DC Audio 90.4 Competition Series Amplifier – 500 Watt 4-Channel Class A/B

Precision Sound. Clean Power. Ultimate Versatility.

Not every great car audio system is built around maximum bass. Sometimes it's about sound quality, clarity, detail, and getting every note exactly where it belongs.

Introducing the DC Audio 90.4 Competition Series 4-Channel Amplifier, a high-performance Class A/B amplifier engineered for car audio enthusiasts who demand exceptional sound quality and complete control over their system.

Delivering 90 watts RMS per channel at 4 ohms and 130 watts RMS per channel at 2 ohms, the DC Audio 90.4 provides clean, controlled power for high-performance component speakers, midrange drivers, and custom sound-quality installations.

With its fully active crossover network, flexible channel configurations, and bridgeable design, this amplifier offers outstanding versatility for both SQ-focused builds and everyday high-performance audio systems.

Want to power your front speakers while using the rear channels to drive a subwoofer? The DC Audio 90.4 can handle that, too.

Built with high-quality internal components and a heavy-duty heatsink, the DC Audio 90.4 combines sound quality, flexibility, and dependable performance in one powerful package.

Clean Sound. Complete Control. DC Audio Performance.

Get On Our Level.

Clean, Controlled Class A/B Power

The DC Audio 90.4 is designed for listeners who appreciate more than just volume.

Its Class A/B amplifier design delivers controlled, high-quality power for demanding full-range speaker systems, making it an excellent choice for sound-quality competitions, active front-stage installations, and premium daily-driven car audio systems.

Producing 90 watts RMS x 4 at 4 ohms, the amplifier provides plenty of power for aftermarket component speakers and high-performance full-range drivers.

At 2 ohms, output increases to 130 watts RMS per channel, providing a total of 520 watts RMS across all four channels.

Need additional power for a different configuration? Bridge the amplifier into two channels for 250 watts RMS x 2 at 4 ohms, delivering 500 watts RMS total.

Whether you're building a dedicated SQ system or looking for a versatile amplifier to power multiple speaker configurations, the DC Audio 90.4 provides the flexibility to make it happen.

Fully Active Crossover System

One of the standout features of the DC Audio 90.4 is its advanced crossover network.

Unlike basic 4-channel amplifiers with limited tuning options, the DC Audio 90.4 features a fully active crossover system designed to provide greater control over the frequencies delivered to your speakers.

With adjustable crossover frequencies, subsonic filters, selectable crossover modes, and x1/x10 frequency multipliers, the 90.4 allows you to tailor your system to your specific speaker configuration.

This makes it an excellent choice for:

• Active front-stage car audio systems

• High-performance component speaker installations

• Dedicated midrange and midbass applications

• Sound-quality competition vehicles

• Front-stage and subwoofer combination systems

• Custom multi-speaker installations

Whether you're tuning for accurate musical reproduction or building a versatile daily-driver system, the DC Audio 90.4 gives you the control needed to optimize your sound.

Designed for Maximum Installation Flexibility

90 Watts RMS Per Channel at 4 Ohms

The DC Audio 90.4 delivers clean, controlled power for high-quality component speakers, coaxial speakers, and full-range audio systems.

130 Watts RMS Per Channel at 2 Ohms

For systems requiring additional output, the amplifier delivers 130 watts RMS per channel at 2 ohms, providing flexibility for properly configured speaker installations.

Bridgeable for 250 Watts RMS x 2

The DC Audio 90.4 can be bridged to produce 250 watts RMS per bridged channel at 4 ohms.

This configuration is ideal for applications requiring additional power from a pair of amplifier channels.

Power Your Front Stage and Subwoofer

One of the most useful features of the DC Audio 90.4 is its ability to power multiple sections of your audio system.

For example, you can use channels 1 and 2 to power your front speakers while bridging channels 3 and 4 to drive a compatible subwoofer.

With the appropriate crossover settings and remote bass control, this configuration offers an excellent solution for compact, versatile audio installations.

Independent Crossover Controls

Both channel pairs feature adjustable crossover settings, allowing you to configure different frequency ranges for different speakers.

Selectable Crossover Modes

Choose between HPF, FULL, and LP/BP crossover modes to tailor amplifier operation to your installation.

Adjustable Bass Boost

Variable bass boost provides additional tuning flexibility for applications where low-frequency adjustment is desired.

Input Mode Switch

The input mode switch provides added flexibility when configuring the amplifier's signal routing.

Heavy-Duty Construction

Built with quality internal components and a substantial heatsink, the DC Audio 90.4 is designed for demanding car audio applications.

4 AWG Power and Ground Connections

The amplifier features 4 AWG power and ground inputs, along with 8 AWG speaker terminals, for dependable installation connections.

Output Power Ratings (RMS)

Configuration	RMS Power	Voltage
4 Ohm Stereo	90W x 4	14.4V
2 Ohm Stereo	130W x 4	14.4V
4 Ohm Bridged	250W x 2	14.4V

Maximum Rated Bridged Output: 500 Watts RMS

Total rated output is 360 watts RMS at 4 ohms stereo, 520 watts RMS at 2 ohms stereo, or 500 watts RMS in bridged mode.

Key Features

• 90 Watts RMS x 4 at 4 Ohms

• 130 Watts RMS x 4 at 2 Ohms

• 250 Watts RMS x 2 Bridged at 4 Ohms

• High-Quality Class A/B Amplifier Design

• Fully Active Crossover Network

• Independent Channel-Pair Crossover Controls

• Variable High-Pass Filter

• Variable Band-Pass Filter

• Adjustable Subsonic Filters

• Selectable HPF / FULL / LP-BP Modes

• x1 / x10 Crossover Frequency Multiplier

• Adjustable Bass Boost

• Input Mode Switch

• Wired Remote Control Support

• Heavy-Duty Heatsink Construction

• 4 AWG Power and Ground Inputs

• 8 AWG Speaker Connections

• Onboard Power and Protect LED Indicators

• Designed for Sound-Quality and High-Performance Audio Systems

• Versatile Front-Stage and Subwoofer Configurations

Complete Technical Specifications

Specification	DC Audio 90.4
Amplifier Type	Class A/B 4-Channel
RMS Power @ 4 Ohms	90W x 4
RMS Power @ 2 Ohms	130W x 4
RMS Power Bridged @ 4 Ohms	250W x 2
Input Sensitivity	6V – 0.2V
Frequency Response	20Hz – 20kHz
Crossover Slope	12dB / Octave
CH 1/2 Subsonic Filter	10Hz – 100Hz
CH 1/2 Crossover	50Hz – 500Hz / 500Hz – 5kHz
CH 1/2 Multiplier	x1 / x10
CH 1/2 Crossover Selector	HPF / FULL / LP-BP
CH 1/2 Bass Boost	0 – 18dB
CH 3/4 Subsonic Filter	10Hz – 100Hz
CH 3/4 Crossover	50Hz – 500Hz / 500Hz – 5kHz
CH 3/4 Multiplier	x1 / x10
CH 3/4 Crossover Selector	HPF / FULL / LP-BP
CH 3/4 Bass Boost	0 – 18dB
Input Mode Switch	Yes
Remote Control	Yes
Signal-to-Noise Ratio	105dB
Damping Factor	Greater Than 200
THD @ 4 Ohms	Less Than 0.1%
Fuse Rating	Onboard 80A
LED Status Indicators	Power / Protect
Amplifier Class	Class A/B
Power Connections	4 AWG Power and Ground
Speaker Connections	8 AWG

Amplifier Dimensions

Measurement	Inches	Millimeters
Heatsink Length	14.00"	350mm
Heatsink Width	9.38"	238mm
Heatsink Height	2.35"	59.6mm

Why Choose the DC Audio 90.4?

At DC Audio, we know that not every customer is chasing the highest possible SPL number.

Some enthusiasts want their music reproduced with exceptional clarity, precise control, and the flexibility to build a system around their personal listening preferences.

That's where the DC Audio 90.4 Competition Series Amplifier stands out.

With its Class A/B design, fully active crossover network, flexible channel configurations, and high-quality construction, the 90.4 is an excellent foundation for a serious sound-quality system.

Whether you're powering premium component speakers, creating a fully active front stage, or running your front speakers and subwoofer from a single amplifier, the DC Audio 90.4 gives you the flexibility to build the system you want.

Because Great Car Audio Isn't Just About Being Loud. It's About Sounding Incredible.

Precision Sound. Clean Power. Complete Control.

DC Audio – Get On Our Level.