Length of Loudspeaker Cables

[Soniclife]

I have done a site search, but cannot establish whether there is, as with Naim, a minimum length of loudspeaker cable that my D400 - D440 to be - requires to avoid destabilising its output stages.
 
Any ideas?
 
Fraser

Naim are odd with this, but Devialet will cope with anything. My guess is their recommendation if they made one would be short runs of fat cable.