The Mackie M•1400/M•1400i is a dual channel, high
output power amplier that incorporates a number of
unique features including FR “Fast Recovery” design,
high continuous-current output, built-in subwoofer
crossovers, and a T-Design constant-gradient cooling
tunnel for improved cooling efciency and output device
reliability.
The M•1400/M•1400i is rated at a continuous out-
put of 250 watts per channel into 8Ω, 425 watts per
channel into 4Ω and 630 watts into 2Ω. In bridge mode
the M•1400/M•1400i is rated at 850 watts into 8Ω
and 1260 watts into 4Ω. Variable low-cut lters on
each channel, with a range from off to 170Hz, enable
tighter bass response and a Constant Directivity Horn
EQ improves high-frequency reproduction. The CD Horn
EQ is 6 dB/octave and its “knee” position is sweepable
from 2kHz to 6kHz. The built-in limiter is channel
independent and helps eliminate clipping. Inputs are
balanced/unbalanced 1/4" and XLR, and XLR thru connectors allow the full-range signal to be routed to another
M•1400/M•1400i. Speaker connections on the M•1400
are Speakon® and binding posts, while speaker connections on the M•1400i are 1/4" and binding posts.
To effectively deal with clipping, an amplier must
be able to recover almost instantaneously. That is the
denition of “Fast Recovery”. Rather than using negative feedback to help control clipping distortion, the
M•1400/M•1400i employs a very sparse amount of
negative feedback. The use of Baker Clamp circuits on
the positive and negative voltage amp stages prevents
saturation (and latching) during periods of overdrive. In
addition, a transistor senses when the Baker Clamp is
active and activates the internal limiting circuits. This
results in no latching, instant recovery from overdriving
the amp, and a superior sound.
(continued on page 8)
High-Current Power Amplier
Features
1400 watts max, 1260 watts continuous @ 4 ohms
bridged
Ultra-low-noise/low-distortion design
Fast Recovery circuitry reduces distortion at clipping
Two 2nd order, 12 dB/octave, Bessel low-cut lters with
variable frequency from Off to 170Hz
Constant directivity horn EQ/Air EQ with variable
frequency from 2kHz to 6kHz and on/off switch
Limiter with on/off switch
Balanced/unbalanced 1/4" and XLR inputs
XLR thru outputs
1/4" jacks (M•1400i) or Speakon® (M•1400)
and 5-way binding post outputs (both models)
Detented gain controls calibrated in dB and volts
Signal present and OL LEDs
Channel Status LEDs
Superior T-Design cooling
Five-year, limited warranty (U.S. only)
connectors
AMPLIFIER
M•1400/M•1400i
R E L A T E D P R O D U C T S
M•800 Power Amplier, 1202-VLZ PRO 12-Channel
Mic/Line Mixer, 1402-VLZ PRO 14-Channel Mic/Line
Mixer, 1604 VLZ PRO 16-Channel Mic/Line Mixer,
1642-VLZ PRO 16-Channel Mic/Line Mixer, SR24•4-
VLZ PRO 24 Channel Mic/Line Mixer, SR32•4-VLZ PRO
32 Channel Mic/Line Mixer, CFX Series 12, 16, and 20
Channel Mic/Line Mixer w/Digital Effects, C300z 2-Way
Loudspeaker, C200 2-Way Loudspeaker, SWA1501 and
SWA1801 Active Subwoofers.
Applications
Live sound/music reinforcement for churches,
clubs, schools, conference centers, hotels
High level A/V playback
Large speech systems
O F 8 P A G E S
1
Page 2
M•1400/M•1400i
M•1400/1400i Specications
AMPLIFIER
Maximum Power at 1% THD:
300 watts per channel into 8 ohms
500 watts per channel into 4 ohms
700 watts per channel into 2 ohms
1000 watts into 8 ohms bridged
1400 watts into 4 ohms bridged
Continuous Sine Wave Average Output Power, both
channels driven:
250 watts per channel into 8 ohms from 20Hz to 20kHz, with
no more than 0.012% THD
425 watts per channel into 4 ohms from 20Hz to 20kHz, with
M•1400/M•1400i
no more than 0.025% THD
630 watts per channel into 2 ohms from 20Hz to 20kHz, with
no more than 0.050% THD
Bridged Mono Operation:
850 watts into 8 ohms from 20Hz to 20kHz, with no more than
0.025% THD
1260 watts into 4 ohms from 20Hz to 20kHz, with no more
than 0.050% THD
Power Bandwidth:
20Hz to 70kHz (+0, –3 dB)
Frequency Response:
20Hz to 40kHz (+0, –1 dB)
10Hz to 70kHz (+0, –3 dB)
Distortion:
THD, SMPTE IMD, TIM
<0.025% @ 8Ω
<0.050% @ 4Ω<0.150% @ 2Ω
Signal to Noise Ratio
>107 dB below rated power into 4 ohms
Channel Separation:
>80 dB @ 1kHz
Damping Factor:
>350 from 0 to 400Hz
Input Impedance:
20kΩ balanced bridging
Input Sensitivity:
1.23 (+4 dBu) for rated power into 4 ohms
Voltage Gain:
30.25 dB (32.5V/V)
High-Current Power Amplier
Maximum Input Level:
9.75 volts (+22 dBu)
Rise Time:
<4.4µs
Slew Rate:
Voltage Slew Rate >50V/µs
>100V/µs bridged
Current Slew Rate >32A/µs at 2Ω
CMRR:
>40 dB, 20Hz to 20kHz
Transient Recovery:
1µs for 20 dB overdrive at 1kHz
High Frequency Overload and Latching:
No latch up to any frequency or level
Variable Low-Cut Filter:
10Hz (Off) to 170Hz, 2nd Order Bessel
Subwoofer Low-Pass Filter:
Switched: 63Hz/125Hz, 3rd Order Bessel
Constant Directivity High-Frequency Boost:
2kHz to 6kHz (+3 dB points)
6 dB/octave high-frequency shelving lter, (shelving occurs at
approximately 30kHz)
Limiter Section:
Complementary Positive and Negative Peak Detecting
Indicators:
6 meter LEDs per channel
SIG (Signal Present), –20, –9, –6, –3, OL (Overload)
PROTECT LEDs, CH1 & 2
SHORT LEDs, CH1 & 2
TEMP STATUS
COLD/HOT LEDs
Power Consumption:
65 watts (0.9A) at idle
550 watts (6.7A) with musical program fully loaded
(4 ohms per side, or 8 ohms bridged)
900 watts (10.5A) with musical program fully loaded
(2 ohms per side, or 4 ohms bridged)
850 watts (9.6A) at full power into 8 ohms
(continuous sine wave)
1500 watts (15.6A) at full power into 4 ohms
(continuous sine wave)
2500 watts (24.8A) at full power into 2 ohms
(continuous sine wave)
(continued on page 3)
O F 8 P A G E S
2
Page 3
M•1400/M•1400i
OL
–3
–6
–9
–2
0
–3
–6
–9
–2
0
SIGOLSIG
CH
1
30
28
26
20
22
18
2416
14
8
0
0
1.23v (+4dBu)
SENSITIVITY
GAIN/dB
CH
2
PROTECT
COLD HOT
SHORT
TEMP STATUS
INTERNAL STATUS
CH
1
CH
2
CH
1&
2
ON
OFF
POWER
3v
2v
1v
30
28
26
20
22
18
2416
14
8
0
0
1.23v (+4dBu)
SENSITIVITY
GAIN/dB
3v
2v
1v
PROFES SIONAL POWER AMPLIF IER
FULL SYMMETRY DUAL DIFFERENTIAL HIGH CURRENT DESIGN
19.00" (48.3cm)
17.25" (43.8cm)
15.25" (38.7cm)
3.50"
(8.9cm)
2U
16.38" (41.6cm)
High-Current Power Amplier
AC Line Power:
US (M•1400 and M•1400i) 120 VAC, 60Hz
Europe (M•1400 only) 240 VAC, 50/60Hz
Japan (M•1400 only) 100 VAC, 50/60Hz
Korea (M•1400 only) 220 VAC, 60Hz
THE FOLLOWING ARE TRADEMARKS AND REGISTERED TRADEMARKS OF MACKIE DESIGN INC.: "MACKIE", "FR SERIES", AND THE "RUNNING MAN" FIGURE
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.
AVIS:
RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
CA UTI ON
SERIAL NUMBER
TYPICAL
35 Hz
CHANNEL
2
1
CHANNEL
CH
1
CH
2
SPEAKER OUTPUTS
+
––
+
63Hz
125Hz
CONSTANT DIRECTIVIT
Y
HORN EQ/AIR EQ
CONSTANT DIRECTIVITY
HORN EQ/AIR EQ
INPUT
THRUTHRU
INPUT
AMP MODE
FREQUENCY
4.5 k Hz
ON
6k Hz
2k Hz
MONO
BRIDGE
LIMITER
(CH1 & CH2)
OFF
FULL
RANGE
SUB
WOOFER
LOW CUT
FILTER
LOW CUT
FILTER
OUTPUT APPLICATION
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.
CA UTI ON
AVIS:
RISCQUE DE CHOC ÉLECTRIQUE — NE PAS OUVRIR
BALANCED
OR
UNBALANCED
BALANCED
OR
UNBALANCED
AIR EQ
MONO
BRIDGE
ON
/ BRIDGE/ MONO
170 Hz
OFF
4.5k Hz
6k Hz
2k Hz
AIR EQ
120 VAC 50/60 Hz
1500 WATTS
+
–
170 Hz
100 Hz
OFF
STAGE
MONITOR
100 Hz
STAGE
MONITOR
OFF
TYPICAL
ON
OFF
TYPICAL
TYPICAL
35 Hz
TYPICAL
35 Hz
STEREO
TYPICAL
STEREO
TYPICAL
AIR EQ
AIR EQ
CONCEIVED, DESIGNED, AND MANUFACTURED BY MACKIE DESIGNS INC • WOODINVILLE • WA
THE FOLLOWING ARE TRADEMARKS AND REGISTERED TRADEMARKS OF MACKIE DESIGN INC.: "MACKIE", "FR SERIES", AND THE "RUNNING MAN" FIGURE
(MONO BRIDGE)
1000 WATT
S
8 OHM LOAD
(STEREO)
500 W / 500
W
4 OHM LOAD
OUTPUTS
SUITABLE
FOR CLASS
2 WIRING
OUTPUTS
SUITABLE
FOR CLASS
2 WIRING
M•1400/M•1400i Front Panel
M•1400i Rear Panel
High-Current Power Amplier
M•1400 Rear Panel
O F 8 P A G E S
5
Page 6
M•1400/M•1400i
Architects’ and Engineers’ Specications
1. GENERAL. The amplier shall have a free-standing
frame with front and rear brackets for rack-mounting,
and supplied with four resilient feet suitable for tabletop placement. The amplier shall be capable of twochannel operation, with a switch to place the amplier
into single-channel operation by bridging the outputs of
the two channels.
2. POWER OUTPUT. The two-channel power ampli-
er shall deliver a rated continuous average sine wave
power output over a 20Hz to 20kHz bandwidth of 250
watts RMS into 8 ohms per channel, 425 watts into 4
ohms, and 630 watts into 2 ohms with both channels
operating, with no more than 0.05% total harmonic distortion. In single-channel operation it shall deliver 850
watts RMS into 8 ohms and 1260 watts into 4 ohms, with
no more than 0.05% total harmonic distortion.
The power amplier shall deliver a maximum continuous average sine wave power output at mid-band of 300
watts RMS into 8 ohms per channel, 500 watts into 4
ohms, and 700 watts into 2 ohms with both channels
operating, with no more than 1% total harmonic distortion. In single-channel operation it shall deliver 1000
watts RMS into 8 ohms and 1400 watts into 4 ohms, with
no more than 1% total harmonic distortion.
3. POWER SUPPLIES.
ages for the amplier shall be provided by an internal
power supply. A master power switch shall be located on
the front panel along with a green power-indicating light.
4. INPUT CHANNEL CONNECTIONS. Each monaural
input channel shall have an electronically balanced linelevel input, presenting no less than a 20k ohm impedance to the source. Each input shall have an input sensitivity of +4 dBu, requiring no more than 1.23V RMS to
be driven to rated output into a 4 ohm load. The input
connector shall appear on the rear panel as a female
XLR-3 type connector. In addition, each monaural input
channel shall have a parallel 1/4" TRS phone jack and a
male XLR-3 type connector, which can be used as inputs
or “thru” jacks for daisy-chaining the input signal to
another amplier. Pin 2 of the XLR connectors, and the
tip of the 1/4" TRS phone jack, shall be non-inverting.
5. INPUT CHANNEL LEVEL CONTROLS. Each mon-
aural input channel shall be equipped with a gain control
appearing on the front panel, each having 20detent
positions, and calibrated in dB and volts.
6. FRONT PANEL INDICATORS. Each channel shall
have an associated six-segment LED meter appearing on
the front panel, capable of displaying signal present,
–20 dB, –9 dB, –6 dB, –3 dB, and overload. Each channel shall have internal status LEDs appearing on the front
All necessary operating volt-
High-Current Power Amplifer
panel to indicate activation of protect mode and short-circuit protection. Two temperature status LEDs shall appear
on the front panel, one to indicate normal operation
(COLD) and one to indicate thermal protection (HOT).
7. PROTECTION FEATURES. The amplier shall pro-
vide delayed activation of the outputs at turn-on. Each
channel shall have a short-circuit protection circuit for
detecting excessive current ow at the output that, when
activated, mutes the output for four seconds. The shortcircuit protection shall continuously cycle on and off until
the shorted condition is remedied. The amplier shall
have a thermal protection circuit to protect the power
devices from over-temperature operation. The circuit shall
activate when the internal temperature crosses the safeoperating threshold and, when activated, mute the outputs until the internal temperature cools to a safe-operating temperature, at which time amplier shall resume
normal operation. The amplier shall have a fan to cool
the heat-producing internal components, drawing cool air
in from the front, and exhausting warm air out through
both sides. The fan shall operate at two speeds, the
speed being determined by the internal temperature and
the signal level present at the output. The amplier shall
have an SCR crowbar circuit to protect the speakers
against a catastrophic amplier failure. The circuit shall
activate in the presence of continuous DC at the speaker
outputs, and shall shut the amplier down by turning off
the high-voltage rails.
8. OUTPUT CONNECTIONS. M•1400i: Each channel
shall have a heavy-duty 5-way binding post speaker output connector appearing on the rear panel, with 3/4"
spacing for accommodating standard double banana
plugs as well as spade lugs or bare wires. Each channel
shall have a 1/4" TS phone speaker output jack appearing
on the rear panel in parallel with the binding post.
M•1400: Each channel shall have a heavy-duty 5-way
binding post speaker output connector appearing on the
rear panel, with 3/4" spacing for accommodating standard double banana plugs (120V versions only) as well
as spade lugs or bare wires. Each channel shall have a
Neutrik brand Speakon® speaker output jack appearing
on the rear panel in parallel with the binding post output.
9. AMP MODES. The amplier shall have a three-way
switch appearing on the rear panel for selecting the mode
of operation, which shall include stereo (two channels
in, two channels out), mono (one channel in, two channels out), and bridge (one channel in, one channel out,
bridged between both speaker outputs).
10. OUTPUT APPLICATIONS. The amplier shall
have a three-way switch appearing on the rear panel for
(continued on page 7)
O F 8 P A G E S
6
Page 7
M•1400/M•1400i
High-Current Power Amplier
(continued from page 6)
selecting limiter on, limiter off, and subwoofer mode. The
defeatable electronic limiter circuit shall sense the onset
of clipping and shall limit the input signal and thereby
prevent the output from clipping. The amplier shall have
a two-way switch appearing on the rear panel for selecting between a 63Hz and 125Hz low-pass cutoff frequency
when subwoofer mode is selected.
11. LOW-CUT FILTER. Each channel shall have a low-
cut lter with a variable frequency control appearing on
the rear panel covering a range of 10Hz (OFF) to 170Hz.
12. CONSTANT DIRECTIVITY HORN EQ. Each chan-
nel shall have a two-way switch appearing on the rear
panel for selecting a constant directivity horn equalization circuit. When selected, this circuit shall provide a
6 dB per octave high-frequency boost. The EQ shall
have a variable frequency control appearing on the
rear panel covering a range of 2kHz to 6kHz. The
6kHz position shall be called AIR.
13. PHYSICAL CONFIGURATION. The amplier
shall be rack-mountable with rear support rails for
extra support, and shall have a steel chassis frame
painted gray-black. The amplier shall be 19" wide
(483mm), 3.5" (2U) tall (89mm), and 15.25" deep
(387mm), and shall weigh 36 pounds (16.3 kg).
14. DESIGNATION. The power ampliers shall be
a Mackie M•1400 and M1400i.
AMPLIFIER
M•1400/M•1400i
O F 8 P A G E S
7
Page 8
M•1400/M•1400i
High-Current Power Amplier
AMPLIFIER
(continued from page 1)
The M•1400/1400i uses a unique T-Design
constant-gradient cooling tunnel that draws air in
through the front of the amplier and forces it out
through the amplier’s sides. The T-Tunnel design
provides a shorter, more direct path for cool air. This
allows for reduced heat build up and cooler transistor operation.
The amplier has a subwoofer mode that allows
you to turn on the built-in subwoofer crossover.
When activated, the signals appearing at the left
M•1400/M•1400i
and right inputs are summed, directed to a low-pass
lter, and routed to both output stages. The inputs
are summed regardless of stereo, mono, or bridge
amp mode selection. A switch selects the cutoff frequency of the lter at either 63Hz or 125Hz.
www.mackie.com
16220 Wood-Red Road NE, Woodinville, WA 98072 USA
800.898.3211, fax 425.487.4337, sales@mackie.com
UK +44.1268.570.808, fax +44.1268.570.809, uk@mackie.com
Electronic les for this product available at:
www.mackie.com
This Specication Sheet M1400_SS.PDF
Owner/Operator’s Manual M1400_OM.PDF