The signal seems a bit weak out of the DSP-30. What could be the culprit?
The DSP-30 might be configured that way, with insufficient gain or less-than-optimum filtering in the signal paths. Use Signal Manager to check and if necessary, correct the situation. The DSP-30’s inputs and outputs are active balanced. But if you run unbalanced interconnections between it and the other audio equipment, make sure that you use the non-inverting input and output terminals (pin 2) for the signal connection, and connect the inverting terminals (pin 3) to ground. You could lose some signal level if you don’t do it correctly.
