http://www.arcam.co.uk/_ugc/file/avr280e_manual.pdf
If you have the whole Z5500 package you could run the Arcam's optical- or coaxial digital audio output to the corresponding input on the Logitech.
But I'd be careful about letting BOTH the Arcam and the Logictech perform Digital Sound Processing on the sound. DSP's aren't meant to be stacked. My money says the Arcam is better in the DSP department than the Logitech.
If you have just the sub, run the Sub PRE out from the Arcam to the Sub/Center input (adapt it to 3.5 mm) on the Control Center and set the switch to "6 ch direct".
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