Mackie M800 Owner's Manual - Page 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 applications (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 stereo 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 BridgedMono) 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 (because 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 + - (MONO BRIDGE) 800 WATTS 4 OHM LOAD MIN. 400 WATTS CH 2 OHMS LOAD MIN. MONO BRIDGE CH 2 + - SPEAKER OUTPUTS 1 CHANNEL INPUT BAL/UNBAL 120 VAC 60 Hz 1500 WATTS THRU LOW CUT FILTER TYPICAL 35 Hz STAGE MONITOR 100 Hz CONSTANT DIRECTIVITY HORN EQ /AIR EQ 4.5k Hz OFF ON OFF 170 Hz 2k Hz 6k Hz AIR EQ TYPICAL AMP MODE STEREO MONO BRIDGE CAUTION 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. 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 SERIAL NUMBER MANUFACTURING DATE THE FOLLOWING ARE TRADEMARKS/REGISTERED TRADEMARKS OF MACKIE DESIGN INC.: "MACKIE", "FR SERIES", & THE "RUNNING MAN" FIGURE LIMITER OFF ON CONSTANT DIRECTIVITY HORN EQ /AIR EQ OFF ON 4.5k Hz LOW CUT FILTER TYPICAL 35 Hz STAGE MONITOR 100 Hz 2 CHANNEL INPUT TYPICAL TYPICAL TYPICAL 2k Hz 6k Hz AIR EQ OFF 170 Hz THRU BAL/UNBAL 16