What is the minimum download speed required for iTunes Match streaming

I have been very interested by iTunes Match, and I have read much about it. The only thing that I have not been able to find is the minimum bandwidth required to stream music to an iPhone. Specifically, I would be looking to stream to an iPhone 5, as well as an iPhone 4. If there is an official minimum requirement, please let me know. If there is no apple specified speed, I would be interested in what you found to be he minimum speed necessary for smooth streaming.

Thanks,