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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. 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 substantially shorter internal and external lead lengths. This reduces stray capacitance and inductance, which results in cleaner and more accurate musical reproduction 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, 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: Specifications • Thunder Amplifiers are Covered of the Following United States of America Patents: #5,598,325, #5,631,608, #5,783,970 • • Adaptive Class D Technology Buffered RCA Output for Daisy-Chaining Multiple Amplifiers • • • Acoustically Seamless Turn-On/Turn-Off Adjustable Input Sensitivity Anti-Shock PCB Mounting Design • • Color-Coded Wire Harness for Speaker-Level Input Installation External Bass Control (EBC) Port • • • High Powered Transformer Intelligent Surface Mount Technology Nickel-Plated, Heavy Duty Terminal • • • High Power Inductor Output Filter Pure N-Channel Design Speaker and Low Level Inputs Block Connectors • Thunder EQ Bass Enhancement • • Patented PWM MOSFET Switching Power Supply Real Time Computerized Protection Circuit • Smart-Engage™ Auto Turn-On for Easy Integration with Factory Head Units • • Unique Rubber Insulated Iso-Feet™ 24dB/Octave Crossover • (THUNDER421D, THUNDER801D) Phase Select (Thunder1501D) THUNDER421D • RMS Power measured at 12.5 Volts DC: 150 Watts x 1 into a 4 Ohm load with less than 1% Thd+N 300 Watts x 1 into a 2 Ohm load with less than 1% Thd+N • Dynamic Power measured at 14.4 Volts DC: 210 Watts x 1 into a 4 Ohm load 420 Watts x 1 into a 2 Ohm load • Signal to Noise Ratio: . 100dB A-Weighted • Damping Factor: >100 • Frequency Response: 20Hz-200Hz ± 3dB • Maximum Input: 8Vrms • Thunder EQ: Variable Bass Boost (0-18dB) centered at 40Hz • Crossover: Variable 40Hz to 200Hz, 24dB/Octave Low Pass • Dimensions: 9.4" x 9.75" x 2.1" (23.9cm x 24.8cm x 5.3cm) THUNDER801D • RMS Power measured at 12.5 Volts DC: 250 Watts x 1 into a 4 Ohm load with less than 1% Thd+N 500 Watts x 1 into a 2 Ohm load with less than 1% Thd+N • Dynamic Power measured at 14.4 Volts DC: 400 Watts x 1 into a 4 Ohm load 800 Watts x 1 into a 2 Ohm load • Signal to Noise Ratio: . 100dB A-Weighted • Frequency Response: >100 • Frequency Response: 20Hz-200Hz ± 3dB • Maximum Input: 8Vrms • Thunder EQ: Variable Bass Boost (0-18dB) centered at 40Hz • Crossover: Variable 40Hz to 200Hz, 24dB/Octave Low Pass • Dimensions: 11.5" x 9.75" x 2.1" (29.3cm x 24.8cm x 5.3cm) THUNDER1501D • RMS Power measured at 12.5 Volts DC: 500 Watts x 1 into a 4 Ohm load with le...