AMPLIFIERS

1.Gain Controls – These controls are used to match the input sensitivity of the amplifier to the particular source unit that you are using. The controls are factory set to 1Vrms.

2.Thunder EQ – This equalization circuit is used to enhance the low frequency response of the vehicle’s interior. With up to 18 dB of boost and centered at 40Hz, the Bass EQ can be adjusted to meet your own personal taste.

3.Frequency Control – This control is continuously adjustable from 40Hz through 200Hz at 24dB per octave. Factory setting is at 40Hz.

4.RCA Input Jacks – RCA type input jacks for use with source units that have RCA or Line Level Outputs. A source unit with a minimum output level of 200mV is required for proper operation. However, this input will accept levels up to 8Vrms.

5.EBC 2 – The EBC, or Electronic Bass Control, allows a remote bass control to be adjusted from the dri- ver’s seat. If the optional EBC is installed, the bass level will be able to be adjusted to overcome noise and other interference. With EBC 2 multiple amplifiers can be controlled.

6.RCA-Output Jacks – These RCA outputs allow for a signal to be sent to other amplifiers in a daisy-chain configuration. The RCA outputs also allow for multiple bass amplifiers to be level controlled using one EBC.

7.Speaker Level Inputs – This input will allow the Thunder4250D and 6500D to operate from source units with speaker-level outputs. Output speaker leads from the source unit should be tied directly to the wire harness provided with the amplifier.

Wire harness color codes:

 

Grey / Black = Source units right negative (-)

White / Black = Source units left negative (-)

Solid Grey = Source units right positive (+)

Solid White = Source units left positive (+)

With the Smart-Engage™ auto-turn circuit, a remote turn-on wire is not necessary when connecting the speaker-level input wire harness to a high powered source unit. The amplifier will automatically turn on when music is received.

8.Compression Circuit – This new circuit, found on the Thunder6500D and Thunder81000D, prevents the amplifier from going into clipping, even at high SPL levels. The compression circuit allows the listener to play the amplifier at high volume levels, yet protects the speakers against the potential damage that can occur during dynamic musical passages. The circuit is switchable on/off, for those SPL competi- tors who run their amplifiers into clipping on purpose. Warning: Damage to speakers may occur when the compression circuit is in the off position.

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Input Panel Layout

❼

❺

❹

❻

❶ ❷ ❸

 

 

 

 

❽

❺

❹

❻

❶ ❷ ❸

❼

 

 

 

 

❽ ❺

❹

❻

❶ ❷ ❸

 

 

 

 

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MTX Audio Thunder81000D, Thunder6500D, Thunder4250D owner manual ❶ ❷ ❸
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Thunder4250D, Thunder6500D, Thunder81000D specifications

MTX Audio has long been a dominant player in the car audio industry, and their Thunder series amplifiers, including the Thunder81000D, Thunder6500D, and Thunder4250D, exemplify the brand's commitment to delivering exceptional sound quality, innovative technology, and robust performance. Each model is designed to cater to different audio needs and vehicle setups, providing powerful solutions for car audio enthusiasts.

The Thunder81000D is a powerhouse amplifier that boasts an impressive output of 1000 watts RMS at 1 ohm. This model is particularly engineered for subwoofer applications, allowing users to connect multiple subwoofers without compromising sound quality. Featuring MTX Audio's proprietary technology, such as the Advanced Thermal Protection circuit, the Thunder81000D ensures that it remains cool even during extended use. Additionally, it includes a variable low-pass filter, making it easier for users to tailor the sound to their preferences.

The Thunder6500D is another solid option, rated at 650 watts RMS at 1 ohm. This amplifier is known for its robustness and efficiency, making it an excellent choice for mid-range and entry-level audio systems. Featuring a compact design, the Thunder6500D is designed for easy installation in tighter spaces without sacrificing performance. It also includes a bass boost feature, allowing users to enhance low frequencies for a more impactful listening experience. Furthermore, the inclusion of high- and low-level inputs offers versatility for different audio setups.

Finally, the Thunder4250D serves as the ideal solution for those looking for a 4-channel amplifier capable of delivering 250 watts RMS at 2 ohms. This model is perfect for powering full-range speakers or coaxial setups. The Thunder4250D incorporates a 12dB/octave high-pass and low-pass filter, enabling precise sound shaping. With a rugged construction and high-quality components, this amplifier delivers not only power but longevity, ensuring reliable performance over time.

In summary, the MTX Audio Thunder series amplifiers, including the Thunder81000D, Thunder6500D, and Thunder4250D, combine powerful output, innovative technology, and thoughtful design to provide exceptional audio performance. Whether you’re building a full-fledged sound system or enhancing your factory setup, these amplifiers offer the flexibility and power needed to achieve the ultimate listening experience. With their ability to drive subwoofers, full-range speakers, and everything in between, MTX Audio’s Thunder amplifiers are a compelling choice for any car audio enthusiast.
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