I also gave up on getting my DSP subwoofer to work with my AC200/DSP33 setup. Initially when I purchased the sub I thought it was defective until I hooked it up to my 800 series and 500 series systems.

M2.0>ROON: C15/DSP6K
C2.2>ROON: ALLO DIGIONE/DSP5K+D2500x2
W2.2>ROON: C10/DSP33+D2500
R2.0>ROON R: MiniDSP SHD>SCHIIT Freya+(Forkbeard)>3eAudio A7 Mono>>>Apogee Scintilla

Projects. ROON streamer with serial RS232 volume control