I don't consider 4 meters to be short. And, I don't
want to get in over my head in this dicussion, either.
I think some of it depends on the impedence of your speakers, the capacity of your amplifier, etc. I do believe I am safe in saying that cutting one meter off
your speaker cables most likely will produce a benefit that is sonically insignificant. Something like the
difference between listening to your system and then
moving about an inch closer to your speakers. And,
I do know there is some danger of corruption if your
speaker cables cross over themselves or if they are
coiled. This is why I don't like to have much slack
in my cables. Personally, I keep my amplifiers [monos] right next to my main speakers, so I need speaker
cables that are about one meter long. I'm sure others
are in the same position. I'm guessing there would
be a pretty good market for that one meter length of
cable you would cut from the end of your cables. So,
again, since it can only help to shorten your cables -- even if by an insignificant margin -- and will eliminate
the slack caused by having more cable than you need...
If you can do it and sell the one meter cables for equal
or more than it costs to have them cut and re-terminated, why not? I guess the downside would be
if you redecorated and needed that extra meter. Your call.