Mackie Stereo Amplifier M1200 User Manual

TM  
FAST RECOVERY SERIES HIGH CURRENT POWER AMPLIFIERS  
MORE INFORMATION  
FEATURES  
The world is full of amplifiers  
that do one thing – amplify  
audio signals. But at Mackie  
Designs, weve always put  
out the extra effort to provide  
more quality and more  
features than our competitors  
while maintaining a com-  
parable (or lower) price.  
The FR Series™ power  
amplifiers are designed to  
perform reliably under the  
most adverse conditions,  
and weve added a bundle  
of extra features, so you  
dont have to put out the  
extra bucks to buy a bunch  
of add-ons or plug-ins to  
make your sound system  
do what you want it to do.  
Fast Recovery design  
for improved transient  
response and recovery  
from clipping  
Rack-mountable (2U)  
with rear support rails  
for extra support  
Separate left and right  
detented gain controls,  
calibrated in both dB  
and volts  
M•1200/ M•1400  
ARCHITECTS &  
ENGINEERS  
SPECIFICATIONS  
“IN YOUR FACE”  
SOUND REINFORCEMENT  
& RECORDING BROCHURE  
Low-cut filter with  
variable frequency  
control (Off – 170Hz)  
Subsonic stabilization  
eliminates ultra-low-  
frequency noise caused  
by microphone han-  
dling, stage rumble  
Constant directivity horn  
compensation with  
variable high-frequency  
boost control (2kHz to  
6kHz)  
Amp Mode switch for  
Stereo, Mono, or Bridge  
modes  
Balanced XLR and 1/4"  
TRS input jacks  
Balanced XLR thru jacks  
Heavy-duty binding post  
output jacks in parallel  
with:  
M•1200 —  
1/4" TS output jacks  
M•1400 —  
Speakon® output jacks  
6 LED metering includ-  
ing Signal Present and  
Overload  
Separate L/ R Protect  
LEDs indicate the  
following protection  
conditions:  
Meticulous Detail  
Perhaps the most impor-  
tant aspect of the FR Series  
amplifiers is the attention  
to detail in the design of  
the electronic architecture.  
We have incorporated a  
number of unique properties  
including Fast Recovery,  
sustained high-current output  
capability, high voltage and  
current slew rate, and defeat-  
able clipping eliminator, to  
ensure that the output of  
the amplifier is virtually  
distortion-free.  
Limiter to eliminate  
clipping in both channels  
Subwoofer mode switch  
with dual-frequency select  
(63Hz/ 125Hz)  
1) Automatic turn-on  
delay to prevent poten-  
tially damaging thumps  
and pops from reaching  
your speakers  
2) Short-circuit protect  
with separate L/ R  
indicating LEDs  
T-Design Constant  
Gradient Cooling Tunnel  
uses two short tunnels  
instead of one long  
tunnel for improved  
cooling efficiency and  
output device reliability  
3) Thermal protect with  
combined Ch1 and 2 Cold Dual-speed cooling fan  
and Hot indicating LEDs  
Toroidal transformer for  
SCR Crowbar DC offset  
reduced EMI emissions  
protect  
®
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so it doesnt  
degrade the  
audio signal in  
any way.  
T-Design  
Constant  
Gradient  
Cooling  
Tunnel.  
Most amplifi-  
ers have a fan  
in the back that  
blows air (along  
with dust and  
Each channel  
has an inde-  
pendent gain  
control with  
40 detents for  
accurately  
setting and  
matching the  
gain between  
channels. The  
gain controls  
are calibrated  
in dB (from  
off to 30) and  
in volts (with  
indications of  
other contami-  
nants) into the  
inside of the  
amplifier, across  
1V, 2V, and 3V).  
Six discrete  
LEDs are used  
the heatsinks  
as well as all the other inter-  
nal components, and finally  
out through the front.  
These designs are cheap to  
implement, but not very  
efficient.  
Others use a cooling tun-  
nel with the fan at one end.  
The problem with this design  
is that the heat from the  
first transistors warms the  
air so that by the time the  
air reaches the end of the  
tunnel its too hot to provide  
sufficient cooling.  
Our T-Design Constant  
Gradient Cooling Tunnel  
offers a much more efficient  
method of providing cool  
air to all the transistors with-  
out blowing contaminants  
all over its insides. A dual-  
speed fan is located in the  
center of the amplifier, direct-  
ing air from the front of the  
amplifier  
fier operates with one input  
and two identical outputs. It  
accepts an input signal through  
channel 1, and outputs the  
same signal at both channel  
1 and 2 speaker outputs.  
In bridge mode, the ampli-  
fier operates with one input  
and one output. It accepts an  
input signal through channel  
1, and combines the power  
of both output sections into  
a single output, using the  
channel 1 positive and  
to indicate signal level for  
each channel, including a  
signal present LED, indicators  
at –20, –9, –6, and –3dB  
below full power, and an  
overload LED to indicate  
when the output has reached  
the clipping point.  
Outputs.  
The M•1200 and M•1400  
differ in their output con-  
nector configurations. They  
both come with heavy-duty  
5-way binding posts, which  
can accept standard double  
banana plugs, spade lugs, or  
bare wire (Export versions  
will not accept banana plugs  
due to European safety  
requirements). The M•1200  
also has 1/4" TS phone jack  
outputs in parallel with the  
binding posts. The M•1400  
comes with Neutrik brand  
Speakon® connectors in par-  
allel with the binding posts.  
channel 2 positive speaker  
output terminals.  
Clipping eliminator.  
Mackie Designs power  
amplifiers use a method of  
protecting the amplifier and  
the speakers from clipping  
that doesnt affect the low  
impedance capablility of the  
amplifier. A defeatable limiter  
circuit is em-  
ployed that  
reduces the  
input signal  
when the out-  
through a  
large intake  
manifold into  
the cooling  
tunnel. The  
cool air is  
evenly dis-  
tributed  
Stereo, Mono and Bridge  
modes.  
The amplifiers can be oper-  
ated in one of three modes.  
In stereo mode, the amplifier  
operates with two inputs and  
two outputs. It accepts sepa-  
rate channel 1 and 2 input  
signals, and outputs separate  
channel 1 and 2 signals.  
In mono mode, the ampli-  
put of the  
amplifier ap-  
proaches the  
clipping point.  
Cooling tunnel airflow  
The moment the output  
level drops below clipping,  
the limiter turns off and is  
effectively “out-of-circuit,”  
from the middle of the tun-  
nel to each end, where the  
warm air then exits the  
amplifier on either side.  
3
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Block Diagram  
17.25" (43.8cm)  
M1200/1400  
WEIGHT  
36 lbs.  
(16.3 kg)  
M1200/M1400  
DIMENSIONS  
FULL SYMMETRY DUAL DIFFERENTIAL HIGH CURRENT DESIGN  
PROFESSIONAL POWER AMPLIFIER  
CH  
1
CH  
2
CH  
GAIN/dB  
GAIN/dB  
CH  
OL  
–3  
OL  
–3  
3v  
20  
3v  
20  
1
2
INTERNAL STATUS  
ON  
18  
22  
18  
22  
2v  
2v  
16  
14  
24  
26  
28  
–6  
–9  
–6  
–9  
16  
14  
24  
26  
28  
PROTECT  
SHORT  
–20  
–20  
TEMP STATUS  
CH  
OFF  
8
8
30  
1
30  
1v  
1&  
2
v
COLD  
HOT  
SENSITIVITY 1.23v (+4dBu)  
SENSITIVITY 1.23v (+4dBu)  
SIG  
SIG  
POWER  
19.00" (48.3cm)  
Built-in subwoofer crossover.  
The amplifier has a sub-  
woofer mode that allows you  
to turn on the built-in sub-  
woofer crossover. When  
activated, the signals appear-  
ing at the left and right inputs  
are summed, directed to a  
low-pass filter, and routed  
to both output stages. A  
switch selects the cutoff fre-  
quency of the filter at either  
63Hz or 125Hz, and the ampli-  
fier can be set to either mono  
or bridge mode of operation.  
Built-in constant directivity  
horn compensation.  
When a compression driver  
is attached to a constant  
directivity (CD) horn, it requires  
a certain amount of high-  
4
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frequency signals that the  
loudspeaker cannot reproduce.  
Each channel of the FR  
to the speakers.  
Separate left and right  
Short LEDs indicate if there  
Series amplifiers has a con- is a short circuit at the  
tinuously variable low-cut  
filter. Simply dial in the fre-  
quency at which the loud-  
speaker output terminals.  
This lets you know at a glance  
to check the speaker wiring  
speakers drop off (anywhere for shorts (or recalculate the  
from OFF to 170Hz), and  
reap the benefits of saving  
amplifier power with  
cleaner, tighter bass.  
Built-in subsonic stabilizer.  
speaker load impedance)  
right from the get-go, so you  
dont waste precious time  
searching for the problem.  
Combined left and right  
Cold and Hot LEDs indicate  
if the amplifier has overheated.  
Under normal operation,  
the Cold LED remains lit. If  
the Hot LED should light,  
the outputs become muted  
until the amplifier cools to  
a safe operating temperature,  
then normal operation ensues.  
frequency boost to compen-  
sate for the natural roll-off  
inherent in all compression  
drivers. Some speaker manu-  
facturers provide external  
processors with plug-in  
modules for each of the  
various combinations of  
horns and drivers (at an  
additional cost to you!) to  
compensate the CD horns.  
Each channel of an FR  
Series power amplifier has  
its own built-in CD horn  
compensation circuit. All you  
need to do is set the variable-  
frequency horn EQ control on  
the amplifier to the manu-  
facturers recommended mass  
breakpoint frequency (the  
point where the frequency  
response begins to roll off).  
As an added feature, if youre  
not using CD horns, set the  
frequency control fully clock-  
wise to the AIR setting to en-  
joy Mackies exclusive AIR  
EQ, a gentle high-frequency  
boost that brightens and  
lightens the sound.  
Even with the low-cut  
filter set to the OFF position,  
each channel of the FR Series  
amplifiers has a built-in  
subsonic stabilizer (technically  
called infrasonic stabilizer).  
This dampens the very low  
frequencies, which can be  
caused by microphone  
handling or stage rumble.  
These frequencies are below  
the threshold of human  
hearing, and rob the amplifier  
of power and contribute to  
intermodulation distortion.  
The FR Series: The most  
affordable, full-featured  
power amplifiers available.  
As you can see, there is  
every reason the M•1200  
and M•1400 are fast becoming  
the premier affordable choice  
for many sound reinforcement  
and recording applications.  
With their proven durability,  
professional features and  
specs, and certainly not least,  
low cost – the FR Series is  
destined to be a classic.  
There are no other power  
amplifiers in their class with  
all these features at such  
an affordable price.  
Protection circuits.  
Both amplifiers are  
equipped with a number of  
unique and innovative protec-  
tion circuits to ensure the  
safety of your speakers and  
the amplifiers.  
Separate left and right  
Protect LEDs on the front  
panel indicate when a protec-  
tion circuit has been activated.  
For example, when the am-  
plifier is first turned on the  
outputs are muted for three  
seconds, during which time  
the Protect LEDs are lit. This  
allows time for all the equip-  
ment in the system to power  
up and stabilize, and prevents  
potentially damaging thumps  
or pops from propagating  
Low-cut filter.  
And thats why people  
Virtually all loudspeakers  
have a low-frequency cutoff  
point somewhere above  
20Hz. Many low-frequency  
drivers have a 3dB point  
at 35Hz to 40Hz, while many  
stage monitor speakers cut  
off at about 100Hz; theres  
no sense in amplifying low-  
from all professions, with  
all kinds of different applica-  
tions, prefer Mackies FR Series.  
Youll like them because of  
their low price, easy-to-use  
features, and rugged construc-  
tion. Thats got to sound good.  
And, of course, Mackie does.  
5
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Frequency Response:  
20Hz to 40kHz (+0, –1dB)  
10Hz to 70kHz (+0, –3dB)  
Limiter Section:  
Complementary Positive and  
Negative Peak Detecting  
SPECIFICATIONS  
Continuous Average Output  
Power, both channels driven:  
Indicators:  
Six meter LEDs per channel  
SIG (Signal Present),  
–20, –9, –6, –3, OL (Overload)  
CH 1 & 2  
PROTECT LEDs  
SHORT LEDs  
TEMP STATUS  
COLD, HOT LEDs  
Distortion:  
THD, SMPTE IMD, TIM  
M•1200  
225 watts per channel into  
8 ohms from 20Hz to 20kHz, with  
no more than 0.025% THD  
400 watts per channel into  
4 ohms from 20Hz to 20kHz, with  
no more than 0.050% THD  
600 watts per channel into  
2 ohms from 20Hz to 20kHz, with  
no more than 0.095% THD  
< 0.025%@8Ω  
< 0.050%@4Ω  
< 0.150%@2Ω  
Signal to Noise Ratio:  
> 107dB below rated  
power into 4 ohms  
Channel Separation:  
Power Consumption:  
M•1200  
65 watts at idle  
500 watts with musical program  
fully loaded 6.4A 3.2A  
(4per side, or 8bridged)  
850 watts with musical program  
fully loaded  
(2per side, or 4bridged)  
> 80dB@1kHz  
Bridged mono operation:  
120V 240V  
0.9A 0.5A  
Damping Factor:  
800 watts into 8 ohms from 20Hz  
to 20kHz, with no more than  
0.05% THD  
1200 watts into 4 ohms from  
20Hz to 20kHz, with no more  
than 0.095% THD  
Maximum Power at 1% THD (per  
IHF-A-202):  
250 watts per channel into 8Ω  
425 watts per channel into 4Ω  
640 watts per channel into 2Ω  
850 watts into 8bridged  
> 350 from 0 to 400Hz  
Input Impedance:  
20kbalanced bridging  
Input Sensitivity:  
1.23 volts (+4dBu) for rated  
power into 4 ohms  
10.0A 5.0A  
800 watts at full power into 8Ω  
(cont. sine wave)  
9.3A 4.7A  
Gain:  
1400 watts at full power into 4Ω  
30.25dB (32.5V/ V)  
(cont. sine wave) 15.0A 7.5A  
Maximum Input Level:  
2400 watts at full power into 2Ω  
9.75 volts (+22dBu)  
1280 watts into 4bridged  
(cont. sine wave) 24.3A 12.2A  
M•1400  
65 watts at idle  
550 watts with musical program  
fully loaded 6.7A 3.4A  
(4per side, or 8bridged)  
900 watts with musical program  
fully loaded  
(2per side, or 4bridged)  
120V 240V  
0.9A 0.5A  
Rise Time:  
< 4.4µs  
M•1400  
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  
no more than 0.025% THD  
630 watts per channel into  
2 ohms from 20Hz to 20kHz, with  
no more than 0.050% THD  
Slew Rate:  
Voltage Slew Rate  
> 100V/ µs bridged  
Current Slew Rate  
> 32A/ µs at 2Ω  
CMRR: > 40dB, 20Hz to 20kHz  
> 50V/ µs  
10.5A 5.3A  
850 watts at full power into 8Ω  
Transient Recovery:  
< 1µs for 20dB overdrive @ 1kHz  
(cont. sine wave)  
9.6A 4.8A  
1500 watts at full power into 4Ω  
Bridged mono operation:  
High Frequency Overload and  
Latching:  
No latch up at any frequency or  
level  
(cont. sine wave) 15.6A 7.8A  
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  
Maximum Power at 1% THD (per  
IHF-A-202):  
280 watts per channel into 8Ω  
480 watts per channel into 4Ω  
700 watts per channel into 2Ω  
960 watts into 8bridged  
2500 watts at full power into 2Ω  
(cont. sine wave) 24.8A 12.4A  
AC Line Power:  
Variable Low-Cut Filter:  
10Hz (Off) to 170Hz,  
2nd Order Bessel  
US  
120VAC, 60Hz  
240VAC, 50/ 60Hz  
100VAC, 50/ 60Hz  
220VAC, 60Hz  
Europe  
Japan  
Korea  
Subwoofer Low-Pass Filter:  
Switched: 63Hz/ 125Hz,  
3rd Order Bessel  
AC Drop-out Voltage:  
At approximately 50% of rated  
line voltage  
Constant Directivity High  
Frequency Boost:  
2kHz to 6kHz (+3dB points)  
6dB/ octave high-frequency  
shelving filter, (shelving occurs at  
approximately 30kHz)  
Physical:  
1400 watts into 4bridged  
Note: Power ratings are specified  
at 120VAC (U.S. and Canada) and  
240VAC (Export) line voltages.  
Height:  
Width:  
Depth:  
2U = 3.5" (89mm)  
19.0" (483mm)  
15.25" (387mm)  
Handle Depth: 1.25" (32mm)  
Overall Depth: 16.25" (413mm)  
Power Bandwidth:  
20Hz to 70kHz (+0, –3dB)  
Turn On Delay:  
3 seconds  
Weight:  
36 lbs (16.3kg)  
Mackie Designs Inc. is engaged in a continuous  
program of product evaluation and improvement  
and reserves the right to change product  
specifications at any time without notice.  
®
®
The following are trademarks or registered  
trademarks of Mackie Designs Inc.: “Mackie.,  
the Running Man, and FR Series.  
Speakon is a registered trademark of Neutrik.  
Part No. 091-096-00 Rev. B 2/ 98  
MACKIE DESIGNS INC.  
1997-1998 Mackie Designs Inc. All Rights  
©
16220 Wood-Red Rd. NE , Woodinville • WA • 98072 • USA  
Toll-Free 800/ 258-6883 • FAX 425/ 487-4337 •  
For distribution information outside the USA,  
425/ 487-4333 FAX 425/ 485-1152  
Reserved.  
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