DC Audio 90.4 4-Channel Amplifier
Key features
- Amplifier channels: 4
- RMS per channel at 4 ohms: 90 W
- RMS per channel at 2 ohms: 130 W
- Frequency response: 20 Hz–20 kHz
- Input sensitivity: 0.2–6 V
- Power-input terminal size: 4 AWG
DC Audio 90.4 4-Channel Amplifier is backordered and will ship as soon as it is back in stock.
Description
Description
Product Overview
Shape a detailed car-audio soundstage with the DC Audio 90.4 4-Channel Amplifier, a Class A/B amplifier with a fully active crossover. It delivers 90 W RMS per channel at 4 ohms and gives you independent filtering options for system tuning.
Use it to power a front stage, or bridge a channel pair for a subwoofer as part of an SQ-focused build. Its crossover selectors and adjustable filters let you tailor each channel pair to its role.
Key Features & Benefits
- Power across channel options: Rated at 90 W RMS per channel at 4 ohms, 130 W per channel at 2 ohms, and 250 W per bridged pair at 4 ohms.
- Active crossover controls: Select HPF, FULL, or LP-BP to shape channel output for your system configuration.
- Adjustable subsonic filters: The CH1/2 and CH3/4 filters each adjust from 10 Hz to 100 Hz.
- Midrange shaping: Variable high-pass and band-pass filtering supports more controlled frequency selection for connected drivers.
- Heavy-gauge connections: 4 AWG power and ground inputs and 8 AWG speaker connections support the specified wiring connections.
- System monitoring: Power and Protect LED indicators give you a quick visual status check.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | DC Audio |
| Model | 90.4k |
| Amplifier type | 4-channel Class A/B |
| Power output | 90 W RMS per channel at 4 ohms; 130 W per channel at 2 ohms; 250 W per bridged pair at 4 ohms (500 W total) |
| Input sensitivity | 6V~0.2V |
| Frequency response | 20 Hz–20 kHz |
| Crossover slope | 12 dB / Octave |
| Crossover | Yes; fully active, with independent channel filtering |
| CH1/2 subsonic filter | 10 Hz ~ 100 Hz |
| CH1/2 crossover range | 50 Hz (500 Hz) ~ 500 Hz (5 kHz) |
| CH1/2 crossover multiply | x1, x10 |
| CH1/2 crossover selector switch | HPF / FULL / LP-BP |
| CH1/2 bass boost | 0~18 dB |
| CH3/4 subsonic filter | 10 Hz ~ 100 Hz |
| CH3/4 crossover range | 50 Hz (500 Hz) ~ 500 Hz (5 kHz) |
| CH3/4 crossover multiply | x1, x10 |
| CH3/4 crossover selector switch | HPF / FULL / LP-BP |
| CH3/4 bass boost | 0~18 dB |
| Remote control | Yes; remote capability for sub-level adjustment where supported |
| Signal-to-noise ratio | 105 dB |
| Damping factor | 200< |
| THD @ 4 ohms | Less than 0.1% |
| On-board fuse rating | 80 amp |
| LED status lights | Power and Protect |
| Power and ground inputs | 4 AWG |
| Speaker connections | 8 AWG |
| Heatsink length | 14.00" / 350 mm |
| Heatsink width | 9.38" / 238 mm |
| Heatsink height | 2.35" / 59.6 mm |
Why Choose This Product?
The DC Audio 90.4 combines multi-channel power with filtering options for listeners who want hands-on control over system tuning. Its 105 dB signal-to-noise ratio and THD below 0.1% at 4 ohms are useful reference points when comparing amplifier specifications for a sound-quality-focused build.
Adjustable crossover ranges, selectable filter modes, and bass boost give you several ways to tailor the channel pairs. The listed power ratings also clarify its output at different loads, including bridged operation.
Installation & Compatibility Notes
Plan your system around the amplifier’s 4-channel configuration, supported loads, and specified power ratings. Confirm that your speakers, source, and intended wiring configuration match the amplifier’s requirements before installation.
Allow space for the heatsink, which measures 14.00" long, 9.38" wide, and 2.35" high. The amplifier has 4 AWG power and ground inputs and 8 AWG speaker connections.
Frequently Asked Questions
How much power does the DC Audio 90.4 produce?
It is rated for 90 W RMS per channel at 4 ohms, 130 W per channel at 2 ohms, and 250 W per bridged pair at 4 ohms.
What crossover modes can I select?
The crossover selector offers HPF, FULL, and LP-BP modes. The amplifier also has x1 and x10 crossover multiply options.
What is the subsonic filter range?
Both channel pairs have a subsonic filter range of 10 Hz to 100 Hz.
Can I bridge channels for a subwoofer?
The listed rating is 250 W per bridged pair at 4 ohms. Confirm your subwoofer’s impedance and wiring configuration are appropriate for that rating.
What are the amplifier’s dimensions?
The heatsink measures 14.00" × 9.38" × 2.35" (350 mm × 238 mm × 59.6 mm).
Explore More
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| DC Amp Model: | 90.4k |
|---|---|
| Input Sensitivity | 6V~0.2V |
| Frequency Response | Hz20Hz~20KHz |
| 12dB / Octave Crossover | YES |
| CH1/2Subsonic Filter | 10Hz ~ 100Hz |
| Crossover | 50Hz(500Hz) ~ 5ooHz(5KHZ) |
| Multiply | x1, x10 |
| Crossover Selector Switch | HPF / FULL / LP-BP |
| Bass Boost | 0~18dB |
| CH3/4Subsonic Filter | 10Hz ~ 100Hz |
| Crossover | 50Hz(500Hz) ~ 5ooHz(5KHZ) |
| Multiply | x1, x10 |
| Crossover Selector Switch | HPF / FULL / LP-BP |
| Bass Boost | 0~18dB |
| Remote Control | YES |
| Frequency Response | Hz20-20Khs |
| Signal to Noise Ratio | dB105 |
| Damping Factor | 200< |
| THD @ 4ohms | Less than 0.1% |
| Fuse Rating | On Board 80 amp |
| LED Status Lights | Power and Protect |
| Heatsink Length | 14.00"/350mm |
| Heatsink Width | 9.38"/238mm |
| Heatsink Height | 2.35"/59.6mm |
