MACKIE M800 - Manual (Page 16)

16
AMP MODE
This three-way switch determines what kind
of amplifier you want the M•800 to be (or not
to be — what was the question?)
The switch alters the input signal routing
within the amplifier. Shipped from the factory, it
is set to
STEREO, correct for about 90% of appli-
cations (hence the TYPICAL indicator near it).
The switch should only be configured when
the amplifer is turned off.
STEREO
This is the typical setup for amplifying ste-
reo signals. There are separate left and right
inputs, and separate left and right outputs. The
two channels are independent of each other.
MONO
This mode (also known as Dual-Mono) is
used to send the same signal to each speaker.
• There are one or two inputs and two
mono outputs.
• You can feed either channel or both.
• The inputs are summed (before the
GAIN controls) and the mix sent to both
amplifier channels.
• The GAIN controls are still independent.
• The speakers are connected as for
normal stereo use.
BRIDGE
In BRIDGE mode (also known as Bridged-
Mono) the two channels of the M•800 are
combined internally and can deliver up to 800
watts into a single 4 ohm speaker.
• There are one or two inputs and one
mono output.
• You can feed either channel or both.
•
CH 2’s GAIN control will have no effect.
• The amplifier channels are internally
combined in series.
• Only one speaker is used and it is
connected in a special way. Read on.
Some examples of using the BRIDGE mode:
• Two M•800s can be used to create a
powerful stereo system, each driving one
speaker.
• You can use one amp to power a mono
system, such a center speaker or PA.
• Multiple M•800s can be used in theater
surround systems, each driving one
speaker.
To use the M•800 in BRIDGE mode:
1. Turn off the power.
2. Set the
AMP MODE switch to BRIDGE.
3. Connect the positive side of the speaker
cable to the CH 1 red (+) binding post.
4. Connect the negative side of the speaker
cable to the CH 2 red (+) binding post.
5. Use only the CH 1 GAIN control.
6. The M•800 black binding posts are unused.
WARNING: In BRIDGE
mode, both connections to
your speaker are live; that
is, neither is grounded
through the chassis (be-
cause the M•800 black
binding posts are not used).
Take great care to read and follow all safety
instructions. The M•800 is capable of up to
85V AC across the speaker terminals.
Note: The calibration scales of the GAIN
control only apply when using 4 ohm speakers.
CH
1
1 CHANNEL
CH
2
SPEAKER OUTPUTS
+
– –
+
MONO BRIDGE
BAL/UNBAL
MONO
BRIDGE
OFF ON OFF ON OFF ON
120 VAC 60 Hz
1500 WATTS
CONSTANT DIRECTIVITY
HORN EQ /AIR EQ
LOW CUT
FILTER
170 Hz OFF
4.5k Hz
6k Hz 2k Hz
AIR EQ
100 Hz
STAGE MONITOR
TYPICAL 35 Hz
TYPICAL TYPICAL TYPICAL TYPICAL
STEREO
(MONO BRIDGE)
800 WATTS
4 OHM LOAD MIN.
400 WATTS CH
2 OHMS LOAD MIN.
THRU
LOW CUT
FILTER
INPUT INPUT
THRU
170 Hz OFF
4.5k Hz
6k Hz 2k Hz
AIR EQ
TYPICAL 35 Hz
CONSTANT DIRECTIVITY
HORN EQ /AIR EQ
CHANNEL 2
BAL/UNBAL
AMP MODE LIMITER
SERIAL NUMBER MANUFACTURING DATE
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
CAUTION
AVIS: RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
THE FOLLOWING ARE TRADEMARKS/REGISTERED TRADEMARKS OF MACKIE DESIGN INC.: "MACKIE", "FR SERIES", & THE "RUNNING MAN" FIGURE
CONCEIVED, DESIGNED, AND MANUFACTURED BY MACKIE DESIGNS INC • WOODINVILLE
WA • 98072 • USA • MADE IN USA • PATENTS PENDING • COPYRIGHT ©1999
100 Hz
STAGE MONITOR