does anyone use subwoofers in their setup?

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Having said that, there may also need to be a delay adjustment to cater for the phase difference between the main speakers and the sub-woofer at the cross-over frequency. There's an interesting article about this here: http://www.rythmikaudio.com/phase1.html.

So probably you need to measure the response and play around a bit with the delay to get the best result. Good luck - I would be interested to hear how you get on as I need to do something similar when time allows.