be damn sure cable type makes no difference either.

Not exactly an apples to apples comparison here, bit I have seen some pro applications where the difference in length from left to right was as much as 75 feet and no one was ever able to tell any difference.

Wife says it doesn’t matter, but I don’t really know😇