I checked mine and sure enough a couple of the bolts needed a full turn. I was careful not to tighten them too much, I wonder if KEF has a torque spec for them. I can’t say I noticed a big change, but definitely something to keep an eye on with these speakers.
A Note For LS50 Owners
I have an original pair from 2012. For no particular reason—other than the fact I’m always looking for a good tweak—it occurred to me to check the four bolts on the back that hold the boxes together.
Sure enough, overly loud listening over the past decade had loosened them. Without applying too much torque, I generally got at least a half turn with an Allen key, sometimes a full turn.
And the sound? I was blown away by the change. It was black and white, night and day, stop and go.
Well, not quite. But it was there. A little crisper, a bit cleaner on the transients. I think the speakers played a touch louder at the same power output. Certainly worth the price of admission.