riporto da manuale SVS
Line Level Inputs
These inputs are used for line level connections to the subwoofer. For a single
mono connection to an A/V receiver, use the R/LFE input. For 2-channel
applications, use both the L and R inputs.
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Phase Control
This control delays the signal being processed through the amplifier. For
connection to an A/V receiver, it should be set to 0 degrees. For 2-channel
applications, it should be adjusted to obtain the most coherent and stable
soundstage and transition between the loudspeakers and the subwoofer.
Low Pass Filter
This control affects the upper frequency limit of the subwoofer. The control
range is 50-160 Hz, along with a disable (LFE) setting. The slope of the low
pass filter is 12 dB/octave. For connection to an A/V receiver, the low pass
should be set to LFE (i.e., disabled). For 2-channel applications, it should be
adjusted to blend with the natural roll-off frequency of your loudspeakers. The
manufacturer’s rated bass extension for your loudspeakers is a good starting
point, but final blending is best done by ear.