Not sure if it'll help but have you tried the 'Stereo' DSP parameter (p11 in the manual) which uses the sub. Since you're only set up as 2.1, it may be that you're on a DSP parameter that doesn't use the sub. In the system DSP5000 speakers would be set as large and wouldn't 'require' the sub in many situations. As the others have said, you might need a computer to adjust these settings.
Brian
Main: G65, MD600 Sooloos, MC200 Roon Core, MS600, 210, 218, UHD722, DSP5200SE, DSP5200HCSE, M6 & DSW.2
System 2: AC200 MS200, WiiM Pro+, M6.
Other: DSP5000 (96/24v1), DSP3300.
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