The “Silver” (Silver and Ultra Silver) has been designed for those who love detail. As has already been commented on, with the Ultra silver the top end is extraordinarily detailed without any harshness.
While the “Black range” (Black, Ultra Black and Black Diamond) could be categorised as neutral/ natural the “Silver” would lean more to neutral, detail and extension. The Silver performance sits beyond Black for very good reasons that you will hear.
Note: All Tellurium Q Speaker cables can be Bi-wired by adding an extra cable during manufacture.