Congratulations You just got 2 of the best subs available.
Its real simple in order to take advantage of this unique design you need a pre amp out witch most all AVR receivers have front out is okay but you need also an AMP in if your unit doesn't have one just get an affordable separate power amp.
the high pass goes into the amps RCA inputs when set correctly will work properly as designed and you will have an awesome bass transition.
Read the well written owners manual
Best JohnnyR