Does a 2-way active crossover make sense when using a REL sub connected to the amp?

Hi,

Recently at Axpona a couple of the systems that sounded the best to me had active crossovers. I have a Modwright KWA-150 SE power amp, Dynaudio Special 40s speakers and a REL T7/X sub in my system and I was wondering if there'd be any benefit to introducing an active crossover, especially since the REL sub is feed directly from the speakers connectors.

I looked at the Sublime crossovers but they are 3-way designs. The Marchand Electronics XM66 looks very interesting, but I wanted to know first if any of you has had experience using active crossover with REL subs and/or used ME products.