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Velodyne Impact-10 Manual

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4 - 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 passing through
an adjustable low-pass crossover before being amplied. 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 o
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/amplier. 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 midbass
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 very minimal power.
Warning:
If the Sub-Out channel signal level from your receiver is too weak, this feature will not operate properly and shut
the subwoofer off while you are listening to it. To correct this, see VOLUME CONTROL section on previous page.
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