@philangus thanks, but your answer isn't helpful at all. I've read and watched many reviews. The PreSonus website says this:
The Quantum 2 offers two combo mic/instrument inputs and two combo mic/line inputs, each with a digitally-controlled XMAX preamp and individual +48V phantom power.
So, they make it sound as if it's only setup for DI impedance. Obviously you can stick a 1/4" cable in there and record, but there will be an impedance miss match if it's not able to accept line level signals.
Further more, the manual says:
Microphone inputs. Your Quantum-series interface is equipped with 8/4 digitally controlled PreSonus XMAX microphone preamplifiers for use with all types of microphones. The XMAX design provides a Class A input buffer, followed by a dual-servo gain stage. This arrangement results in ultra-low noise and wide gain control, allowing you to boost signals without increasing noise. The ¼-inch front panel inputs on Quantum can be either line or instrument. By default, they are set to line. These inputs are not switching on the Quantum 2.
So, again, it's reading as if they are not. I've heard a few people say they are, but would like a concrete "YES" from presonus. Thanks