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CONGRATULATIONS...
on your purchase of a new MTX Audio
Thunder Amplifier! MTX has long been
the industry leader in mobile enclosures
and speakers, and we have reached
new heights with the development of the
new MTX Thunder amplifiers. You
couldn’t have chosen a more reliable,
powerful, or better performing amplifier.
In fact, we back up every Thunder
amplifier with a three-year warranty if
installed by an authorized MTX Audio
retailer (see the warranty statement).
Your new MTX Thunder amplifier was
designed, built and thoroughly tested at our
state-of-the-art electronics manufacturing
facility in Phoenix, Arizona. We manufacture
every amplifier using the latest Intelligent
Surface Mount Technology. Some of the
advantages of the new design are its signifi-
cant improvements to the amplifier’s electrical
and mechanical properties. ISMT devices
feature substantially shorter internal and
external lead lengths. This reduces stray
capacitance and inductance, which results in
cleaner and more accurate musical reproduc-
tion with significantly less noise interference.
The ISMT mounter produces amplifier boards
with smaller and lighter components, which
are more resistant to vibrations inherent in the
automotive environment.
A word about power ratings. It is important for you
to know how they stack up. MTX has chosen the
most honest, most conservative way to rate our
amps. We show you the RMS power, at 12.5 volts,
and dynamic power at 14.4 volts. However, we go
above and beyond the call of duty. We test each
amplifier. The technician records the “actual”
power output, and records this number on your
Certified Performance Certificate. The amplifier
must meet or exceed the rated specification
before we’ll ship it. No questions. No exceptions.
We want to ensure you get continuous high
performance from your MTX Thunder
amplifier, so we recommend that you have it
professionally installed by your authorized
MTX dealer.
HOW TO USE THIS MANUAL
If you are installing this amplifier yourself, we
recommend that you read the manual cover-
to-cover before you install it. Familiarize
yourself with the features and details on the
input and output panels. Make sure you have
all the equipment you need. Then follow the
step-by-step installation instructions included.
Sample installation diagrams may be found
on our website:
mtx.com
If you have any questions, write or call us:
MTX Audio
4545 E. Baseline Rd. Phoenix, AZ 85042
602-438-4545 • 800-CALL MTX
technical@mtx.com
mtx.com
Please take a moment to register your
purchase on line at mtx.com.
Please also record the serial number of
your amplifier in the space provided below
and keep this manual for future reference,
as well as your sales receipt as proof of
ownership. (The serial number of your
amplifier is marked on the bottom of its
metal chassis.)
Serial Number:
Date of Purchase:
Introduction
ENGLISH
• Unique rubber Insulated Iso-Feet™ (Patent# 5,521,792)
• Nickel-plated, heavy duty terminal block type connectors
• Speaker and low level inputs
• Input select 2CH / 4CH switch on Thunder4244 functions as a built-in Y connector
• Color-coded wire harness for speaker-level input installation
• Smart-Engage™ auto-turn on for easy integration with factory head units
• Built-in, defeatable18dB/octave HP/LP crossover at 85 Hz
• Thunder4244 Front channel crossover is a defeatable18dB/octave, high pass, at 85Hz
• Adjustable input sensitivity
• Bridgeable, multi-channel circuit design
• Regulated PWM Mosfet Switching Power Supply
• New, more reliable high powered transformers
• Buffered, isolated output for daisy chaining multiple amplifiers
• Pure N-Channel Design
• Intelligent Surface Mount Technology
• Class A 100% discrete driver circuit topology
• Real Time Computerized Protection Circuit
• Anti-Shock PCB mounting design
• Acoustically Seamless Turn-on/Turn-off
Features
Specifications
Thunder4122
RMS Power measured at 12.5 Volts DC:
30 Watts x 2 into a 4 Ohm load with less than 1% THD
60 Watts x 2 into a 2 Ohm load with less than 1% THD
120 Watts bridged into a 4 Ohm load with less than 1% THD
Dynamic Power measured at 14.4 Volts DC:
50 Watts x 2 into a 4 Ohm load
80 Watts x 2 into a 2 Ohm load
200 Watts bridged into a 4 Ohm load
Signal to Noise Ratio: 100dB A-Weighted (Referenced to Rated
PWR at 1VRMS Input Sensitivity)
Damping Factor: >200
Frequency Response: 20-20,000 Hz ±.25dB
Defeatable 18dB/octave crossover at 85 Hz, selectable for high pass,
low pass.
Dimensions: 5.63" x 9.75" x 2" (14.3cm x 24.8cm x 5.1cm)
7.98" x 9.75" x 2.1" (20.3cm x 24.8cm x 5.3cm) Including IsoFeet™
Thunder4202
RMS Power measured at 12.5 Volts DC:
50 Watts x 2 into a 4 Ohm load with less than 1% THD
100 Watts x 2 into a 2 Ohm load with less than 1% THD
200 Watts bridged into a 4 Ohm load with less than 1% THD
Dynamic Power measured at 14.4 Volts DC:
85 Watts x 2 into a 4 Ohm load
140 Watts x 2 into a 2 Ohm load
280 Watts bridged into a 4 Ohm load
Signal to Noise Ratio: 100dB A-Weighted
(Referenced to Rated PWR at 1VRMS Input Sensitivity)
Damping Factor: >200
Frequency Response: 20-20,000 Hz ±.25dB
Defeatable18 dB/octave crossover at 85 Hz, selectable for high pass,
low pass.
Dimensions: 7" x 9.75" x 2" (17.8cm x 24.8cm x 5.1cm)
9.3" x 9.75" x 2.1" (23.6cm x 24.8cm x 5.3cm) Including IsoFeet™
Thunder4244
RMS Power measured at 12.5 Volts DC:
45 Watts x 4 into a 4 Ohm load with less than 1% THD
60 Watts x 4 into a 2 Ohm load with less than 1% THD
120 Watts x 2 bridged into a 4 Ohm load with less than 1% THD
Dynamic Power measured at 14.4 Volts DC:
55 Watts x 4 into a 4 Ohm load
100 Watts x 4 into a 2 Ohm load
200 Watts x 2 bridged into a 4 Ohm load
Signal to Noise Ratio: 100dB A-Weighted (Referenced to Rated
PWR at 1VRMS Input Sensitivity)
Damping Factor: >200
Frequency Response: 20-20,000 Hz ±.25dB
Defeatable 18dB/octave crossover at 85 Hz, selectable for high pass, low
pass, or full range on rear channels and high pass or full range for front
channels.
Dimensions: 9.2" x 9.75" x 2" (23.4cm x 24.8cm x 5.1cm)
11.5" x 9.75" x 2.1" (29.2cm x 24.8cm x 5.3cm) Including IsoFeet™