HW-K430 sound bar and a very silent sub-woofer

My sound bar is working fine, connected to a Virgin box with optical cable (cos tv doesn't have optical). Sub-woofer completely silent, even tho id-set light on rear is permanently blue, suggesting the two are connected.
have unplugged, replugged, tried pressing the id-set button (resolutely stays blue) but still not a peep.
Any ideas ??

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