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Description

DS18 FX4

The DS18 FX4 is a flush mount / surface mount 4-channel Class D car audio amplifier engineered for clean, high-efficiency multi-speaker sound in custom installations. Designed with a premium acrylic cover for stylish presentation and rugged construction for long-lasting performance, it delivers 4 × 180 Watts RMS @ 4 Ω of stable Class D power. This amplifier provides low distortion, efficient heat management, and advanced protection circuitry, making it perfect for powering full-range speakers in cars, boats, or custom audio builds where both power and aesthetics are important.


Specifications

Item Specification
SKU FX4
Amplifier Class Digital (Class D)
Amplifier Type Stereo Full Range
Number of Channels 4
Total Watts (Peak) 3000W
Minimum Impedance 2Ω Stereo / 4Ω Bridge
Body Color / Finish Black Aluminum
Waterproof Rating IP65 (Flush Mounting)

Power Output
Configuration RMS Power
@ 4 Ohm 4 × 180W
@ 2 Ohm 4 × 250W
@ 1 Ohm N/A
@ 4 Ohm (Bridged) 2 × 500W

Audio Performance
Parameter Value
Frequency Response 20Hz – 20kHz
Signal-to-Noise Ratio 87 dB
Efficiency @ 4Ω 79%
Damping Factor 80
Input Impedance 28 kΩ
Channel Separation 60 dB
Total Harmonic Distortion (THD) 0.15%
Low Level Input Range 0.3 – 6 V

Crossover & Signal Control
Feature Specification
Selectable Crossover LPF / HPF / FULL
Crossover Filter Range 40 Hz – 2 kHz
Bass Boost Range 0 – 12 dB
Bass Boost Frequency 50 Hz
Infrasonic Filter N/A
Phase Selector N/A
High Level Input N/A

Features & Protection
Feature Availability
LED Indicator Power / Protect / Clip
Thermal Protection Yes
Over-Load Protection Yes
DC Output Protection Yes
Short Circuit Protection Yes
Voltage Input Protection Yes (8.5 – 16.8V)
Clipping Protection Yes
Cooling Fan No
Voltmeter No
Remote Level Control No

Inputs & Connectivity
Feature Specification
Input Channel Selectable Yes (2 / 4 Channels)
RCA Low Level Output Yes
Tiffany RCA Connector Yes
Power Input Terminal Size 4 Ga
Fuse Size 80A (2 × 40A)

Construction & Design Features
Feature Included
Very High Efficiency Digital Circuit Design Yes
Anti-Corrosion PCB Coating Yes
Surface Mount Component Technology Yes
Audio Precision QC Verification Yes
Digital Chasing LED Adapter Yes (Included)

Dimensions & Weight
Measurement Value
Body Length 9″ / 228 mm
Body Width 4.7″ / 120 mm
Overall Height 1.85″ / 47 mm
Heatsink Length 10.8″ / 275 mm
Heatsink Width 7.2″ / 182 mm
Mounting Hole Spacing 9.2″ × 5.8″ / 233.7 × 147 mm
Mounting Depth 1.5″ / 39 mm
Gross Weight (Single Unit) 2.75 kg

 


Product Overview

4 – Channel Full Range Flush Or Surface Mount Class-D Amplifier

Experience the pinnacle of car audio performance with DS18’s FX4!
Designed and manufactured specifically for professional car audio applications, the FX4 combines high-quality sound and a compact footprint for effortless installation.
The FX Series from DS18 offers a unique advantage over standard amplifiers – the ability to be installed in both flush and surface applications. With the included surface mode adapter, the FX4 can seamlessly integrate into any custom car audio build, ensuring optimal performance without sacrificing space or style. Plus, this frame has Digital LED’s controlled by a Built-In Digital Light Module!
Featuring an IP65 water-resistant design (when flush mounted) and coated 4-layer PCB, this amplifier is built to withstand harsh conditions and prevent corrosion. The flush or surface installation mode makes it easy to install on ATV/RV roofs, boat walls, car audio panels, or racks, ensuring a clean and professional look.
With its stable and reliable Class D circuit design, LED clipping indicator for easier adjustment, selectable/variable crossovers, direct insert power and speaker terminals, and easy installation process, the FX4 is a true powerhouse in the world of car audio.
Delivering MAX power of 3000W and RMS power of 180W x 4 at 4 ohm, 250W x 4 at 2-ohm, and 500W x 2 at 4-ohm Bridge; the FX4 packs a powerful punch.
Elevate your car audio experience to new heights with DS18’s FX4!
*The FX Series adapters are not designed to be water-resistant. Please exercise caution to prevent water contact with the DIGITAL LED’S, as exposure may result in a short circuit*

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Questions and Answers

Q1: What is the DS18 FX4?

A1: The DS18 FX4 is a 4-channel Class D car audio amplifier designed to power multiple speakers with clear, efficient output.

Q2: How many channels does the FX4 have?

A2: It has 4 channels, ideal for powering front and rear speakers or a full set of mids/tweeters.

Q3: What power output does it produce?

A3: It delivers 4 × 180 W RMS @ 4 Ω, providing stable, distortion-free performance.

Q4: Where is this amplifier best used?

A4: It’s ideal for flush mount or surface mount custom installations in cars, boats, or audio show builds.

Q5: What protection features does it include?

A5: Yes — it includes thermal, overload, short-circuit, and voltage protection to safeguard the amplifier and connected speakers.


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