I don't see extra line outputs on the back of that model.
Majik DSM sets the benchmark for all-in-one music players in build and sound quality.
www.linn.co.uk
I see the pre-outs and the speaker (amplified) output. But, nothing else.
That said, complete agreement with
@lovinthehd - Just split your current pre-outs and send one set to your subwoofer.