Looking at the schematic provided by Maxxsonics, I see what the OP's problem is:
The manual shows one polarity on the sketch of the crossover's input terminals, yet the schematic below it shows the complete opposite
The output is
Before you turn your crossover (or amp) into a smoke-generator, I suggest:
Double check your actual tweeter's input for labelled, silk-screened or embossed polarity and channel (Wf/Tw) markings, as manual may have errors on either drawing (top) or schematic (bottom).
If in doubt, try this:
With a DMM on ohms scale, and [font color="red"]Power Off
[/font], from ground (chassis) to first input terminal, note down resistance.
Repeat ground to 2, Gnd to 3, Gnd to 4, all INputs..
The low readings should be negative (aka shielded screen or common GND).
However, the DMM test won't tell you which is Woofer or Tweeter.
Alternatively, you could undo the X-over shell, then trace the terminals to the board.
Negatives should go to ground (unless it's isolated in circuit).
To confirm which is yo 'Wofaah' and 'Tweetah' input, (shell and power back on), touch 2 mono wires from a small output (earphone of CD player, cassette, trannie radio etc) to each input and listen for Woofer bass and Tweeter treble difference.
Hope this helps you.