McIntosh C48 Preamp I presume
A quick glance at the manual: pgs 9, 13, 15 involves complicated options:
1st assigning an unused high level rca input name (i.e. CD2, or SRVR) to the Balanced Input 1 for instance (then plug your direct stream into the C48's bal 1 inputs. When you select CD2 or SRVR (whichever you re-assigned) as the source, it should take whatever in coming in your Bal 1 inputs (in lieu of the CD2 rca in).
PRESUMABLY, whatever you are listening to this way should go out the REC out jacks, you still need to have the name you reassigned as your selected source.
PASS THRU, pgs 9 and 15 describe a method of activating bal 2 inputs as Pass Thru, then you might have a way of using the Rec out or Bal Out to the recorder