Depends on what your current source is and how much better the DAC can be. With a laptop soundcard for example it's wired to use Windows as a volume control, problem with that digital volume control is that setting it far enough below 100% means you're using less than 16-bits (whether that is audible depending on downstream components is debatable, but if possible I'd avoid it), while using it at full volume is possibly deafening, even with an amp that has a volume control to sort of regulate it. And that assumes the signal isn't distorting.
On the basis of a 3.5mm output off a computer not really designed to output to an amp (even on high end motherboards are designed more to drive headphones directly, even with 5.1 outputs), there actually are affordable DACs that in technical terms can (should) do better with detail over the laptop, then you might want to try getting one of these.
What can be more "normal" than one with RCA outputs, given the Magni has RCA inputs? I mean I consider RCA to be "normal" and 3.5mm to be "portable."