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AMPLIFIER OWNER’S MANUAL
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• Intelligent Surface Mount Technology
• Patented PWM MOSFET switching power supply (#5,598,325)
• Adaptive Class D technology
• High powered transformer
• High powered stacked inductor
• Pure N-channel design
• Doubles power into 2 ohms
• Real time computerized protection circuit
• Color-coded wire harness for speaker-level input installation
• Smart-Engage™ auto turn on for easy integration with factory head units
• Acoustically Seamless Turn-on/Turn-off (i.e. no noise)
• Low-pass crossover, 85Hz, 24dB/octave low pass
• Switchable Bass Boost @ 0, 6 or 12dB centered at 40Hz
• Low level inputs
• Adjustable input sensitivity
• Nickel-plated, heavy duty terminal block type connectors
• Unique rubber Insulated Iso-Feet™
Features
Specifications
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 its significant improvements
to the amplifier’s electrical and mechanical
properties. ISMT devices feature substantial-
ly shorter internal and external lead lengths.
This reduces stray capacitance and induc-
tance, which results in cleaner and more
accurate musical reproduction with signifi-
cantly 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
RT251D
RMS Power measured at 14.4 Volts DC:
100 Watts x 1 into a 4 Ohm load with less than 1% Thd+N
200 Watts x 1 into a 2 Ohm load with less than 1% Thd+N
Dynamic Power measured at 14.4 Volts DC:
125 Watts x 1 into a 4 Ohm load
250 Watts x 1 into a 2 Ohm load
Signal to Noise Ratio: ≥100dB A-Weighted
Frequency Response: 20Hz-85Hz
Maximum Input: 8Vrms
Bass Boost: Switchable Bass Boost 0, 6, or 12dB centered at 40Hz
Crossover: Fixed @ 85Hz, 18dB/octave low pass
Dimensions: Including Iso-Feet™
7.98" x 9.75" x 2.1" (20.3cm x 24.8cm x 5.3cm)