Speaker Cable Length

Hello @woots   I don't think so.  I had to make custom cables 24 and 34 feet getting to my speakers from my side of room components...no issues, even with different lengths.  I consulted speaker manufacturers on the lengths and was assured it would make no difference.  Did make a difference due to cost though!  i made mine from Furutech Alpha 36 with Furutech spades...fun project.

I, too, have to run 15 foot cables. No issues.

Nope it should be fine. You are very unlikely to hear any difference.  I use Transparent Ultra Gen6 speaker cables... I think mine are two meters, but I have used four meters before. These are great cables.  It’s not until you get up to 25 or 30 feet that there could be a noticeable difference 

Here is what Paul says:

https://www.youtube.com/watch?v=6e8UTpBOStA

I’ve been doing custom installation for 25 years... I’ve wired built in speakers with 16 gauge 4 conductor basic in wall speaker wire that is 300 to 500 feet of cable running through walls and conduits, and next to electrical main power wires...

Works fine, sounds great, no loss of bass... 15 feet of high end speaker wire is nothing, immeasurable and inaudible