Velodyne DIGITAL DRIVEPLUS DD-15+ User Manual - For Manual-Eq Optimization
www.velodyne.com
30 - Digital Drive
PLUS
Series User’s Manual
RECOMMENDED PARAMETER ADJUSTMENT ORDER
FOR MANUAL-EQ OPTIMIZATION
The recommended order for modifying parameters during manual-eQ is described below. As you make changes
observe the frequency response and how the system sounds to you to evaluate the impact of each parameter
change.
For examples of the Manual-EQ optimization process see the Digital Drive
PlUS
User Interface manual.
For manual-eQ optimization:
1. Perform Auto-eQ
PlUS
optimization to get a good baseline to start your manual-eQ optimization. During
the Auto-eQ
PlUS
optimization, note the rolloff frequency and slope of your satellites when the subwoofer
mutes itself. If you miss the mute of the subwoofer during the Auto-eQPlUS process, you can still see it
by pushing the mute button once you are running manual-eQ.
2. Start manual-eQ. Don’t forget to have the Sweep Tone cD playing.
3. Allow the subwoofer and cD signal to sync.
4. Once synced, make sure that you are in the Setup preset. If you want to change a different preset, make
sure you are in that one, but remember that any changes to the preset parameters will no longer be global
as when done with the Setup preset. Because of this, we recommend that you perform your manual-eQ in
the Setup preset.
5. If you missed noting the rolloff frequency and slope of your satellites during the Auto-EQ
PlUS
optimization,
push the Mute button in the Windows Setup Program or on the remote control. Note the rolloff frequency
and slope of your satellites.
6. Examine the results of the Auto-EQ
PlUS
optimization for low-pass crossover frequency, low-pass slope, and
phase.
7. choose to use these settings or adjust to match the values you arrived at from the muting step. Bear in mind
that these settings may not match the measurement of your satellites because Auto-eQ
PlUS
measures and
compares actual averages of the summed subwoofer-to-satellite frequency response. It is worth writing
them down or remembering them in case you change them to match the satellites and find that you cannot
get a smooth and reasonably flat response.
8. Adjust polarity. Some crossover combinations and some equipment require you to invert the polarity of
your Digital Drive
PlUS
subwoofer and you cannot achieve a reasonably flat response unless you do.
9. If you feel that the volume should be changed, do so now.
10.Begin by modifying the crossover frequency, mentally comparing how minimal dips are as well as how
linear the overall response is. Sometimes it is easiest to compare character to either side of the current
setting. leave it at the best setting.
11. Next, change the crossover slope with the same consideration in mind. Leave it at the best setting.
12. Similarly, change the phase. If you have achieved a smooth response but have a large dip at the crossover
still, you should probably start with a setting of 90° as the crossover blend may be in quadrature.
13. Because crossover frequency, slope, and phase are interrelated, it is best to adjust the crossover, slope,
and phase one more time.
14. Now is the time to work the parametric filters to smooth the response. Change to the first page of either the
System Response screen in the TV screen interface or the Frequency Response and Parameters screen
in the windows Setup Program. These are the screens that show the frequency response graph. The
following sub-steps describe adjusting these filters using the Windows Setup Program. If you’re using the
TV screen interface, use the appropriate remote control buttons to adjust the filters instead of the mouse.
a. locate the peaks in the response and order them from largest to smallest.
b. Use your mouse to click the diamond-shaped frequency marker for the EQ filter with the frequency closest to