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The Pioneer GM-D8400M is a one-channel class D amplifier based on an extra-compact class D circuit.

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Pros

Excellent for single-speaker applications - sufficiently powers 12" speakers up to 500 watts RMS

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Slim, compact construction is great for smaller cars or trucks - easily fits under driver or passenger seat of most vehicles

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Included remote peripheral provides full unit control - great for adjusting levels between songs with varying bass presence

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CEA Compliant certification ensures continuous power - involves little to no intermittence issues as experienced with lower-quality amplifiers

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Cons

Requires careful, intricate wiring to perform at maximum capability - many users will require professional assistance

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Seemingly prone to overheating - may encounter issues even when powering a pair of 250-watt, 12" speakers at 2 ohms

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Not recommended for larger systems - unable to power speakers higher than approximately 600 RMS at 2 ohms

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Edit

 

The Pioneer GM-D8400M is a one-channel class D amplifier based on an extra-compact class D circuit designed for extra-versatile installation. An upgrade from the GM-D7400M, the GM-D8400M supports an increased maximum power (1200w versus 800w). The GM-D8400M, however, maintains the GM-D7400M’s frequency response (10Hz0240Hz) and signal-to-nose ratio (100dB). The GM-D8400M also comes equipped with a Pulse Width Modulator that modulates the audio signal to offer a more fixed frequency, a selectable 50Hz bass boost that lets the user manually control the bass, and built-in-crossovers that correctly route big bass signals to the subwoofer. Priced at $299.95, an $80 increase from the $219.95, the Pioneer GM-D8400M is cited as an optimal solution for consumers seeking the functionality of the GM-D7400M combined with a greater power output.

Features
  • Output Power (4 Ohm,
  • Output Power (2 Ohm,
  • Signal to Noise (1 Watt into 4 Ohms): 80 dBA
  • Signal-to-Noise Ratio: 100dB
  • Peak Music Power: 1200 Watts
  • Number of Channels: 1
  • Load Impedance Capability: 2~8 Ohm
  • Continuous Power (4 ohm): 300W x 1
  • Continuous Power (2 ohm): 600W x 1
  • Frequency Response: 10Hz ~ 240Hz
  • Total Harmonic Distortion: 0.03%
  • Dimensions: 11-3/8" x 2-1/4" x 7-7/8"
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