CROWN MA 1202

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Macro-Tech 1202 (120 V, 60 Hz models)
The power amplifi er shall be a solid-state twochannel
model employing multi-mode® (AB+B)
grounded bridge™ output circuitry.
The outputs shall be switchable as stereo,
bridged-mono or parallel-mono modes of
operation. The bridged-mono mode shall bridge
the outputs to provide increased output voltage.
The parallel-mono mode shall parallel the
outputs to provide increased output current.
The output impedance of each channel shall be
less than 10 milliohms in series with less than
2 microhenries in stereo mode.
The amplifi er shall contain protection circuitry
which limits the drive level placed on the output
devices before their SOA (Safe Operating Area)
is exceeded. This protection circuitry shall
calculate the instantaneous voltage across and
current through the output devices while factoring
in their simulated junction temperatures to
predict how close they are to their operating
limits. This protection shall be called “ODEP.”
The amplifi er shall contain protection from
shorted, open and mismatched loads, general
overheating, DC, high-frequency overloads, and
internal faults. This protection shall be called
“Quad-Mute.”
The amplifi er shall contain controlled slewrate
voltage circuitry to protect it against radio
frequency interference burnouts. It shall also
be protected from current overload at its output
stage. The slew rate of the amplifi er shall be
greater than 13 volts per microsecond in stereo
mode.
The amplifi er shall temporarily go into a standby
mode if its power transformer becomes
excessively hot and shall automatically resume
normal operation once it has cooled to a safe
operating temperature.
The amplifi er shall be safe when driving any
kind of load, including highly reactive ones.
Front-panel controls shall include an enable
on/off switch and a detented input level control
for each channel.
Rear-mounted controls shall include a ground
lift switch to isolate the signal ground from the
chassis ground and a switch which selects between
stereo, bridged-mono and parallel-mono
modes of operation.
Internal controls shall include an input sensitivity
switch to select between 0.775 V, 1.4 V or a
fi xed voltage gain of 26 dB for full rated output.
The amplifi er shall be fully compatible with and
shall provide appropriate input cables and connectors
for Crown® PIP2™ input modules. An
optional input adapter shall be available so the
amplifi er can also accept standard Crown PIP™
input modules. The amplifi er shall be fully
compatible with Harman Pro System Architect
or the Crown IQ System®.
Front panel indicators shall include an amber
power enable indicator, an amber protection
system indicator for each channel which shall
normally be illuminated to confi rm the availability
of reserve thermodynamic energy and which
shall dim in proportion to limiting when the
power demands of the output stages have been
exceeded, and a green dual-function signal
presence/input-output comparator indicator
for each channel which shall normally fl ash at
moderate intensity to show the presence of an
audio signal and shall fl ash brightly if distortion
of any kind equals or exceeds 0.05%.
The power amplifi er shall meet or exceed the
following performance criteria. Input sensitivity
for rated output: 26 dB voltage gain (unbalanced).
Rated FTC output in stereo mode with
less than 0.1% THD : 425 watts per channel
(20 Hz to 20 kHz) into 4 ohms; 295 watts per
channel (20 Hz to 20 kHz) into 8 ohms. Rated
FTC output in bridged-mono mode with less
than 0.1% THD : 850 watts (20 Hz to 20 kHz)
into 8 ohms; 585 watts (20 Hz to 20 kHz) into
16 ohms. Hum and noise: at least 105 dB (A
weighted) below full rated output power. Phase
response: ±10 degrees from 10 Hz to 20 kHz
at 1 watt. Frequency response: 20 Hz to 20
kHz, ±0.1 dB at 1 watt into 8 ohms per channel
in stereo mode. Damping factor: greater
than 1000 from 10 to 400 Hz into 8 ohms.
Intermodulation distortion (SMPTE): less than
0.05% from 163 milliwatts to rated power into
8 ohms in stereo mode. Harmonic distortion at
rated power into 8 ohms per channel (stereo
mode): less than 0.05% from 20 Hz to 1 kHz
and increasing linearly to less than 0.1% at 20
kHz.
The power requirements shall be 120 VAC at 60
Hz. At idle, the amplifi er shall draw 100 watts
or less.
The amplifi er chassis shall be constructed of
steel with a durable black fi nish and shall be
designed for fl ow-through fan-assisted ventilation
from the front panel to the side panels. The
amplifi er shall have an aluminum front panel
with Lexan overlay and air fi lter media.
The dimensions of the amplifi er shall allow
for 19 inch (48.3 cm) EIA standard (RS-310-
B) rack mounting. The amplifi er shall be 3.5
inches (8.9 cm) tall, 16 inches (40.6 cm) deep
behind the rack-mounting surface, and 2.5
inches (6.4 cm) in front of the rack-mounting
surface.
The amplifi er shall weigh 44 pounds, 1 ounce
(20.0 kg) and shall have a center of gravity
approximately 6 inches (15.2 cm) behind the

front panel.

The amplifi er shall be designated the Crown

Macro-Tech 1202