Mackie SP-DSP1 Quick Start Manual - page 6
Additional Main Screen Options
Preset Save/Recall
The SP-Control has the ability to save up to
10 presets in the SP-DSP1 EEPROM. A preset
consists of the following parameters:
Minimum Gain (MG), Gain Range (GR), Noise
Threshold (NT), Noise Range (NR), Attack Time,
and Release Time.
To save or recall a preset, click the arrow
next to the Preset button to select which
preset number to save, then click the Preset
Save or Preset Recall button.
DSP1/2
The SP2400 can support
two SP-DSP1 cards; one for
each zone. Click this button
to toggle control between
DSP1 and DSP2.
Auto Calibration Function
Click on the "SP-Control"
button at the top of the main
screen and a drop-down
menu appears. Select "Auto
Calibration" to begin the Auto Calibration
procedure. This should be performed once the
ambient microphone and the loudspeakers
are in their fixed positions, and the
microphone gain and input levels have been
properly adjusted. For best results, the Auto
Calibration procedure should be performed
when the room noise is at a minimum.
During the calibration, a countdown timer is
initiated at 90 seconds and a progress meter is
displayed. If the algorithm finds that adaptation
improvements are possible, the timer resets to
90 seconds. A typical calibration period is 2-3
minutes. It is advised to monitor the main four
meter levels during calibration to ensure that all
levels are in their target range. If you find that the
microphone and input levels are too low or too
high, you may want to "Abort" the calibration by
selecting the appropriate button and then
readjust the levels accordingly. There is also an
“End & Save” button if the user finds that
calibration is taking too long or music breaks are
causing countdown timer resets.
Once the calibration is complete, the CAL
value will update. At default, this value is +10
(with a range of +20 to –80 dBr). This number
is a measure of how much of the program
material is getting rejected in the environment
that the Auto Calibration was performed. The
closer the number is to +10, the less the
rejection. A CAL value = –15 dBr would be an
excellent rejection value, which would be
expected in a small room. A larger room would
have a CAL value closer to 0 dBr, indicating a
lower rejection due to room reflections.
Any of the user parameters can be adjusted
after the Auto Calibration procedure is
completed (MG, GR, NT, NR, Attack Time,
Release Time). These settings do not affect
the calibration of the SP-DSP1. However, if the
placement of the ambient microphone or
speakers should change for any reason, you
should run the Auto Calibration procedure
again to allow the SP-DSP1 to reevaluate the
room transfer function.
Likewise, if any level
changes are made in the
signal chain after the SP-DSP1
card, the noise sensor
perceives this as an acoustic
noise disturbance, and the
Auto Calibration procedure
should be performed again.
Note that all the level
controls in the SP2400 are
before the SP-DSP1 and have
no effect on the calibration.
Factory Restore
Select Factory Restore from the drop-down
menu to restore all the settings in the SP-
DSP1 to their default values.
Upload/Download From/To EEPROM
Occasionally, it is necessary to backup
SP-DSP1 presets and parameters or to transfer
settings from one DSP to another. To copy the
contents of the EEPROM, simply select
“Upload from EEPROM” from the drop-down
menu. The EEPROM contents are stored in
your Palm. If you would like to copy contents
of the Palm into another SP-DSP1 card, select
“Download to EEPROM.” This will completely
erase the existing contents of the EEPROM
and replace it with what was stored in the
Palm. It is advised that you do an “Upload
from EEPROM” before doing a “Download to
EEPROM” to ensure that the current settings
are saved in the Palm.
6
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Part No. 910-300-20 Rev. A 12/00
© 2000 Mackie Industrial. All Rights Reserved. Printed in the USA.