Velodyne DD-10+ - Optimization Parameters; Parametric

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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 lters that can be adjusted during the
optimization process of the Digital Drive
PLUS
subwoofer. The parametric lters 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 lters, only the Manual-EQ allows adjustment of the frequency and bandwidth, as well
as level of these lters.
The parametric lters 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 diering 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 lter. The
parametric lters should be placed at peaks and
valleys in the frequency response during Manual-EQ
optimization. You should put a lter at the highest
peak rst and adjust the lter levels before proceeding
to put lters at the next highest peak. You should put
lters at the peaks before putting lters at valleys.
Remember that you are using up amplier headroom
when you raise a dip, so it is better to lower a peak.
When manually setting the lter frequencies, avoid
putting more than one lter at one frequency. The
lters can be close, but if you nd that you need to
stack the lters 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 lters 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) Ye s Yes Yes The lters can be adjusted in level between +6 dB and
-13 dB. The default level is 0 for all lters.
Bandwidth
(Q)
Yes Yes Yes The bandwidth determines how narrow the parametric
lter is. The narrower the lter, the higher the Q value and
the faster the roll o 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
lter 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 aected.