AMPLIFIER OWNER’S MANUAL
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CONGRATULATIONS...
on your purchase of a new MTX Audio
Road Thunder Amplifier! MTX has long
been the industry leader in mobile audio,
and we have reached new heights with
the development of the new MTX Road
Thunder amplifiers. You couldn’t have
chosen a more reliable, powerful, or
better performing amplifier.
We manufacture every amplifier using
the latest Intelligent Surface Mount
Technology. Some of the advantages of
the new design are significant improve-
ments 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 reproduction with sig-
nificantly 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.
We want to ensure you get continuous high
performance from your MTX Road 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 online 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™
• Nickel-plated, heavy duty terminal block type connectors
• Speaker and low level inputs
• Input select 2CH/4CH switch on RT404 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
• RT404 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
RT202
RMS Power measured at 14.4 Volts DC:
37.5 Watts x 2 into a 4 Ohm load with < 1% THD
75 Watts x 2 into a 2 Ohm load with < 1% THD
150 Watts bridged into a 4 Ohm load with < 1% THD
Dynamic Power measured at 14.4 Volts DC:
50 Watts x 2 into a 4 Ohm load
100 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)
Frequency Response: 20-20,000 Hz ±.25dB
Crossover: Defeatable, 18dB/octave at 85 Hz,
selectable for high pass, low pass
Dimensions: Including Iso-Feet™
7.98" x 9.75" x 2.1" (20.3cm x 24.8cm x 5.3cm)
RT404
RMS Power measured at 14.4 Volts DC:
37.5 Watts x 4 into a 4 Ohm load with < 1% THD
75 Watts x 4 into a 2 Ohm load with < 1% THD
150 Watts x 2 bridged into a 4 Ohm load with < 1% THD
Dynamic Power measured at 14.4 Volts DC:
50 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)
Frequency Response: 20-20,000 Hz ±.25dB
Crossover: Defeatable, 18dB/octave 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: Including Iso-Feet™
11.5" x 9.75" x 2.1" (29.2cm x 24.8cm x 5.3cm)
