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Impact Series User’s Manual
Low-pass Crossover - 50 to 200 Hz
As noted above, all inputs sum the left and right channels together, with the resulting signal
p
assing through an adjustable low-pass crossover before being amplified. The crossover control
allows you to adjust the upper limit of the subwoofer’s frequency response from 50 to 200 Hz.
The subwoofer’s response will begin rolling off above the frequency you set this control to. You
should set the crossover frequency to obtain a smooth and seamless transition from the
subwoofer to the main speakers in your system. If your main speakers are smaller units with
limited low frequency output, you may wish to choose a higher frequency (such as 100 - 120
Hz) than you would with larger speakers which have greater low frequency output. With larger
speakers, you might start with this control set lower, such as 80 Hz.
Phase Adjustment - 0°/180°
This control allows you to “reverse” the phase of the subwoofer’s output signal 180° to correct
for any possible mismatch and resulting cancellation between the subwoofer and your main
speakers/amplifier. To adjust, simply listen to the system with music playing, then depress the
phase switch from one position to the other and listen for a change in mid-bass frequency
output. The correct position will have a greater amount of apparent mid-bass frequency output.
For all installations, experiment with the phase switch to determine the setting (0 or 180
degrees) that produces the most mid-bass. If the settings sound similar, we recommend the
“0” position.
Auto Turn on Function
The subwoofer will turn itself on automatically when an audio signal is present. If no signal is
present for approximately eight minutes, the unit will switch to standby mode (Red LED). While
in standby mode, your subwoofer will draw ver
y minimal power.
Warning:
If the Sub-Out channel signal level from your receiver is too weak, this feature will not operate
pr
operly and shut the subwoofer off while you are listening to it. To correct this, see VOLUME
CONTROL section on previous page.