Crown Micro-Tech MT-1200 User manual

MICRO-TECH SERIES
The Crown®Micro-Tech®600, 1200 and
2400 are the original industry standards
for touring amplifiers. Micro-Tech am-
plifiers are known around the world as the
benchmark for high-density, ultra-pure power
in a compact package. In addition, each model
gives you Crown’s legendary ODEP®protection
to keep the show going long after other ampli-
fiers would fail.
Micro-Tech amplifiers use proven technol-
ogy and a miniaturized design to deliver
terrific value for their size, weight and price.
Crown’s patented ODEP protection circuitry
and Grounded Bridge™output stages combine
to provide performance and reliability that
surpass traditional designs. Micro-Tech ampli-
fiers also have an independent high-voltage
power supply for each channel. This approach
results in extremely low crosstalk and makes
it possible to use each channel as a separate
amplifier.
Plus, your investment in a Micro-Tech ampli-
fier is backed by Crown’s unequaled Three-
Year, No-Fault, Fully Transferable Warranty that
covers everything.
For more details about the Crown Micro-Tech
Series, contact the Crown Technical Support
Group at 800-342-6939 or 574-294-8200.
Also, visit the Crown Audio website at www.
crownaudio.com.
Specifications
The following applies to 120 VAC, 60 Hz units in Stereo mode
with both channels driven into 8 ohm loads and an input
sensitivity of 26 dB unless otherwise specified. Specifications
for units supplied outside the USA may vary slightly at differ-
ent AC voltages and frequencies.
Power
Output Power: See power charts below.
Load Impedance: Safe with all types of loads.
Rated for 2 to 16 ohms in Stereo mode, 4 to
16 ohms in Bridge-Mono mode, and 1 to 4
ohms in Parallel-Mono mode.
Voltage Gain (at maximum level setting):
MT-600: 20:1 ±6% or 26 dB ±0.5 dB at 26
dB gain setting. 55:1 ±6% or 35 dB ±0.5 dB
at 0.775 volt sensitivity; 31:1 ±6% or 30 dB
±0.5 dB at 1.4 volt sensitivity.
MT-1200: 20:1 ±6% or 26 dB ±0.5 dB at 26
dB gain setting. 64:1 ±6% or 36 dB ±0.5 dB
at 0.775 volt sensitivity; 34:1 ±6% or 31 dB
±0.5 dB at 1.4 volt sensitivity.
MT-2400: 20:1 ±6% or 26 dB ±0.5 dB at 26
dB gain setting. 83:1 ±6% or 38 dB ±0.5 dB
at 0.775 volt sensitivity; 46:1 ±6% or 33 dB
±0.5 dB at 1.4 volt sensitivity.
Required AC Mains: 100, 120, 220 and
240VAC (±10%), 50 and 60 Hz units are avail-
able.
AC Line Current:
AC mains current, frequency and voltage
requirements are provided on the unit’s back
panel.
At Idle: All amps draw no more than
90 watts.
AC Line Connector: All units are shipped with
an appropriate plug and cord for the required
AC voltage.
Performance
Frequency Response: ±0.1 dB from 20 Hz to
20 kHz at 1 watt.
Phase Response: ±10 degrees from 20 Hz to
20 kHz at 1 watt.
Signal to Noise Ratio:
A-Weighted:
Better than 105 dB below full bandwidth
power.
20 Hz to 20 kHz:
Better than 100 dB below full bandwidth
power.
Total Harmonic Distortion (THD): Less than
0.5% at full bandwidth power from 20 Hz to 1
kHz increasing linearly to 0.1% at 20 kHz.
Intermodulation Distortion (IMD): (60 Hz and
7 kHz at 4:1) Less than 0.05% from 163 mil-
liwatts to full bandwidth power.
Damping Factor: Better than 1,000 from 10 Hz
to 400 Hz.
Common Mode Rejection (CMR): At rated full
bandwidth power, better than 70 dB from 20
Hz to 1 kHz falling linearly to better than 50 dB
at 20 kHz.
DC Output Offset (shorted input): <±10 mV.
Features
• Crown’s Grounded Bridge™ design delivers
large voltage swings without using easily
stressed output-transistor configurations
like conventional amplifiers; the results are
lower distortion and superior reliability
• Patented ODEP®(Output Device Emulation
Protection) circuitry compensates for over-
heating and overload to keep the amplifier
working when others would fail
• High damping factor provides superior
motion control over low-frequency drivers
for clean, accurate low end
• Full protection against shorted outputs,
open circuits, DC, mismatched loads, gen-
eral overheating, high-frequency overloads
and internal faults
• 1/4-inch and balanced XLR input connec-
tors
• Ground lift switch to isolate chassis and
phone jack audio grounds
• Internal three-position input sensitivity
switch provides settings of 0.775 and 1.4
volts for standard 1 kHz power, and 26 dB
voltage gain
• Three-Year, No-Fault, Fully Transferable
Warranty completely protects your invest-
ment and guarantees its specifications
MT-600
MT-1200
MT-2400
8 ohm Stereo (per channel)
1 kHz
Power
225W
325W
400W
655W
750W
4 ohm Bridge-Mono
8 ohm Bridge-Mono
2 ohm Stereo (per channel)
4 ohm Stereo (per channel)
MT 600
*1 kHz Power: refers to maximum average power in watts
at 1 kHz with 0.1% THD.
*
8 ohm Stereo (per channel)
1 kHz
Power
520W
800W
1,050W
1,585W
2,070W
4 ohm Bridge-Mono
8 ohm Bridge-Mono
2 ohm Stereo (per channel)
4 ohm Stereo (per channel)
MT 2400
*1 kHz Power: refers to maximum average power in watts
at 1 kHz with 0.1% THD.
*
8-ohm Stereo (per channel)
1 kHz
Power
310W
480W
675W
970W
1,300W
4-ohm Bridge-Mono
8-ohm Bridge-Mono
2-ohm Stereo (per channel)
4-ohm Stereo (per channel)
MT 1200
*1 kHz Power: refers to maximum average power in watts
at 1 kHz with 0.1% THD.
*

Crown International
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
TEL: [phone]
FAX: [phone]FAX
www.crownaudio.com
Specifications subject to change without prior notice. Latest
information available at www.crownaudio.com.
Grounded Bridge is a trademark and Crown, Crown Audio,
ODEP and Micro-Tech are registered trademarks of Crown
International. Other trademarks are the property of their
respective owners. Printed in U.S.A.
© 2005 Crown Audio®, Inc.
7/05 136733-1B
Crown’s Three-Year, No-Fault, Fully Transferable Warranty
Crown offers a Three-Year, No-Fault, Fully Transferable Warranty for every new Crown ampli-
fier—an unsurpassed industry standard. With this unprecedented No-Fault protection, your new
Crown amplifier is warranted to meet or exceed original specifications for the first three years of
ownership. During this time, if your amplifier fails, or does not perform to original specifications,
it will be repaired or replaced at our expense. About the only things not covered by this warranty
are those losses normally covered by insurance and those caused by intentional abuse. And the
coverage is transferable, should you sell your amplifier.
See your authorized Crown dealer for full warranty disclosure and details. For customers outside
of the USA, please contact your authorized Crown distributor for warranty information or call
574-294-8200.
Controls and Connectors
Level: A back panel rotary potentiometer for
each channel used to control the output level.
Power: A front panel rocker switch used to turn
the amplifier on and off.
Stereo/Mono: A three-position back panel
switch used to select Stereo, Bridge-Mono or
Parallel-Mono mode.
Sensitivity: A three-position switch inside the
back cover plate used to select the input sensi-
tivity for both channels: 0.775 volt or 1.4 volts
for standard 1 kHz power into 8 ohms, or 26
dB gain.
Ground Lift: A two-position back-panel switch
used to isolate the phone jack input grounds
from the AC ground.
Reset: A back-panel pushbutton switch (one
per channel) that resets the circuit breaker.
Indicators
(all located on front panel)
Enable: This amber indicator shows the on/off
status of the low-voltage power supply and
cooling fan.
ODEP: Each channel has an amber front panel
indicator that shows thermal-dynamic energy
reserve. Normally, each ODEP indicator is lit to
show available reserve energy. The indicator
will dim proportionally as the energy reserve
for its channel decreases. In the rare event
that a channel has no reserve, its indicator
will turn off and the ODEP circuitry will limit
the channel’s output drive. They remain off
if the power is turned off, disconnected, or if
the low-voltage power supply fuse blows. A
channel’s ODEP indicator will also remain off if
its high-voltage supply fuse blows (or breaker
opens) or if transformer thermal protection is
activated.
Input/Output
Input Connector: Two balanced 1/4-inch (6.35-
mm) phone jacks in parallel with two XLR
connectors.
Input Impedance: Nominally 20 k ohms, bal-
anced. Nominally 10 k ohms, unbalanced.
Input Sensitivity: Settings include 0.775 volt
and 1.4 volts for standard 1 kHz power, or
26 dB gain.
Output Connectors: Two sets of color-coded
binding posts for banana plugs, spade lugs
or bare wire (European models do not accept
banana plugs).
Output Impedance: Less than 10 milliohms in
series with less than 2 microhenries.
DC Output Offset: (Shorted input) ±10 mil-
livolts.
Output Signal:
Stereo: Unbalanced, two-channel.
Bridge-Mono: Balanced, single-channel.
Channel 1 controls are active; Channel 2
should be turned down.
Parallel-Mono: Unbalanced, single-channel.
Channel 1 controls are active; Channel 2 is
bypassed.
Protection
The Micro-Tech Series amplifier is protected
against shorted, open or mismatched loads;
overloaded power supplies; excessive tem-
perature, chain destruction phenomena, input
overload damage and high-frequency blowups.
It also protects loudspeakers from input/output
DC and turn-on/turn-off transients.
If unreasonable operating conditions occur,
the patented ODEP circuitry will proportionally
limit the drive level to protect the output stages,
particularly in the case of elevated temperature.
Transformer overheating will result in a tempo-
rary shutdown of the affected channel; when
it has cooled to a safe temperature, the trans-
former will automatically reset itself. Controlled
slew rate voltage amplifiers prevent RF burn-
outs, and input overload protection is provided
by the input current limit.
Turn On: The four-second turn-on delay pre-
vents dangerous turn-on transients. Turn-on
occurs at zero crossing of the AC waveform, so
power sequencers are rarely needed with mul-
tiple units. Note: To change the turn-on delay
time, contact Crown’s Technical Support Group.
Construction
Steel chassis with durable black finish, front
panel Lexan overlay and specially designed
“flow-through” ventilation from front to side
panels.
Cooling: Internal heat sinks with forced-air
cooling for rapid, uniform heat dissipation.
Dimensions: EIA Standard 19-inch
(48.3-cm) rack mount width (EIA RS-310-B),
3.5 inches (8.9-cm) high and 16 inches (40.6-
cm) deep behind front mounting surface.
Weight:
Micro-Tech 600: 36 lb, 4 oz (16.5 kg) net.
41, lb 2 oz (18.7 kg) shipping.
Micro-Tech 1200: 41 lb, 1 oz (18.6 kg) net.
45, lb 3 oz (20.5 kg) shipping.
Micro-Tech 2400: 46 lb, 14 oz (21.3 kg) net.
55lb, 12 oz (25.3 kg) shipping.
MT-600
MT-1200
MT-2400
The MT-600 is shown. The MT-2400 is the same but has two reset switches near the power cord.