DS18 G1800.4D 4-Channel Class D Full Range Amplifier | 4 x 150W RMS | 1800W Max 

Upgrade your audio system with the DS18 G1800.4D, a high-performance 4-channel Class D amplifier engineered to deliver clean, dependable power for speakers, component systems, and custom audio builds. Whether you're upgrading a daily driver, building a high-output pro audio system, or installing a premium Jeep or truck audio system, the G1800.4D delivers the efficiency, flexibility, and performance serious enthusiasts expect.

With 4 x 150 Watts RMS at 4 Ohms, 4 x 230 Watts RMS at 2 Ohms, and 2 x 430 Watts RMS bridged at 4 Ohms, this amplifier provides real-world power that allows your speakers to perform at their full potential while maintaining excellent sound quality and long-term reliability.

Why You'll Love It

✔ 4 x 150 Watts RMS @ 4 Ohms for clean, reliable speaker power

✔ 4 x 230 Watts RMS @ 2 Ohms for increased output

✔ 2 x 430 Watts RMS Bridged @ 4 Ohms for flexible system design

✔ Efficient Class D Technology reduces heat while maximizing performance

✔ Built-In High-Pass & Low-Pass Crossovers simplify system tuning

✔ Power, Protection & Clip Indicators help protect your equipment

✔ Compact chassis fits where many larger amplifiers won't

✔ Designed for enthusiasts who demand reliable, high-output performance

Perfect For

• Four 6.5" Midrange Speakers

• Four 8" Pro Audio Speakers

• Premium Component Speaker Systems

• Front & Rear Speaker Upgrades

• Jeep Audio Systems

• Truck Audio Systems

• Daily Driver Sound Quality Builds

• Competition-Inspired Speaker Systems

Product Overview

The DS18 G1800.4D is built for enthusiasts who want more than impressive peak power numbers—they want clean RMS power that allows their speakers to perform at their best. Designed around an efficient full-range Class D platform, this amplifier delivers excellent output while minimizing heat and current draw, making it ideal for modern vehicle installations where both performance and efficiency matter.

With selectable High-Pass, Low-Pass, and Full-Range crossover settings, the G1800.4D adapts easily to a wide variety of system configurations. Whether you're powering four high-performance coaxial speakers, a complete component speaker system, or bridging channels for increased output, this amplifier offers the flexibility needed for virtually any custom installation.

DS18 also equipped the G1800.4D with Power, Protection, and Clip Indicator LEDs to help monitor amplifier performance during operation. These indicators provide valuable feedback during system tuning and help reduce the risk of speaker damage caused by clipping.

Engineered using advanced surface-mount component technology and tested for excellent sound quality, the G1800.4D combines impressive performance with long-term durability. Built-in short circuit, thermal, and voltage protection work together to safeguard both the amplifier and the rest of your audio system.

What Does This Amplifier Power Best?

The G1800.4D is an excellent choice for customers looking to power:

• Four speakers rated around 100–175 Watts RMS each

• Four DS18 PRO-X Series midrange speakers

• Four high-performance coaxial speakers

• Front and rear component speaker systems

• High-output Jeep and truck speaker upgrades

Its combination of clean RMS power and flexible crossover controls makes it an outstanding amplifier for customers who want loud, detailed audio without stepping up to multiple amplifiers.

Key Features

• Full-Range 4-Channel Class D Amplifier
• 1800 Watts Maximum Power
• 4 × 150 Watts RMS @ 4 Ohms
• 4 × 230 Watts RMS @ 2 Ohms
• 2 × 430 Watts RMS Bridged @ 4 Ohms
• Stable at 2 Ohms Stereo / 4 Ohms Bridged
• Built-In High-Pass & Low-Pass Crossovers
• LPF / HPF / Full Range Selection
• Surface Mount Component Technology
• Power, Protection & Clip Indicator LEDs
• Short Circuit Protection
• Thermal Protection
• Voltage Protection
• Active Cooling Fan
• Compact Matte Black Chassis

Technical Specifications

Brand: DS18

Model: G1800.4D

SKU: G1800.4D

Amplifier Class: Digital (Class D)

Amplifier Type: Full Range 4-Channel

Channels: 4

Maximum Power: 1800 Watts

RMS Power @ 4 Ohms: 4 × 150 Watts

RMS Power @ 2 Ohms: 4 × 230 Watts

Bridged RMS @ 4 Ohms: 2 × 430 Watts

Minimum Speaker Load: 2 Ohms Stereo / 4 Ohms Bridged

Operating Voltage: 15V

Frequency Response: 20Hz – 20kHz

Signal-to-Noise Ratio: >90dB

Total Harmonic Distortion: 0.01%

Efficiency @ 4 Ohms: 81%

Damping Factor: 78

Input Sensitivity: 0.25V – 6V

Selectable Crossover: LPF / FLAT / HPF

High-Pass Filter: 50Hz – 250Hz

Low-Pass Filter: 50Hz – 250Hz

Subsonic Filter: No

Bass Boost: No

Phase Control: No

High-Level Input: Yes

LED Indicators: Power / Protection / Clip

Voltage Protection: Yes

Clipping Protection: Yes

Thermal Protection: Yes

Cooling Fan: Yes

Power Wire Input: 4 Gauge

Speaker Wire Output: 12 Gauge

Fuse Rating: 80A

Remote Bass Knob: No

Finish: Matte Black

Dimensions (L × W × H): 12.25" × 6.25" × 3.25"

Weight: 4 lbs

___________________________________________________________________________

What's Included

• (1) DS18 G1800.4D 4-Channel Class D Amplifier
• Installation Hardware
• Owner's Manual

Installation Notes

The DS18 G1800.4D is designed for a wide range of aftermarket audio systems and is stable down to 2 Ohms stereo or 4 Ohms bridged. For best performance, we recommend using 4 AWG OFC power and ground wire along with a properly fused power connection installed as close to the battery as possible.

The amplifier features adjustable High-Pass, Low-Pass, and Full Range crossover modes, allowing it to power everything from coaxial speakers and component systems to high-output pro audio midrange speakers. Proper gain adjustment is critical for maximizing sound quality while preventing clipping and speaker damage.

Pro Audio Center Tip

One of the most common mistakes we see is customers choosing an amplifier based only on maximum power ratings. In reality, RMS power is what determines how well an amplifier matches your speakers.

The G1800.4D's 150 Watts RMS x 4 makes it an excellent match for many premium speakers in the 100–175 Watt RMS range, delivering clean power with plenty of headroom instead of constantly pushing the amplifier to its limits.

Build Your System

Complete your installation with:

• DS18 PRO-X6.4M 6.5" Pro Audio Midrange Speakers

• DS18 PRO-X8.4M 8" Pro Audio Midrange Speakers

• DS18 NXL-6M Marine Speakers

• 4 Gauge OFC Amplifier Wiring Kit

• High-Quality RCA Interconnects

• Speaker Wire

• Distribution Block

• AGM Battery Upgrade (For Larger Systems)

Expert Recommendation from Pro Audio Center

The G1800.4D has quickly become one of our favorite four-channel amplifiers because it delivers honest RMS power in a compact footprint that's easy to install in almost any vehicle.

We especially like pairing it with the DS18 PRO-X6.4M or PRO-X8.4M when building loud, high-output speaker systems. It also performs exceptionally well with premium coaxial speakers and component systems where clean, consistent power is more important than inflated peak power numbers.

The efficient Class D design helps minimize heat while still providing the output needed to overcome road, wind, and engine noise. If you're looking for a reliable amplifier that offers flexibility for future upgrades, the G1800.4D is an outstanding choice.

Why Buy From Pro Audio Center?

At Pro Audio Center, we believe buying an amplifier should be about more than simply comparing wattage numbers. We help customers choose equipment that works together as a complete system, ensuring better performance, improved reliability, and a more enjoyable listening experience.

When you purchase from Pro Audio Center, you're buying from a team with real-world experience designing and installing mobile electronics systems. Whether you're upgrading a daily driver, building a competition-inspired setup, or outfitting a Jeep, boat, or powersports vehicle, we're here to help you build your system with confidence.

Frequently Asked Questions

Is the G1800.4D a full-range amplifier?

Yes. The G1800.4D is a full-range Class D amplifier capable of powering coaxial speakers, component speakers, pro audio midrange speakers, and other full-range applications.

How much RMS power does this amplifier produce?

The G1800.4D delivers:

• 150 Watts RMS x 4 @ 4 Ohms
• 230 Watts RMS x 4 @ 2 Ohms
• 430 Watts RMS x 2 Bridged @ 4 Ohms

What speakers pair well with this amplifier?

This amplifier is an excellent choice for four premium 6.5-inch or 8-inch speakers in the 100–175 Watt RMS range. It's particularly well suited for high-output pro audio speakers, premium coaxial speakers, component speaker systems, and many marine speaker applications.

Can this amplifier power subwoofers?

Yes, when bridged into two channels, the G1800.4D can power certain subwoofer applications. However, it is primarily designed as a full-range speaker amplifier. Dedicated monoblock amplifiers are generally recommended for larger subwoofer systems.

Does the amplifier have built-in crossovers?

Yes. The G1800.4D includes selectable High-Pass, Low-Pass, and Full Range crossover settings, making it easy to configure for a variety of speaker applications.

What size power wire should I use?

For best performance, we recommend using a quality 4 AWG OFC amplifier wiring kit with the appropriate fuse installed near the battery.