Pioneer GM-D8704 High Power Class D 4-Channel Bridgeable Car Amplifier (4 * 100W RMS @ 4 ohms, 4 * 150W RMS @ 2ohms)

Product Overview

The Pioneer GM-D8704 is a high-output 4-channel Class-FD digital car amplifier designed to deliver serious power and acoustic clarity while taking up minimal space inside your vehicle. Capable of outputting 100 Watts RMS x 4 at 4 Ohms ($150\text{W RMS x 4 at } 2\Omega$ or $300\text{W RMS x 2}$ bridged), the GM-D8704 gives you the flexibility to drive a complete 4-speaker system, a 2-speaker plus subwoofer setup, or high-power component stages.

Refined Class-FD Topology & Intelligent Protection

Utilizing Pioneer's Class-FD switching technology, this amplifier achieves high power efficiency with minimal heat buildup, allowing for a chassis footprint up to 50% smaller than conventional Class-AB amplifiers. The integrated Protection Control System monitors internal thermal conditions in real time, automatically adjusting input levels when needed to prevent thermal shutdowns and ensure uninterrupted playback.

Seamless Integration & Onboard Bass Tuning

Engineered for both aftermarket and factory OEM systems, the GM-D8704 features Automatic Signal Sensing and Turn-On, eliminating the need for a separate remote lead when tapping into factory speaker wires. Custom sound shaping is easy with variable High-Pass (HPF) and Low-Pass (LPF) crossovers ($40\text{--}500\text{ Hz}$), $1\Omega$ stable circuitry capability, and an included wired remote bass boost knob ($0\text{--}18\text{ dB at } 50\text{ Hz}$) for Channel B.

Features of GM-D8704

Variable HPF/LPF

For Extra flexibility, variable LPF & HPF make audio frequency more adjustable according to subwoofer characteristics and personal listening preferences

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Bass Boost Remote

Every new class D Amplifier has a Bass Boost Remote Controller for optimal bass level adjustment according to listening preferences and music characteristics.

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Highly Reliable 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-ohm connection. This design enhances the flexibility to connect multiple subwoofers to a system.

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Other features of GM-D8704

Automatic Signal Sensing & Turn ON

Pioneer Class D Amplifier automatically select an input signal mode between the RCA Level and the speaker level selecting an input signal

Channel and power

No. of Channels: 4/3/2

Max. Wattage (4 ohms): 200W X 4

Max. Wattage  (2 ohms): 300W X 4

Max. Wattage  (1 ohm): 1200W (Total)

Wattage RMS (4 ohm <= 1% THD+N): 100W x 4 (20-20kHz)

Wattage RMS (2 ohm <= 1% THD+N): 150W x 4 (1kHz)

Wattage RMS (1 ohm <= 1% THD+N): >125WX4 (1kHz)

Wattage RMS (4 ohm, Bridged): 300W x 2 (1kHz)

General Features

Distortion (100Hz, 4 ohm, 10w): < 0.05%

S/N Ratio (IEC-A/IHF-A N/W): >95dB

Frequency response: 10-50kHz (0,-3dB)

Max. Input Level (RCA): 6.5V (Low)

Max. Input Level (SP-Input): 16v (High)

Load Impedance: 1-8 ohm

Amplifier Class: Class D

Transistor: MOSFET

Input level control (RCA-IN): (200mv-6.5v)

Input level control (SP-IN): (0.8v-16v) (High)

Frequency: 50Hz (CH-B)

Bass Boost: 0-18dB

Bass Boost Remote: Yes (CH-B)

Low Pass Filter: 40-500Hz, -12dB/oct

High Pass Filter: 40-500Hz, -12dB/oct

Protection Indicator: RED (Side Panel)

• No. of Channels: 4/3/2 Max. Wattage (4 ohms): 200W X 4 Max. Wattage (2 ohms): 300W X 4 Max. Wattage (1 ohm): 1200W (Total) Wattage RMS (4 ohm @ 1% THD+N): 100W x 4 (20-20kHz) Wattage RMS (2 ohm @ 1% THD+N): 150W x 4 (1kHz) Wattage RMS (1 ohm @ 1% THD+N): @ 125WX4 (1kHz) Wattage RMS (4 ohm, Bridged): 300W x 2 (1kHz)
• Distortion (100Hz, 4 ohm, 10w): 95dB Frequency response: 10-50kHz (0,-3dB) Max. Input Level (RCA): 6.5V (Low) Max. Input Level (SP-Input): 16v (High) Load Impedance: 1-8 ohm Amplifier Class: Class D Transistor: MOSFET Input level control (RCA-IN): (200mv-6.5v) Input level control (SP-IN): (0.8v-16v) (High)
• Frequency: 50Hz (CH-B) Bass Boost: 0-18dB Bass Boost Remote: Yes (CH-B) Low Pass Filter: 40-500Hz, -12dB/oct High Pass Filter: 40-500Hz, -12dB/oct Protection Indicator: RED (Side Panel) Power Indicator: BLUE (Side Panel)
• Chassis size (W x H x D): 252 mm x 60 mm x 215 mm

1,200 Watts Max. Class-D 4-Channel Bridgeable Amplifier with Wired Bass Boost Remote.-------------- An amplifier shouldn’t take up too much space, especially in your car. The GM-D8704 might just be what you’re looking for. It combines a 1-Ohm stable circuit, installation flexibility, and superior high-power output.--------------- For Extra flexibility, variable LPF & HPF make audio frequency more adjustable according to subwoofer characteristics and personal listening preferences.--------------- Every new class D Amplifier has a Bass Boost Remote Controller for optimal bass level adjustment according to listening preferences and music characteristics.---------------- 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-ohm connection. This design enhances the flexibility to connect multiple subwoofers to a system.---------------- Pioneer Class D Amplifier automatically select an input signal mode between the RCA Level and the speaker level selecting an input signal.