will different lengths affect sound

Of course they will. Point is if you can hear it. And that depends. I doubt that anyone can in case one cable is 6ft and another 8ft. But..maybe someone can. I cannot.

I use 8' and 14' cables and I cannot detect a difference. One wonders though. If I could at all avoid it, I would, if only to stop the voices.

I've always kinda liked this article on speaker cable lengths... http://www.audioholics.com/education/cables/speaker-cable-length-differences-do-they-matter

Funny about 25 yrs ago I was at a dealer playing with different length cables. If I remember correctly he used a 5' and 15' cable. It took a while but I could hear was what sounded like a ever so slight reverberation with the mismatched cable lengths. Some people in the store actually preferred that sound. Anyhow that was 25 years ago when my hearing was better.

>>12-07-11: Inna
Of course they will<<

Wrong.

You will not hear a difference unless, as Kal says, there is very large difference.

A few years ago at CES AJ Conti of Basis Audio connected one speaker with 6' of cable and another with 75' of cable. Not a single attendee could identify which speaker had the longer length.