You found the MTX Thunder 421D Car Audio Amplifier 

MTX Thunder 421D Car Audio Amplifier Image
Product Rating:
4.5/5 stars
 
This subwoofer amplifier features MTX Audios Adaptive Class D Technology for large power numbers... Read more
This subwoofer amplifier features MTX Audios Adaptive Class D Technology for large power numbers from a very small footprint. Thunder421D features a low pass crossover, variable from 40Hz to 200Hz, this amp also contains both the Thunder EQ bass boost and an EBC2 port. Our "Smart Engage" auto-turn-on circuit makes installation easy. Minimize
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Featured Store Crutchfield 5.0/5.0 store rating
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Amazon 3.5/5.0 store rating
1,589 store reviews
 
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Get free shipping on orders over $25!
Crutchfield 5.0/5.0 store rating
3,274 store reviews
 
In stock
30-Day Money-back Guarantee!
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eBay 4.0/5.0 store rating
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Circuit City 3.5/5.0 store rating
778 store reviews
 
In stock
Free Shipping on $24 and up
Crutchfield 5.0/5.0 store rating
3,274 store reviews
 
In stock
30-Day Money-back Guarantee!
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eBay 4.0/5.0 store rating
1,135 store reviews
 
In stock
 
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Product Description

This subwoofer amplifier features MTX Audios Adaptive Class D Technology for large power numbers from a very small footprint. Thunder421D features a low pass crossover, variable from 40Hz to 200Hz, this amp also contains both the Thunder EQ bass boost and an EBC2 port. Our "Smart Engage" auto-turn-on circuit makes installation easy.

Key Product Details

Amplifier Type Mono Channel
 
Bridgable Not Bridgable
 
RMS Power at 4 Ohms 150 W x 1
 
RMS Power at 2 Ohms 300 W x 1
   Product details

Product Reviews

Average Rating: 4.5/5 stars Read 2 reviews | Write a review
 
Author's Rating: 4/5 stars
Sound Quality: 3/5 stars
Ease of Use: 4/5 stars
Durability: 4/5 stars

by marcrocks,  Apr 3, 2007
Pros: Powerful, inexpensive, visually appealing.
Cons: Refurbished is a warning sign - don't buy refurbished products.
The Bottom Line: Buy this for cheap boom.
 
Author's Rating: 5/5 stars
Sound Quality: 5/5 stars
Ease of Use: 4/5 stars
Durability: 5/5 stars

by davidpoynor,  May 25, 2005
Pros: Lots of clean power...underated
Cons: Better features in amps these days....
   Read 2 reviews

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