Yes you can, and that may be good in some cases. I prefer the little 1/8 stereo cable though. I just plug one from my mixer to the DR-05. There are cables that go from any format to the 1/8 plug. It's the same size that is used by phones, headphones (not 1/4 inch), computers and other devices.
I record myself on the job. I can critique it on the way home by plugging into my car's system (aux in). I can listen on headphones, or plug it into the PC via USB.
Sometimes it sounds bad everywhere. Then it's time to make some adjustments. Or get better.