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 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. 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 connections of your first amp by grounding pin 3.

In order to match the output bandwidth with your particular speaker system, the M•800 amplifier 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.

LOW CUT

FILTER

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” completely 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.

5dB

dB

0dB

Level,

–5dB

 

 

–10dB

 

–15dB

1Hz

10Hz

100Hz

1kHz

10kHz 20kHz

Frequency, HzLow Cut Filter Frequency Response

TYPICAL

35 Hz STAGE MONITOR

100 Hz

OFF

 

170 Hz

 

 

 

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 woofer again!

 

(MONO BRIDGE)

 

 

 

 

 

800 WATTS

 

 

 

 

 

4 OHM LOAD MIN.

 

120 VAC 60 Hz

 

 

 

400 WATTS CH

 

 

 

 

2 OHMS LOAD MIN.

 

1500 WATTS

 

 

 

MONO

1 CHANNEL

 

 

 

 

BRIDGE

 

 

 

CH

CH

 

 

 

1

2

INPUT

LOW CUT

CONSTANT DIRECTIVITY

 

 

 

FILTER

HORN EQ/AIR EQ

+

+

 

TYPICAL

 

 

35 Hz

STAGE

4.5k Hz

 

 

 

 

MONITOR

 

 

 

 

 

100 Hz

OFF ON

–

–

 

 

 

 

 

 

BAL/UNBAL

OFF

170 Hz

2k Hz 6k Hz

 

 

 

 

 

AIR EQ

 

 

 

 

 

TYPICAL

 

SPEAKER OUTPUTS

 

THRU

 

 

AMP MODE

STEREO MONO

BRIDGE

TYPICAL

CAUTION

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT

SERIAL NUMBER

MANUFACTURING DATE

 

 

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

 

 

 

 

 

 

 

CHANNEL 2

LIMITER

CONSTANT DIRECTIVITY

LOW CUT

 

INPUT

HORN EQ/AIR EQ

 

FILTER

 

 

 

 

 

 

TYPICAL

 

 

 

 

4.5k Hz

35 Hz

STAGE

 

 

 

 

 

 

 

MONITOR

 

 

OFF ON

OFF ON

 

 

 

100 Hz

 

 

 

 

2k Hz

6k Hz

OFF

170 Hz

 

BAL/UNBAL

 

 

 

AIR EQ

 

 

 

 

TYPICAL

TYPICAL

 

 

 

 

 

 

THRU

14