Legacy Audio Xtreme XD - Manual (Page 16)

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Freq.: This control will allow you to adjust low frequency information. The
crossover frequency range of the Xtreme HD is 45 - 150 Hz.
Blend: The graph on the back panel of the Xtreme HD illustrates the
effects of the Blend control. Turning the knob counter-clockwise reduces
energy from the subwoofer in the range of 35-50 Hz. Turning the knob
clockwise will increase gain in this area. This can reduce excessive
energy or give more low frequency impact in this range depending on the
setting. This control is very similar to that of a graphic EQ. The 12 O’clock
position is neutral. The center frequency of this control has been carefully
chosen to match the first cancellation node of most rooms.
Phase: This control is essential in the proper setup of your subwoofer. If
not set up properly, your main speakers and subwoofer can actually work
against each other. If operating out-of- phase the subwoofer and mains
will cancel, creating nulls at some frequencies (primarily upper bass).What
is desirable is to have the subwoofer and the mains operating in phase,
relative to the primary listening position. Here is an effective method of
accomplishing this:
Fine Tuning