I don't think phantom power can be delivered through the minijack at all so I think it would be 9volt. I have the same setup (or very similar) to you and when I plug in my at4041s and engage the toggle switch for the mini jack, nothing happens; however when I switch on the 12volt (low) or 48 volt (high), the mics light up and are able to then record.
yours also has xlr inputs, right?