Uneven speaker cable lengths?

I asked this question earlier and nobody responded. Has anybody heard a difference when using unmatched cable lengths? If the answer is no, then the whole question is effectively put to rest.

About 25 years ago when I was at a dealer listening to some speakers the owner was making speaker cables (from bulk) for a customer (me). After cutting the 1st 10ft and started on the 2nd there was a kink in the cable at 5ft. So he cut out the kink and made the second 10ft cable. For grins and giggles he put 1 10ft cable on 1 speaker and the 5ft on the other. It sounded like someone hit a reverb switch. Like the room just got a little bigger. I thought I liked it until he put the other 10ft cable back on. That said it was minor but I did hear a difference.

George (Xti16), was the system fully warmed up before and during these comparisons? And during any part of the comparisons were either of the cables placed near any other cables or power cords, or digital components for that matter, which might have resulted in EMI/RFI being picked up and injected into the feedback loop of the amplifier, assuming the amp had a feedback loop?

Regards,
-- Al

When I used uneven lengths of speaker cable some years ago (setup necessitated this, although I don't remember why) I found it did NOT affect the sound one iota (how much IS an iota anyway?)...maybe half an iota...but still...now I keep the lengths even for possible resale of cables, and because I can.