Hello tuscans,
The SoundStation IP 4000 was discontinued and has no longer been available for purchase since 08/20/2009
The original Power Supply Part Number was 2200-06686-001 but you will not be able to purchase this from Polycom.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services