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Subwoofer Output: In addition to front and rear preamp outputs, the receiver has a non-fading, two-channel subwoofer output on an 8" pigtail. You can adjust the volume of the subwoofer output from -6dB to +6dB in 2dB increments. The subwoofer output's low pass filter can be set to 80Hz, 120Hz or 160Hz. In addition, you can set the high pass filter for the other speakers at 90Hz, 135Hz, 180Hz, 225Hz, or Off.
You can also turn off the internal amp, a feature only found in higher end units