Velodyne Digital DrivePLUSSeries - Manual (Page 30)

OPTIMIZATION PARAMETERS EQ
The following table describes the subwoofer EQ parameters that are either automatically configured with Auto-EQ PLUS and/or Self-EQ. All of
these parameters can be manually customized by you using the Manual-EQ method.
EQ Parameter Set with Set with Description
Auto-EQ PLUS Self-EQ
Low Pass Crossover Yes No The upper limit of your subwoofer’s frequency response.
Frequency and Slope The crossover frequency can be set to increments of 1 Hz,
between 40 Hz and 199 Hz or it can be disabled
(-- or OFF). The crossover slope can be set to 6, 12, 18,
24, 30 or 36 dB/octave.
Typically, these parameters are the same for all the
presets however you can choose to vary the values in
the different presets.
For Self-EQ the crossover frequency is set to 160 Hz
with a slope of 24 dB.
The subwoofer crossover frequency can also be changed
by the subwoofer’s front panel control. Please note that this
type of change is temporary until you change it and save it
to the DD+ using either the TV or Windows interface.
Subsonic Filter No No Sets your subwoofer’s lowest frequency limit in
Frequency and Slope increments of 1 Hz between 15 Hz and 35 Hz.
The subsonic filter slope can be set to 6, 12,
18 or 24 dB/octave.
Usually, the subsonic filter doesn’t need to be changed from
its default of 15 Hz with a steep roll off of 24 dB. The default
settings provide the maximum protection at the widest
bandwidth. Increasing the crossover frequency protects the
subwoofer more; lowering the slope protects it less.
If your subwoofer isn’t adequately protected at very low
frequencies, you can blow up the subwoofer’s amplifier or
cause other damage that requires subwoofer replacement,
which are very expensive repairs.
It is easier to overdrive the subwoofer at these low
frequencies because you can’t hear these frequencies.
Warped vinyl records can have unexpected output at very
low frequencies and damage the subwoofer. Some CD’s
are made without filtering this part of the signal out.
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Digital Drive PLUS User’s Manual OPTIMIZATION