Here are the specs on the HU (crutchfield is good for something)...
Crossover (XOver):
Front High Pass Filter:
Center Frequency: 30Hz, 40Hz, 50Hz, 60Hz, 70Hz, 80Hz, 90Hz, 100Hz, 120Hz, 150Hz, 180 Hz, 220Hz, 250Hz, or Through (no filter)
Slope: 12dB/Oct, 18dB/Oct, or 24dB/Oct
Rear High Pass...