Best way to Crossover JL Audio F110 into system


I just purchased a JL Audio sub and want to use a crossover to maximize both the sub and my Sonus Faber Olympica III's. I know that JL has a crossover for 3k, but was looking for "better and possibly more economical" way to achieve this. 

Any my feedback would be appreciated. 

Regards,

hambon
It's probably too late, but the better idea would have been to get a stereo pair of E110's and use the crossovers built in.  Nearly identical performance to the same sized Fathoms.
Thanks for the tip. I may look to see if there are any out there. Are there many differences in these?

The excellent First Watt B4 retails for $1500, but Reno Hi-Fi sells it discounted. It provides a lot of flexibility: 1st/2nd/3rd/4th order filters in 25Hz increments from 25Hz to 3200Hz. All discrete components, no Opamps or IC’s.

But if a 6dB/octave filter will suffice, the "cap-on-the-amps-input-jacks" method is the most transparent way to go.

Great feedback bdp24. Sorry for my ignorance but and you explain what you mean buy, "cap-on-amps-input-jacks" method. 

Thanks.