Velodyne DIGITAL DRIVEPLUS DD-15+ User Manual - page 35
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Digital Drive
PLUS
Series User’s Manual - 29
OPTIMIZATION PARAMETERS
Parametric
The following table describes the three parameters of the eight EQ filters that can be adjusted during the
optimization process of the Digital Drive
PlUS
subwoofer. The parametric filters can help you to achieve better
room equalization. Although the Auto-eQ
PlUS
and Self-eQ optimization processes automatically adjust the level
of the preset parametric filters, only the Manual-EQ allows adjustment of the frequency and bandwidth, as well
as level of these filters.
The parametric filters should be adjusted after the system parameters have be set.
During the manual-eQ process, remember that all of the preset parameters are available for adjustment. At this
time, you can customize each preset to get the appropriate character for use with differing satellites or media
depending on your needs and system complexity
EQ Setting
Set with
Self-EQ
PLUS
Set with
Auto-EQ
PLUS
Set with
Manual-EQ
Description
Frequency (F) no
no
yes
The center frequency for the parametric filter. The
parametric filters should be placed at peaks and
valleys in the frequency response during manual-eQ
optimization. You should put a filter at the highest
peak first and adjust the filter levels before proceeding
to put filters at the next highest peak. You should put
filters at the peaks before putting filters at valleys.
Remember that you are using up amplifier headroom
when you raise a dip, so it is better to lower a peak.
When manually setting the filter frequencies, avoid
putting more than one filter at one frequency. The
filters can be close, but if you find that you need to
stack the filters at one frequency, you have probably
placed the subwoofer or microphone in a poor
location in the room near or at a null. To correct for
this ReSeT the subwoofer using the remote, move the
location of the subwoofer or mic and start over with
the Auto-eQ
PlUS
optimization and then proceed back
into manual-eQ.
The default parametric filters are at the 1/3 octave ISO
frequencies: 20 Hz, 25 Hz, 32 Hz, 40 Hz, 50 Hz, 63 Hz,
80 Hz and 100 Hz.
level (l)
yes
yes
yes
The filters can be adjusted in level between +6 dB and
-13 dB. The default level is 0 for all filters.
Bandwidth
(Q)
yes
yes
yes
The bandwidth determines how narrow the parametric
filter is. The narrower the filter, the higher the Q value and
the faster the roll off on each side of its center frequency.
The default Q setting for the bandwidth is 4.3 The Q can
be set between 0.1 and 20. The Q or bandwidth of the
filter is usually adjusted last after correctly setting the
frequency and level. It is adjusted so that as little around
the dip or peak being corrected is affected.