MACKIE M800 - Manual (Page 4)

4
QUICK START
6. Determine which AMP MODE is best
for your application:
• STEREO mode (separate left and right
inputs, separate left and right outputs) is the
typical setup for amplifying stereo signals.
• MONO mode (sometimes called Dual-
Mono mode — one or two inputs, two
mono outputs) is for sending the same
signal to two different speakers, with
separately-adjustable level controls.
• BRIDGE mode (sometimes called
Bridged-Mono — one or two inputs, one
mono output) uses both sides of the amp to
power one speaker. An M•800 power
amplifier in
BRIDGE mode delivers 800
watts (into 4 ohms).
7. In STEREO mode, connect line-level cables
from your mixer or preamplifier to the
INPUT
jacks, either XLR or TRS:
• The balanced XLR inputs are wired
pin 2 = hot (+)
pin 3 = cold (–)
pin 1 = shield (ground).
• The 1/4" TRS inputs are wired
tip = hot (+)
ring = cold (–)
sleeve = shield (ground)
They can accept either balanced (TRS) or
unbalanced (TS) cables.
• The XLR and TRS inputs for each
channel are internally wired in parallel.
8. In BRIDGE mode, connect an input cable
to CH 1 or CH 2 INPUT or both.
INSTALLATION
You can mount the M•800
amp in any standard rack
system (see page 18), or
place it horizontally on a
floor or table.
Note: 4 ohms is the mini-
mum impedance you
should connect to the am-
plifier in
BRIDGE mode
and 2 ohms is the mini-
mum per side for
STEREO.
If you connect lower impedance speakers, the
amplifier may overheat and shutdown.
DO NOT BLOCK THE VENTILATION PORTS.
The M•800 draws its ventilation air in from the
front and out through the side panels. It needs
plenty of fresh air to stay cool.
CONNECTIONS AND SETTINGS
1. Be sure the POWER switch is off before
making connections.
2. Turn the GAIN controls fully down
(counterclockwise) for now.
3. Set both LOW CUT FILTER controls to
their TYPICAL marks (35Hz).
4. Set both CONSTANT DIRECTIVITY
switches OFF (unless you’re using constant
directivity horns with compression drivers).
5. Turn the LIMITER switch ON to provide
protection against clipping.
ON
OFF
POWER
PROFESSIONAL POWER AMPLIFIER FULL SYMMETRY DUAL DIFFERENTIAL HIGH CURRENT DESIGN
OL
– 3
– 6
– 9
– 20
– 3
– 6
– 9
– 20
OL
CH
1
28
26
24
18 20 16
22 14
12
6
0 0
1.23v (+4dBu) SENSITIVITY
GAIN/dB
1.23v (+4dBu) SENSITIVITY
GAIN/dB CH
2
NORM HOT
SIG
CH STATUS
1&2
3v
2v
1v
28
26
24
18 20 16
22 14
12
6
0 0
3v
2v
1v