Low Cut Filter - Mackie M-800 Owner's Manual And Warranty Registration
Fr series fast recovery high-current power amplifier
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Also See for M-800:
- Hook-up manual (4 pages) ,
- Brochure (8 pages) ,
- Service manual (22 pages)
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1/4" TRS INPUT jacks as THRU jacks. Simply
connect the 1/4" TRS INPUT jacks on the first
amplifier to the TRS 1/4" INPUT jacks on the
second amplifier using 3-conductor shielded
cables with TRS plugs on both ends.
nections of your first amp by grounding pin 3.
LOW CUT FILTER
Every woofer has frequency response speci-
fications. It's usually expressed in Hertz (or
cycles per second), like "40Hz–300Hz." The
"40Hz" refers to the low-frequency point (usu-
ally, but not always) where the speaker's
output drops by 3 dB, and will "roll off" com-
pletely as the frequency goes down. There is no
point in sending a woofer any frequencies it
can't reproduce — you can't hear it, and worse
yet, it's a waste of amplifier power that can be
better used reproducing frequencies you can hear.
5
dB
0
dB
–5
dB
–10
dB
–15
dB
1
Hz
L
Low Cut Filter Frequency Response
(MONO BRIDGE)
800 WATTS
4 OHM LOAD MIN.
400 WATTS CH
2 OHMS LOAD MIN.
MONO
BRIDGE
1
CHANNEL
CH
CH
1
2
+
+
–
–
SPEAKER OUTPUTS
14
You can use the THRU jack
as an input, if necessary,
since it's wired in parallel
with the other input con-
nectors.
You can also use the
Warning: If you are using a
balanced input to the first
amp, do not use TS unbal-
anced connections to feed
other amplifiers. This will
unbalance the input con-
10
100
Hz
Hz
Frequency, Hz
C
Fil
120 VAC 60 Hz
1500 WATTS
INPUT
LOW CUT
FILTER
TYPICAL
35 Hz
BAL/UNBAL
OFF
THRU
In order to match the output bandwidth with
your particular speaker system, the M•800 am-
plifier has a tunable LOW CUT FILTER. The
frequencies are clearly marked along the knob's
travel:
• Fully counterclockwise, the frequency is be-
low 10Hz, effectively bypassing the filter.
• Center detent is 35Hz, labeled TYPICAL,
since few woofers actually go below that.
• 3/4 of the way up is labeled STAGE
MONITOR, 100Hz, perfect for, well,
stage monitors (they seldom reproduce
below 100Hz; besides, it prevents low fre-
quency "leakage" into the house).
• Fully clockwise is labeled 170Hz.
So, grab your woofer's spec sheet and find
the low roll-off spec. Then set the M•800's
LOW CUT FILTER at the same frequency.
If you do this correctly (and make sure the
meters are happy), you'll never again see your
woofer moving sporadically without audible
signal. Your system will play louder and
cleaner, and you may never blow another
1k
10k
20k
Hz
Hz
Hz
woofer again!
CONSTANT DIRECTIVITY
AMP MODE
HORN EQ /AIR EQ
STAGE
4.5k Hz
MONITOR
100 Hz
OFF ON
STEREO
MONO
2k Hz
170 Hz
6k Hz
AIR EQ
TYPICAL
TYPICAL
LOW CUT
FILTER
TYPICAL
35 Hz
STAGE
MONITOR
100 Hz
OFF
170 Hz
CAUTION
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.
RISK OF ELECTRIC SHOCK
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
DO NOT OPEN
AVIS:
RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
CONCEIVED, DESIGNED, AND MANUFACTURED BY MACKIE DESIGNS INC • WOODINVILLE
WA • 98072 • USA • MADE IN USA • PATENTS PENDING • COPYRIGHT ©1999
THE FOLLOWING ARE TRADEMARKS/REGISTERED TRADEMARKS OF MACKIE DESIGN INC.: "MACKIE" , "FR SERIES" , & THE "RUNNING MAN" FIGURE
CONSTANT DIRECTIVITY
LOW CUT
LIMITER
HORN EQ /AIR EQ
FILTER
TYPICAL
35 Hz
STAGE
4.5k Hz
MONITOR
OFF ON
OFF ON
100 Hz
2k Hz
6k Hz
OFF
170 Hz
AIR EQ
TYPICAL
TYPICAL
SERIAL NUMBER
MANUFACTURING DATE
2
CHANNEL
INPUT
BAL/UNBAL
THRU
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