Here are the specs on the 165HRX3, (http://www.focal-america.com/wp-content/uploads/2010/04/165KRX3_Spec.pdf)
I purchased two sets of Focal 165 KRX3 (Set for front and set for back) but found the crossovers that came with them were not flexible so I went with the Audison Bit One Processor. I am using the 6" for my mid/bass and is being pushed with two JL Audio HD 600 dridged to 300watts for each 6". That uses four of the eight channels in the Bit One and the other four is for the highs. That is why I am hooking the tweeter and the 3" mid together and they are being pushed by one JL Audio HD 600 and 150 watts per channel. For the bass I have two JL Audio 12W6 and being pushed by 2 JL Audio HD750's and is set up on Audiocontrol Matrix manual crossovers.
I have been tuning by ear but I want to hear from others to see if I am headed in right direction or something I might have missed.
My thinking is: when I hooked the tweeter and the mid together to act as my highs, because I don't have enough channels to separate and cross them separately. So if I cross the frequency say 1000Hz to 20,000Hz in the Bit One then wouldn't I want to put a resister on the tweeter so it don't get all 1000Hz to 20,000Hz.