http://en.wikipedia.org/wiki/Audio_crossoverI'll try to be more specific and describe all the controls on the front of the amp.
The amp has a "low filter cutoff" button which is an on/off button.
The amp has a "high cuttoff frequency" knob that can be set from 40 to 160hz. This setting has an on/off button switch to disable it.
The amp has a volume knob ranging from min to max. This controls the overall output level.
It also has a power led, a signal led, and a red led to indicate clipping.
The reccommended settings are,
Games - Low cutoff switch ON, High cutoff switch ON, High cutoff frequency knob set to 40hz
Music - Low cutoff switch ON, High cutoff switch OFF, High frequency cutoff knob disabled by high cutoff switch
Movies - Low cutoff switch OFF, High cutoff switch ON, High cutoff frequency knob set to 80hz
By analyzing the above settings you can get an idea what frequencies it tries to reproduce. Generaly speaking, the frequencies are well below that which the average subwoofer or headphones is capable of.
So I guess in games you would get something like 10 to 40hz, movies 10 to 80hz, and music something like 10 to 250hz.
Ok, bear with me as I type from the manual.
High and Low cutoff filters
The Low Cutoff filter is designed to signifcantly reduce (12db per octave rolloff) the extremely low frequencies, those below 25hz. This is the subsonic range, below the frequencies the we can hear with our ears. In movies and games, this is usually where large explosions will shake you. However, often in music, this is a dead zone mostly filled with noise. Switching on the Low Cutoff filter will lower the intensity of these low frequency vibrations.
The High Cutoff filter is designed to reduce and eliminate the frequencies in the upper range of the buttkicker gamer's response. This can be used to put a "ceiling" on the frequency response of the buttkicker gamer to help eliminating unwanted "buzzing" and the occasional human voice that may be transfered in the upper frequency range of the buttkicker gamer. To eliminate unwanted effects, turn on the high cutoff filter and starting from the highest frequency, turn the high cutoff frequency knob down untill you achieve the desired effect. When active, lowering the high cutoff frequency can also help to reduce the response to in-game music without significantly reducing the low end effects.
The buttkicker specs as per the manual,
Buttkicker gamer - frequency response 10-250hz, 2ohm impedance. Weight 2 lbs 2oz.
The Amp - 100 watts 10 lbs 2oz.