Working from the reasonable assumption that no cable is perfect, and that all cables, therefore, have a negative impact (albeit small) on perceived sound quality, it seems likely that a cable half as long has less of a negative impact.
I tried it with some good quality stereo interconnect cables that were too long. I cut the to ⅓ their original length. Yes, there was a tangible improvement.
The benefits are greater with "signal" cables than speaker cables in every application- be it "HiFi" (whatever that is), PA, studio or in a bass rig.
Edited for- output impedance makes a difference. I have an active Vigier which has an unbalanced low impedance output (600ohm).
It makes very little difference which lead I use, or how long it is. It also send to make the signal less affected by effects. Weird.