Just finding this thread. To add more detail, the Loki "wall-wart" is actually just a small transformer. If you look on the back of the Loki, the power socket says "16 VAC". This means 16 volts alternating current. The "wall-wart" transformer just reduces the 120V AC down to 16V AC. The rest of the linear power supply is inside the Loki. There have been other electronic devices that are designed this way, but it's very rare. The good thing here is that the transformer is far away from the Loki and will not produce electromagnetic interference inside the Loki.
So, yes, if you connect a 3rd party "DC" linear power supply, bad things could happen.
So, yes, if you connect a 3rd party "DC" linear power supply, bad things could happen.