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The AudioControl EPIC X8D4 is an 8-inch subwoofer from the EPICX Series, rated at 400W RMS (600W max) with dual 4 ohm voice coils (DVC).
This listing is for the EPIC X8D4 (dual 4 ohm). The EPICX Series 8-inch subwoofer is also available as a dual 2 ohm version — choose the impedance that best suits your amplifier and wiring configuration.
Key specifications
- Size: 8 in / 200 mm
- Power handling: 400W RMS / 600W max
- Impedance: dual 4 ohm voice coils (DVC)
- Voice coil: 2 in
- Resonance frequency (Fs): 47.2 Hz
- Efficiency: 83.5 dB
- Cut-out diameter: 7.13 in / 181 mm
- Mounting depth: 4.1 in / 103.9 mm
- Recommended enclosure: 0.65 ft³ sealed or 0.71 ft³ ported (tuned to 40 Hz)
About the EPICX Series
The EPICX Series subwoofers from AudioControl combine strong output with refined audio quality. They deliver tight, accurate low-end response that stays clean at high volume — not just loud.
Precision-engineered with non-pressed paper cones, heavy-duty motor structures and high-quality components, every element is optimised for output, efficiency and durability.
Whether you're building a competition system or a street setup that stands out, the EPICX Series handles power with ease and delivers deep, aggressive bass without sacrificing clarity.
Features
- Composite foam surround: smooth, controlled bass.
- High-precision motor assembly: maximises efficiency and output, converting amplifier power into impactful bass.
- Rigid steel basket: low resonance for tighter bass and clearer sound.
- High-temperature, lightweight voice coil: fast, dynamic bass response and reliability under high power.
- One-piece dust cap design: enhances cone rigidity for consistent, low-distortion bass.
- Non-pressed paper cone: natural warmth, depth and rich low-end character.
- Large-gauge, quick-release black nickel terminals: high conductivity and a secure, vibration-proof connection.
- Engineered to integrate with AudioControl's EPICENTER bass restoration processor for deeper low frequencies.
Explore the full range in AudioControl.
Specification
| Speaker Size | 8 in / 200 mm |
|---|---|
| Power | 400W RMS / 600W Max |
| Impedance | 4 ohms |
| Voice Coil | 2 in |
| Resonance Frequency | 47.2 Hz |
| Efficiency | 83.5 dB |
| Magnet | Dimensions 5.31 x 2.44 x 0.98 in / 135 x 60 x 25 mm |
| Overall Diameter | 8.46 in / 215 mm |
| Cut Out Diameter | 7.13 in / 181 mm |
| Mounting Depth | 4.1 in / 103.9 mm |
| Mounting Height | 0.8 in / 20 mm |
| Motor Diameter (w/ Cover) | 5.5 in / 140 mm |
| External Dimensions | 17″ W × 12″ H × 10.5″ D |
| Net Internal Volume | 0.71 ft3 |
| Exterior Volume | 1.24 ft3 |
| Material Thickness | 0.75 in |
| Port Area | 7.875 sq in |
| Port Inlet | 0.75″ W × 10.5″H |
| Port Length | 16 in |
| Tuning Frequency | 40 Hz |
| External Dimensions | 16″ W × 10.5″ H × 7.5″ D |
| Internal Volume | 0.65 ft3 |
| Material Thickness | 0.75 in |
What's Included
- EPIC X8D4
- Manual
AudioControl
About the AudioControl EPIC X8D4
From our tech experts at CEN
An AudioControl 8 inch subwoofer, 4 ohm, handling 400w RMS.
Who it suits
Drivers building a system where the bass does real work rather than filling in behind the speakers.
Our tech experts advise
A subwoofer is only as good as its enclosure and the amplifier behind it: box volume and tuning decide what you actually hear, and impedance decides how it should be wired. We build enclosures to suit both driver and vehicle at our Beeston workshop. Installation is priced per vehicle, so get in touch with your make, model and year and we will confirm what it needs. See car audio installation.
Explore the full AudioControl range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all AudioControl
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Frequently Asked Questions
Q: Do I need an amplifier for this subwoofer?
A: Yes, unless it is an active (powered) subwoofer with a built-in amplifier. Passive subwoofers need an external amplifier matched to the RMS power and impedance shown in the Specification tab.
Q: What size enclosure does this subwoofer need?
A: The recommended enclosure volume is listed in the Specification tab where the manufacturer provides it. As a rule, sealed enclosures give tighter, more accurate bass while ported enclosures deliver more output. Contact CEN if you would like a recommendation for your build.
Q: What does RMS power mean?
A: RMS is the continuous power a subwoofer can handle, and it is the number that matters when matching an amplifier. Peak or max figures describe short bursts only. Match your amplifier output to the RMS rating in the Specification tab.
Q: Sealed or ported enclosure - which should I choose?
A: Sealed boxes are compact and produce tight, controlled bass suited to sound quality builds. Ported boxes are larger and produce more output at low frequencies, suited to those who want maximum impact. Either works well when built to the recommended volume.
Q: Can CEN build or supply an enclosure and fit everything?
A: Yes. CEN supplies enclosures and offers professional installation from our Nottingham premises, including amplifier wiring. Contact us to discuss your build.
Q: Is the EPIC X8D4 a 2 ohm or 4 ohm subwoofer?
A: The EPIC X8D4 has dual 4 ohm voice coils (DVC). AudioControl also makes a dual 2 ohm version of the same 8 inch EPICX subwoofer.
Q: What box does the EPICX 8 inch subwoofer need?
A: AudioControl recommends a sealed enclosure of 0.65 ft3 internal volume, or a ported enclosure of 0.71 ft3 net internal volume tuned to 40 Hz. Full enclosure dimensions are listed in the Specification tab.
Q: What is the mounting depth of the EPIC X8D4?
A: The mounting depth is 4.1 in / 103.9 mm and the cut-out diameter is 7.13 in / 181 mm.
