MTX 420-Watt Class D Mono Amplifier (Thunder421D)
  | Product Description This subwoofer amplifier features MTX Audio's 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. The "Smart Engage" auto-turn-on circuit makes installation easy. |
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