Pioneer GM-DX874 Class D 4-Channel Bridgeable Amplifier

Sale price $429.00 Regular price $500.00

Big Power, Small Size


“Hi-Res” audio enthusiasts delight, with Pioneer’s GM-DX874 “Hi-Res” compatible 4ch amplifier.

An amplifier shouldn’t take up too much space, especially in your car. The GM-DX874 might just be what you’re looking for. It combines a 1-Ohm stable circuit, installation flexibility and a superior high-power output partnered with “Hi-Res” certification for those of you who only like the best!

Speak to your nearest Authorized Pioneer TS-Z Dealer today for more information.

  “HI-RES” Compatible

Pioneer’s new GM-DX874 Class-D digital amplifier is equipped with high quality sound components and tuning and is compatible with “Hi-Resolution” audio allowing simply the highest quality sound reproduction! The perfect partner to Pioneer’s exclusive speaker range, TS-Z Series!

*The product with Hi-Res AUDIO logo is conformed to High-Resolution Audio standard defined by Japan Audio Society. The logo is used under license from Japan Audio Society.

  Big Power, Small Size

Pioneer’s new extra-efficient Class-D digital amplifiers mark a dramatic improvement in power output capability, yet are 50% smaller than the current GM-Series Class-AB amplifiers. That makes them more versatile in terms of installation as well as performance.

  Improved Circuit Design

To prevent circuit shutdown, Pioneer’s new digital amplifier circuit “Protection Control System” senses its internal temperature and automatically moderates input level accordingly. Stable, durable circuitry lessens the risk of high input power for the unit to achieve 1 Ω connection. This design enhances the flexibility to connect multiple subwoofers to a system.

  Variable Low Pass & High Pass Filter

For extra flexibility, variable LPF and HPF make audio frequency more adjustable according to subwoofer characteristics and personal listening preferences. The LPF and HPF are adjustable from 40 Hz to 500 Hz.

  Speaker Level Inputs

What, you DON’T own a Pioneer head unit? Well, we won’t hold it against you. In fact we’ll even help you build onto your system. Speaker level inputs allow you to connect your OEM unit (or any unit that doesn’t have the typical RCA-type inputs) without having to buy add-on adapters. So, the install goes faster, you save money, and you’ve got a Pioneer amp in your vehicle.


  • “Hi-Res” Certified Amplifier
  • Compact Design for Versatile Installation Options
  • Perfect match for Pioneer TS-Z Series “Hi-Res” Certified Speakers



  • RCA Inputs: 4-CH (Gold Plated)
  • Amplifier Class: CLASS-D
  • Hi-Res Certified: Yes
  • Bridgeable: Yes
  • Warranty: 1 Year
  • Speaker Level Input: Yes
  • Fuse Rating: 30A x 2
  • Bass Boost Remote: Yes
  • Automatic Signal Sensing and Turn-On: Yes
  • Hi-Volt Input Level Control: 200 mV to 6.5 V
  • Terminal Type: Block
  • Load Impedance Allowance (Ohms): 1 to 8
  • Protection Control System: Yes
  • Dimensions: 252mm (W) x 60mm (H) x 215mm (D)


  • Continuous Power (RMS) Output @ 1Ω: 125W RMS x 4
  • Continuous Power (RMS) Output @ 2Ω: 150W RMS x 4
  • Continuous Power (RMS) Output @ 4Ω: 100W RMS x 4
  • Continuous Power (RMS) Output - Bridged @ 4Ω: 300W RMS x 2

Audio Adjustments

  • Low-Pass Crossover Frequency: 40 Hz
  • Low-Pass Slope (dB/octave): -12dB
  • High-Pass Crossover Frequency: 500 Hz
  • Bass Boost Frequency: 50 Hz
  • Bass Boost Level: 0 dB to 18 dB

Audio Specifications

  • Frequency Response: 10 Hz - 50 kHz
  • Total Harmonic Distortion (THD): < 0.5% (100 Hz)
  • Signal-to-Noise (SN) Ratio: > 95dB