I have previously tried a DacMagic with my Olive 03 and it worked with no problem, but I didn't really think any improvement was that noticeable.
The Olive only has a USB 1.1 output.
Just tried the DacMagic Plus but the connection from the Olive produces no output from the Dac. USB from my Mac is fine, as are other digital inputs and the sound, eg from my Roksan Kandy CD player, is certainly improved.
Has anyone successfully used the DacMagic Plus with the Olive 03?