Mackie SP-DSP1 User manual

Safety First!
Before installing the SP-DSP card, please
read thisQuick-Start Guide carefully and keep
it for future reference.
CAUTION!This circuit board is
static sensitive, and is packed in
an anti-staticbag. Please use
anti-static precautions when
handling theSP-DSP card, such asthe use of
an electrically grounded wrist band and anti-
static mat.
WARNING!These servicing
instructions are for use by
qualified personnel only.To
avoid electricshock, do not
perform any servicing other than that
contained in the Operating Instructions
unless you are qualified to do so. Refer all
servicing to qualified service personnel.
Makesurethe power isoff and the powercord
disconnected before removing the top cover to
gain access to the inside ofthe SP2400.
Mackie Industrialstrongly recommends that
this circuit board be installed only by a
professionaltechnician, sound installer, or
contractorwithelectronicservicingexperience.
1. Never open the SP1200/SP2400 with the
power supply on.
2. After installingtheSP-DSP1card,andbefore
applying power to the SP1200/SP2400,
make sure the cover is properly installed
and that no wires are pinched between the
cover and chassis.
The SP-DSP1 is a
real-time digital
signal processor that
can be installed in
the SP1200 or
SP2400. It uses a
proprietary algorithm
to sense noise in a
room and adjust the
gain of the program
source accordingly.
This unique approach effectively"nulls out"
the music sensed at the ambient microphone,
allowing the DSP to measure the actual
ambient noise level in the room. As the noise
level increases, the gain of the music
automatically increases to compensate for the
increased noise.
TXD
L/R
RXD
GND
+5V +5V
GND
+5V
J4
DSP
EEPROM
J3
J1
U13
U16
U14
U12U8
U9
U3
U4
U1
U11
U7
U5
U10
U6U2
U15
U17
U18
J2

Installing the SP-DSP1 Card
Note: These instructions describe how to install oneSP-DSP1 into the Zone A side of theSP2400.
A secondSP-DSP1 may be installed in the Zone B side. The instructions for Zone B are the same
unless otherwise indicated.
Install SP-DSP1 Board
4. Using a pair ofneedlenose pliers,
carefullyremove the jumper from J4 pins
10 and 11 on the Filter board (rear of unit,
closest to the bottom).
RISK OF FIRE! REPLACE WITH FUSE AS MARKED
MACKIE DESIGNS. ™
© 2000
®
055-286-00 RE :__
SP2400:SOFT START
R1
C1
C3
R4
R3
R6
D1
F1
J3
J1
J4
J2
J8
J5
J11
J14
J9
J6
J10
J7
J13
J12
D2
JP1
R5
K1
R2
C2
4A SB 250
+
BROWN
BLUE
SP2400 AMP-1 BOARD SP2400 AMP-1 BOARD
J5
R110 R67
R68
C11
C62
J4
J6
J1
1
2
3
1
2
3
1
2
3
J9
C9
JP1 JP2
C7
C1 C2 C3 C4 C5 C6
C8 C10
C17 C18
C15
1
2
3
J3
3
2
1
J2
J11 J15 J10
1
2
3
1
2
3
1
2
3
J5
R110 R67
R68
C11
C62
J4
J6
J1
1
2
3
1
2
3
1
2
3
J9
C9
JP1 JP2
C7
C1 C2 C3 C4 C5 C6
C8 C10
C17 C18
C15
1
2
3
J3
3
2
1
J2
J11 J15 J10
1
2
3
1
2
3
1
2
3
SP2400 INPUT BOARD
S3
J7
J1B J1A
J6
J2 J3
ONOFF
F1 F2
–18 +18
S4 J8 J9 J10 J11 J12 R263
R262
R261
S5
J5J4
J13
S1 S2
12345678
ON
12345678
ON
SP2400 AMP-2 BOARD SP2400 AMP-2 BOARD
SP2400 POWER SUPPLY BOARD
REAR PANEL
FRONT PANEL
TXD
L/R
RXD
GND
+5V +5V
GND
+5V
J4
DSP
EPROM
J3
J1
U13
U16
U14
U12U8
U9
U3
U4
U1
U11
U7
U5
U10
U6U2
U15
U17
U18
J2
SP-DSP1
REAR PANEL
Remove cover.
1. Remove 12 screws from the top ofthe
cover using a #2 Phillips-head screwdriver.
These screws are all one size.
2. Remove the front rackmount bracketsand
rear support brackets by removing three
screwsper bracket. These screws are all
one size.
3. Remove two additional screws on each
side of the unit.These screws are all one
size.
Note: Remember which screws are used for
the top, brackets, and sides so that you can
properly reinstall the top cover.
L10
SP2400 FILTER BOARD
Remove Jumper and
Install Ribbon Cable (040-470-00)
J6
J3
J4 J5
J10
J11
1
2
3
C91
R147
R132
L9 J9J8
L7
L5
L3
L6
R145
U25
S2
R146
R127 R128 R129
R131
R149R148
C92C93
C94 C95 C96
R142
R143
R133 R134
C89
R136
R137
R150
R96
R121 R97
5. Install the ribbon cable (040-470-00) onto
J4. Make sure the tab on the connector
lines up with the notch in the socket.
2

6. Snap the square end ofthe four nylon
standoffs into the four square holes on the
input board. Avoid flexing the circuit board
by supporting the outer edge of the board
while pressing down on the standoffs.
Install Power S pply Expansion
Board
10. Remove two screws from the main Power
Supply board, nearest the front of the unit.
Place the PowerSupply Expansion board
so the angle brackets align with the holes
on the power supply. Reinstall the screws
through the holesin the angle brackets
and the main Power Supply board.
L10
SP2400 FILTER BOARD
J6
J3
J4 J5
J10
J11
1
2
3
C23
C54
C40
D22
J1
J2
D3
C91
R147
R132
L9 J9J8J7
L7
L5
L3
L6
L4
L2
R145
S1
Q1
U25
S2
R146
R127 R128 R129
R131
R149R148
C92C93
C94 C95 C96
R142
R143
R133 R134
C89
R136
R137
R150
R96
R121 R97
3
B J1A
S4 J8 J9 J10 J11 J12 R263
R262
R261
S5
J5J4
J13
S1 S2
SP2400 INPUT BOARD
REAR PANEL
12345678
ON
12345678
ON
STANDOFFS
7. Place the SP-DSP1 circuit board on top of
the four standoffsso the four holes in the
DSP board align with the standoffs. The
large square multi-pin integrated circuit
should be on the right side of the board
when facing the front of the unit. Make
sure the ribbon connector (from step 5) is
sticking straight up so that it clears the
front edge ofthe DSP board.
L10
SP2400 FILTER BOARD
J6
J3
J4 J5
J10
J11
1
2
3
C23
C54
C40
D22
J1
J2
D3
C91
R147
R132
L9 J9J8J7
L7
L5
L3
L6
L4
L2
R145
S1
Q1
U25
S2
R146
R127 R128 R129
R131
R149R148
C92C93
C94 C95 C96
R142
R143
R133 R134
C89
R136
R137
R150
R96
R121 R97
3
BJ1A
S4 J8 J9 J10 J11 J12 R263
R262
R261
S5
J5J4
J13
S1 S2
SP2400 INPUT BOARD
REAR PANEL
12345678
ON
12345678
ON
STANDOFFS
TXD
L/R
RXD
GND
+5V +5V
GND
+5V
J4
DSP
EEPROM
J3
J1
U13
U16
U14
U12U8
U9
U3
U4
U1
U11
U7
U5
U10
U6U2
U15
U17
U18
J2
SCREWS
8. Insert the four 1" screws through the holes
in the top of the DSP board and into the
four standoffs. Use a #1 Phillips-head
screwdriver to secure the screws into the
standoffs.
Warning: Do not pressdown while tightening
the screwsor you could inadvertently crack
the Input board. Use one hand to support the
Input board from the bottom while tightening
the screw with the other hand.
9. Connect the ribbon cable from J4 on the
Filter board to J1 on the DSP board. Make
sure the tab on the connector lines up
with the notch in the socket.
RISK OF FIRE! REPLACE WITH FUSE AS MARKED
MACKIE DESIGNS. ™
© 2000
®
055-286-00 RE :__
SP2400:SOFT START
R1
C1
C3
R4
R3
R6
D1
F1
J3
J1
J1
J4
J2
J8
J5
J11
J14
J9
J6
J10
J7
J13
J12
D2
JP1
R5
K1
R2
C2
4A SB 250
+
BROWN
BLUE
J2
TO POWER
TRANSFORMER
TO DSP BOARD
11. Locate the pair of blue wires exiting the
toroidaltransformer thataren’tconnected to
anything. Plug the connector on the end of
the blue wiresinto the two-pin connector
(J1) on the Power Supply Expansion board.
Thelip on the connectorfacesthetab on J1.
12. Connectone end of the 3-conductor cable
that came with the SP-DSP1 kitto J2 on
the PowerSupply Expansion board.
Connectthe other end of the cable to J2
on the DSP board. Route the cable
between the two heatsinks.
Connect the COMM PORT
13. Connectthe 9-conductor cable that came
with theSP-DSP1 kitto J4 on the LED
board. On the other end of the cable,
connectthe 5-wire 5-pin connector to J4
on the Zone A DSP board. Connect the 3-
wire 5-pin connector to J4 on the Zone B
L10
SP2400 FILTER BOARD
J6
J3
J4 J5
J10
J11
1
2
3
C23
C54
C40
D22
J1
J2
D3
C91
R147
R132
L9 J9J8J7
L7
L5
L3
L6
L4
L2
R145
S1
Q1
U25
S2
R146
R127 R128 R129
R131
R149R148
C92C93
C94 C95 C96
R142
R143
R133 R134
C89
R136
R137
R150
R96
R121 R97
S3
J7
J1B J1A
J6
J2 J3
F1 F2
–18 +18
S4 J8 J9 J10 J11 J12 R263
R262
R261
S5
J5J4
J13
S1 S2
REAR PANEL
12345678
ON
12345678
ON
SP2400 INPUT BOARD ZONE B POSITION
TO POWER SUPPLY
EXPANSION BOARD TO LED BOARD
STANDOFFS
TXD
L/R
RXD
GND
+5V +5V
GND
+5V
J4
DSP
EEPROM
J3
J1
U13
U16
U14
U12U8
U9
U3
U4
U1
U11
U7
U5
U10
U6U2
U15
U17
U18
J2
J2 J4
Connect Ribbon Cable to J1
3

DSPboard (leave disconnected if installing
only one DSP card). Route the cable
between the two heatsinks.
TO DSP BOARD
FRONT PANEL
LED BOARD
TO CPU BOARDS
J4
Reinstall the Top Cover
14. When placing the top cover back onto the
chassis, be sure all the wiring is properly
routed between and beside the heatsinks
to avoid pinching the wires between cover
and chassis. Replace the screws in the
same order in which they were removed.
Using the SP-DSP1 Card
It isimportant to understand that the
SP-DSP1 does not add gain to the signalpath,
but rather attenuatesthe signalat its input by
a user-adjustable amount, and then applies
less attenuation to the signalto achieve an
increase in volume as determined bythe
Ambient NoiseSensing Algorithm.
The defaultMinimum Gain setting is –40 dB,
so the signallevel is 40 dB lower with the
SP-DSP1 card installed than it is withoutthe
card installed (or with the circuit bypassed).
At first, you may wonder why the signallevel is
so low when you first turn on theSP2400
because of this additionalattenuation.
However, after the parameters are properly
adjusted andyou run the Auto Calibration
procedure, theSP2400 will operate with
sufficientvolume.
Note: TheSP-DSP1 requiresconnecting a
microphone to the AMBIENT MICconnection
on the rear panelof the SP2400. We
recommend using the Mackie Industrial
MT-3100 omnidirectional condenser
microphone. However, if the installer
determines thata directional microphone is
better suited to the application, such as the
Mackie Industrial MT-3200 semi-cardioid
condenser microphone, it may be used as well.
Be sure to move the AMP ADDRESS switch
#8 up to activate the ambientmicrophone.
Installing the Software
The SP-DSP1 isdesigned to run under the
Palm™ OS.The SP-Control™ Palm
application isincluded on a 3.5" floppy disk,
and it can also be downloaded from the
Mackie Industrial website
(www.mackieindustrial.com).
Copy the "SP-Control.prc" file from the
floppy diskto the hard drive on your computer
where the Palm Desktop Application is
installed. Double-click on the "SP-Control.prc"
file, and the "Install Tool" dialog box opens to
let you know that the file will be installed on
your handheld Palm the next time you
perform a HotSync operation.
Using the SP-Control Application
Once the "SP-Control.prc" file hasbeen
installed on the Palm, you can connectthe
Palm to the COMM PORT on the SP2400. Use
the supplied 9-pin “null-modem” adapter
between the Palm’s HotSync cable and the
SP2400’s COMM PORT.This switches pins 2
and 3 (RXD and TXD) on the RS-232
connection so the two devices can
communicate properly.
Select the "SP-Control" application on the
Palm to launch it, and the main SP-Control
window appearson the screen. Click the
“Connect” box to begin communication
between the application and the SP-DSP1.
There are sixuser-adjustable parameters and
four bar graphsindicating relevantlevels.
4

AdjustableParameters
MG (Minimum Gain)
This control defines the lowest level to
which the system can attenuate the program
signal. Ithas a minimum setting of –40 dB
and a maximum setting of0 dB.
GR (Gain Range)
This control defines the amount of gain
change allowed by the Automatic Level Control.
It hasa minimum setting of 0 dB and a maxi-
mum setting of 40 dB. The Gain Range setting
can never be greater than the Minimum Gain
setting, because the system gain from the
input to the output ofthe SP-DSP can never be
greater than 0 dB. Because of this, the Gain
Range control “re-scales” itselfif the Mini-
mum Gain controlis increased toward 0 dB.
As an example of how these controls work
together, ifthe user wanted his music levels
to operate in a range ±10 dB around –15 dB
down from the input level, he would set
MG = –25 dB and GR = 20 dB.
NT (NoiseThreshold)
This control sets the pointat which the
noise level “triggers” the Automatic Level
Control to begin working. It hasa minimum
setting of –80 dB and a maximum setting of 0
dB. The lower the Noise Threshold setting, the
more sensitive the algorithm is to ambient
noise levelsin the room.
NR (Noise Range)
This control adjuststhe ratio of how much
the program levelchanges as a function of
how much the noise level changes. It hasa
minimum setting of 1 dB and a maximum
setting of 60 dB.
For example, ifyou set the Noise Range to
20 dB and the Gain Range to 30 dB, then a 20
dB change in the noise levelcauses a 30 dB
change in the program output level (assuming
the noise levelhas crossed the Noise
Threshold).These settings representa 2:3
noise level to program level change. For every
2 dB change in noise level, the output level
changes by 3 dB. However, if you accept the
default settings of NR = 40 dB and GR = 40
dB, the settings represent a 1:1 noise level to
program levelchange. For every 1 dB change
innoise level, the outputlevelchanges by1 dB.
AttackTime and Release Time
The Attack parameter defines the time, in
seconds, ittakes for the Program Gain to
increase by40 dB. Likewise, the Release
parameter defines the time ittakesfor the
Program Gain to decrease by 40 dB.These
parameters have a maximumvalue of 300
seconds(5 minutes). A short AttackTime
allows the program level to respond to every
shift in noise level. Increasing the AttackTime
allows the algorithm to “average” the noise
level and provide a relativelyconstant
Program Gain over time.To keep impulsive
bursts of noise from affecting the program
level, a good setting might be Attack = 20
secondsand Release = 20 seconds.
BarGraphs/Metering
PI (Program Input)
This indicates the input level into the DSP.
It is importantthat the Program Inputsignal
level issufficient prior to running the Auto
Calibration procedure.The input level should
be between 0 and –10 dB during the loudest
portions of the program material. Adjust the
level with the frontpanel up/down buttons.
MI (Microphone Input)
This indicates the ambient microphone
input level into the DSP. Again, itis important
that the ambient microphone signallevel is
sufficient prior to running the Auto Calibration
procedure.The input levelshould be between
0 and –10 dB for the loudest noise plus
program expected.
It maybe necessaryto adjust the gain of
the ambient microphone. A good way to set
the MI level isto clickthe “Bypass” boxon the
main screen. You may need to turn down the
program levelif there is a lot ofattenuation
set with the Minimum Gain (MG) control, or the
music will becomevery loud in bypassmode.
There is a trim potlocated through an un-
marked hole just above the AMBIENT MIC
connector on the rear panel of theSP2400.
Use a nonconductive alignment tool to adjust
the pot untilthe meter indication is between
0 and –10 dB for the loudest noise plus
program expected.
PG (Program Gain)
This indicates the amountof gain the algo-
rithm applies to the program input.This can
never exceed the Minimum Gain (MG) setting.
PO (Program Output)
This indicates the output level from the
SP-DSP1.The Program Output is equal to the
Program Input (PI) level plus the Program
Gain (PG).
5

AdditionalMainScreenOptions
PresetSave/Recall
The SP-Control hasthe 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), AttackTime,
and ReleaseTime.
To save or recall a preset, click the arrow
next to the Preset button to select which
preset number to save, then clickthe 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 ofthe 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 levelshave been
properly adjusted. For best results, theAuto
Calibration procedureshouldbe performed
when the room noise is ata minimum.
Duringthe calibration,a countdown timer is
initiatedat 90 secondsanda progressmeter is
displayed.Ifthe algorithmfinds thatadaptation
improvementsarepossible,the timerresets to
90seconds. A typicalcalibrationperiod is2-3
minutes.It isadvisedto monitor themain four
meterlevels duringcalibration to ensurethat all
levelsare in their targetrange.If youfind thatthe
microphoneand inputlevels are too low or too
high, you may wantto "Abort" the calibration by
selectingthe appropriatebutton and then
readjustthe levels accordingly.Thereisalso an
“End& Save”button ifthe user findsthat
calibrationistakingtoo long or musicbreaksare
causingcountdown timerresets.
Once the calibration is complete, the CAL
value willupdate. At default, thisvalue 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 CALvalue = –15 dBr would be an
excellent rejection value, which would be
expected in a small room. A larger room would
have a CALvalue 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, AttackTime,
ReleaseTime). These settingsdo not affect
the calibration ofthe SP-DSP1. However, if the
placementof the ambient microphone or
speakersshould change for any reason, you
should run the Auto Calibration procedure
again to allow theSP-DSP1 to reevaluate the
room transfer function.
Likewise, if any level
changes are made in the
signalchainafter theSP-DSP1
card, the noise sensor
perceives this asan acoustic
noise disturbance, and the
Auto Calibration procedure
should be performed again.
Note that all the level
controlsin the SP2400 are
before theSP-DSP1 and have
no effect on the calibration.
Factory Restore
Select Factory Restore from the drop-down
menu to restore all the settings in theSP-
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. Ifyou would like to copy contents
of the Palm into anotherSP-DSP1 card, select
“Download to EEPROM.” This will completely
erase the existing contents of the EEPROM
and replace itwith 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
[e-mail]
www.mackieindustrial.com
16220Wood-RedRoadNEWoodinville,WA 98072
TEL[phone],FAX [phone]
UK+44.1268.570.808,FAX [phone] [email protected]
ITALY+39.0522.354.111, FAX [phone][email protected]
FRANCE+33.3.8546.9160,FAX [phone] [e-mail]
GERMANY+49.2572.96042.0, FAX [e-mail]
Part No.910-300-20 Rev.A 12/00
© 2000 Mackie Industrial. All Rights Reserved. Printed in the USA.