MTX Audio Thunder4250D Congratulations, HOW to USE this Manual, New MTX Thunder amplifiers. You

AMPLIFIERS

Introduction

Features

CONGRATULATIONS...

ENGLISH	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:

•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 on Thunder4250D and 6500D

•Smart-Engage™ auto turn on for easy integration with factory head units Thunder4250D and 6500D

•Acoustically Seamless Turn-on/Turn-off (i.e. no noise)

•Variable frequency low-pass crossover, 40Hz to 200Hz, 24dB/octave low pass

•Defeatable compression circuit included on Thunder6500D and Thunder81000D

•Continuously adjustable and defeatable Bass EQ enhancement circuitry, centered at 40Hz

•Low level inputs

•EBC - External Bass Control Port with an additional 3dB of gain when used, and 23dB attenuation

•Adjustable input sensitivity

•Buffered RCA Outputs for daisy-chaining additional bass amplifiers

•Nickel-plated, heavy duty terminal block type connectors

•Unique rubber Insulated Iso-Feet™

Specifications

THUNDER4250D		THUNDER81000D
RMS Power measured at 12.5 Volts DC:		RMS Power measured at 12.5 Volts DC:
125	Watts x 1 into a 4 Ohm load with less than 1% Thd+N	500 Watts x 1 into a 4 Ohm load with less than 2% Thd+N
250	Watts x 1 into a 2 Ohm load with less than 1% Thd+N	1000 Watts x 1 into a 2 Ohm load with less than 2% Thd+N
Dynamic Power measured at 14.4 Volts DC		Dynamic Power measured at 14.4 Volts DC
200	Watts x 1 into a 4 Ohm load	850 Watts x 1 into a 4 Ohm load
350	Watts x 1 into a 2 Ohm load	1500 Watts x 1 into a 2 Ohm load
Signal to Noise Ratio: ≥ 100dB A-Weighted		Signal to Noise Ratio: ≥ 100dB A-Weighted
Damping Factor: >200		Damping Factor: >100
Frequency Response: 20Hz-200Hz		Frequency Response: 20Hz-200Hz
Maximum Input: 8Vrms		Maximum Input: 8Vrms
Thunder EQ: Variable Bass Boost (0-18dB) centered at 40Hz		Thunder EQ: Variable Bass Boost (0-18dB) centered at 40Hz
Crossover: Variable 40Hz to 200Hz, 24dB/octave low pass		Crossover: Variable 40Hz to 200Hz, 24dB/octave low pass
Dimensions: 7" x 9.75" x 2" (17.8cm x 24.8cm x 5.1cm)		Dimensions:15.4" x 9.75" x 2".(40.1cm x 24.8cm x 5.1cm)
9.9" x 9.75" x 2.1" (23.6cm x 24.8cm x 5.3cm) Including IsoFeet™		17.8" x 9.75" x 2.1" (45.2cm x 24.8cm x 5.3cm) Including IsoFeet™
		Recommended Fuse = 150A
THUNDER6500D
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
450	Watts x 1 into a 4 Ohm load
775	Watts x 1 into a 2 Ohm load

Signal to Noise Ratio: ≥ 100dB A-Weighted

Damping Factor: >200

Frequency Response: 20Hz-200Hz

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" (29.2cm x 24.8cm x 5.1cm)

13.9" x 9.75" x 2.1" (36.6cm x 24.8cm x 5.3cm) Including IsoFeet™

2

3