Try it. You might experience a minor reduction in volume when they are Y'd together. Connecting this joined connection to the Lepai input should have no further effect.
As both the Dot Line Out and a PC Line Out are meant to drive headphones, their output (source) impedances are both low, and so each unit will see the other's output almost as if a speaker/headphone is connected.
As both the Dot Line Out and a PC Line Out are meant to drive headphones, their output (source) impedances are both low, and so each unit will see the other's output almost as if a speaker/headphone is connected.
