The Three.2 features a 24dB/Octave crossover which acts as a high pass on the front and rear channels, and a low pass for the subwoofer channel. Jumpers inside the Three.2 allow you to bypass the crossover, sending a full range signal to the front and rears, but maintaining a low pass filter on the sub output.
From factory, the crossover module is set at 90Hz, and can be changed by purchasing a 24dB PFM module from our website here: https://www.audiocontrol.com/product/crossover-pfm-modules/
Below is a picture of the Three.2’s circuit board showing the J12 and J13 jumpers and the associated diagrams showing the pin positions for bypass and normal operation. To defeat the crossover, you change both the J12 and J13 jumper caps to the right two pins.
NOTE: The current model Three.2 has a crossover frequency dial and on/off switch right on top of the unit so there is no need to go inside to change jumpers.