Hi @Yorkshireman,
The new NAP250 does have Zobel networks (makes speaker impedances look more resistive and less inductive) and output resistors. This greatly increases stability with a wide variety of cables. We do many tests during dev. FYI there’s also other compensation networks within the amp (1x lag compensation, 2x lead compensation)
This is the same as NAP250DR and the previous gen 250.
We do still find they sound better with a few meters of cable but no technical reason to not use short cables if it suits your setup.
Very early Naim could go unstable with some speaker leads e.g. Nait 1 didn’t have an output resistor.
Best
Steve