As you can with a balanced output to unbalanced input - though you do need to know what the output circuit topology is.What many here don't seam to understand is, You can Perfectly fine connect a unbalanced source to a balanced input.
With the Proper Cabel:
you even get a lot of the benefits like common mode noise rejection from the balanced connection
of cause there is many ways to even improve this,
for example impedance matching or ground lift:
but even without extra resistors the unbalanced to balanced concretion with impedance mismatch is better then unbalanced to unbalanced.
I believe most modern kit (or at least home kit) has hot and cold separately driven and ground referenced - in this case you connect hot to the center RCA pin, and ground to the ring, leaving Cold unconnected.