Oh boy. Much ink has been spilled on this subject here.
Originally Posted by Novak
I think I can represent the official view as follows:
1. It will make no difference what terminals you use.
2. Replacing the standard links will make no difference whatsoever to the sound. Save your money.
The biwire terminals are the legacy of a time when it was a commercial necessity to offer them. Harbeth has never thought it offered any performance advantage. Eventually the terminals will go, but only when the models that still have them are otherwise redesigned and updated (and that doesn't happen very often).
Enjoy your speakers and forget about the connections.