This power supply has been tested with the Logitech Pure-Fi  Express Plus Speaker Alarm Clock for ipod Dock. 

1000 mA Regulated Switch Mode Plug-in Power Supply with 7 Output Voltages and 8 DC Interchangeable Plugs. Now including 4.0 x 1.7 and 2.35 x 0.75 plugs, for use with a host of modern portable appliances.