Amp subsonic filters?

I have the kicker Model KX850.2 on order, does this amp have a subsonic filter? I hear subsonic filter are good if you have a ported box, and I do. is this amp ok to use with a ported box, or do I need to get a subsonic filter? Frequency Response: 20Hz-20kHz; +0, -1dB Input Sensitivity: High Level 340mV-10V, Low Level 170mV-5V Signal-to-Noise Ratio: >95dB, a-weighted, re:rated power Active Crossover: 12dB/Octave, variable 50Hz-200Hz, selectable high pass, low pass, or all pass;KX100.2 hig or low fixed @ 80Hz KICKBass Boost: Variable to +18dB, centered @ 40Hz Pass-Thru RCAs

Hey, That amp does not have a subsonic Filter, and yes its good to use it if you are using a ported box to protect your subs, the subsonic Filter eliminates lower frequencies that we can't hear from being reproduced, saves your amp from wasting a ton of power which makes the amp more efficient and it helps protect your subs (especially in ported enclosures). Here is a Good definition from esmith69