How do you high pass your main speakers?

There are a number of ways.
#1Built into the receiver or preamp is one (more of a home theater feature sadly) 

#2 built into the subs (rare) 

#3 external analogue (my choice, JL audio CR-1, wilson sub controller, Bryston makes one or at least did).  
       3a, digital crossover, mini dsp etc (cheap but complicated)

#4 adding the right resister to your wire like a crossover before the speaker  

As for the frequency to highpass? Anything you want. Really anything. I adjust mine from 40hz to 100hz and it all sounds fine. Just listen and see what sounds best. Do the speakers or subs have more detail at 60hz? Most my speakers with 8” drivers I ended up at 60hz. My current speakers with 15” drivers I ended up at 40hz.

Wait I read all the posts lol. You already use a mini dsp? Just set the sub and speakers to the same point with a 24db slope and call it done. 

The cleanest way is a single capacitor around 80 Hz

erik_squires. Please can anyone post a reference so I can calculate the value of this capacitor for different frequencies?