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DSP MENU DETAILS
Master Volume: Sets the overall subwoofer output in relation to the main speakers. Values
range from -9dB to +9dB, selectable in 3dB increments. The volume should be set to
achieve an even balance between full-range program and subwoofer output.
Preset Choose: Selects one of 3 presets. Preset 1 is optimized for 8" in-wall subs, Preset 2 is
optimized for 10" in-wall subs, and preset 3 is optimized for 12" subs
Crossover Freq: Selects the highest frequency cut-off point to the subwoofer. If you are
using larger main speakers use lower frequencies below 100Hz. A smaller main
speaker will require more reinforcement from the subwoofer, so the crossover
should be set to higher frequencies above 100Hz. A good starting place is the lower
limit of the frequency response of the main speakers.
Crossover Slope: Also known as roll-off, the slope refers to how abruptly the high
frequencies are cut off. The SWA-400 offers 4 slopes from -12dB to -48dB. This
setting refers to how many decibels above the selected Crossover Freq are
attenuated (turned down) per octave. A gradual slope of -12dB allows more bleed of
higher frequencies to pass through the subwoofer. This is useful with smaller or
cheaper main speakers that are less efficient at reproducing bass. Higher slopes are
more effective when used with high efficiency and bigger main speakers that do
produce sufficient bass.
Phase: This puts a slight delay on the signal sent to your subwoofer. Since the main
amplifier drives the main speakers with full-range sound, the main speakers are
reproducing bass frequencies along with the sub. If you have a front firing sub that
is in the same plane as the mains, then the phase can be set to 0°. Down-firing, rear-
ported, or subs placed away from the mains will smear the bass tones and the
frequencies will cancel each other out as they bounce around the room. Try
different settings and walk around your listening area for the optimum setting.
Low Cut: Selects the lowest frequency that the amp will reproduce. This is useful for
smaller subs, 10" and below. Since smaller speakers cannot reproduce extreme low
frequencies, it is best to limit the system to what they can reproduce. This will
maximize the efficiency of the subwoofer system and minimize over-extension and
