Subwoofer cut off frequency

[power]

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[power]

I need some help regarding the right cut off frequency for my home theatre. I have a Harman Kardon avr660 copuled to a Jamo sub with a cut off frequency of 40-120Hz and my fronts are wharfedale evo2-30 at 35-28000Hz, wharfedale evo center at 80-28000hz and wharfedale evo2-8 surrounds at 65-2800hz. Seeing that my centre and surrounds cut off at a higher frequency than my fronts do I then set the sub cut off at the centre's lowest frequency to ensure everything that cant be handled by my centre and surrounds is routed to the sub.

Ill appreciate the help.

 

[kinda]

Usually you would set the sub to just accept anything, and then the amp decides what to send it. So the sub would play everything that the amp wasn't sending to the other speakers.

If your amp doesn't have this I'd just set the sub's crossover at just above the highest of the cutoff frequencies you have, then it would be able to accept everything it needed to from the amp.