AudioControl EPICX8D4 Review: Specifications, Fitment and Comparisons
Quick summary: the buying decision
The EPICX8D4 is an 8-inch EPICX Series subwoofer with dual 4-ohm voice coils, rated at 400 W RMS / 600 W max. It needs an enclosure and a mono amplifier; AudioControl publishes both sealed and ported box recommendations, which makes it straightforward to build or order a box that suits the driver. Mounting depth is 103.9 mm (4.1 in), so check the space behind the baffle before you commit.
AudioControl EPICX8D4: what it is
The AudioControl EPICX8D4 is an 8-inch (200 mm) EPICX Series subwoofer with dual 4-ohm voice coils, rated at 400 W RMS and 600 W max. A non-pressed paper cone, heavy-duty motor and rigid steel basket give tight, accurate bass that stays clean at high volume.
EPICX Series subwoofers use a non-pressed paper cone, a composite foam surround, a one-piece dust cap, a high-precision motor with a high-temperature lightweight voice coil and a rigid steel basket, and they are designed to pair with AudioControl's The Epicenter bass restoration processor. They have dual 4-ohm voice coils for flexible wiring.
Key features
Composite foam surround and one-piece dust cap for smooth, controlled and accurate bass
High-precision motor assembly with a high-temperature, lightweight voice coil
Rigid steel basket that resists resonance for tighter bass
Large-gauge, quick-release black nickel terminals
Designed to pair with AudioControl's The Epicenter bass restoration processor
Specifications explained
The EPICX8D4 is rated at 400 W RMS / 600 W max with dual 4 ohm voice coils (2 in diameter). AudioControl quotes a free-air resonance (Fs) of 47.2 Hz and an efficiency of 83.5 dB; the cone is non-pressed paper and the magnet measures 135 x 60 x 25 mm (5.31 x 2.44 x 0.98 in).
Fitment: overall diameter 215 mm (8.46 in), cut-out 181 mm (7.13 in), mounting depth 103.9 mm (4.1 in) and mounting height 20 mm (0.8 in).
Full specifications as published by AudioControl:
Model: EPICX8D4
Type: 8 in dual voice coil subwoofer driver
Size: 8 in (200 mm)
Voice coils: Dual 4 ohm, 2 in
Power handling: 400 W RMS / 600 W max
Resonance frequency (Fs): 47.2 Hz
Efficiency: 83.5 dB
Cone: Non-pressed paper
Magnet: 135 x 60 x 25 mm (5.31 x 2.44 x 0.98 in)
Overall diameter: 215 mm (8.46 in)
Cut-out diameter: 181 mm (7.13 in)
Mounting depth: 103.9 mm (4.1 in)
Mounting height: 20 mm (0.8 in)
Motor diameter (with cover): 140 mm (5.5 in)
Sealed enclosure: 0.65 cu ft internal; 16 x 10.5 x 7.5 in external (W x H x D)
Ported enclosure: 0.71 cu ft net, tuned to 40 Hz; 17 x 12 x 10.5 in external; port 0.75 x 10.5 in, 16 in long
In the box: EPICX8D4 subwoofer, user guide
Enclosure: what AudioControl recommends
AudioControl's recommendations for the EPICX8D4:
Sealed: 0.65 cu ft (18.4 L) internal; 16 x 10.5 x 7.5 in external (W x H x D)
Ported: 0.71 cu ft (20.1 L) net, tuned to 40 Hz; 17 x 12 x 10.5 in external; port 0.75 x 10.5 in, 16 in long
A sealed box gives tighter, more controlled bass and needs less space; a ported box plays louder and lower around its tuning frequency but is usually larger and needs a subsonic filter to protect the driver below tuning. Seal and brace the box well, and keep it away from rattling trim.
Wiring and amplifier matching
Each voice coil is 4 ohm: wire them in parallel for 2 ohm or in series for 8 ohm. Two subwoofers with coils in parallel, then wired in parallel with each other, present 1 ohm. With both voice coils in parallel (2 ohm), the EPIC750 gives up to 500 W, so set its gain to keep one EPICX8D4 within its 400 W RMS rating; two EPICX8D4s wired to 1 ohm on the same amplifier get about 375 W each (750 W at 1 ohm).
Set the amplifier gain with a test tone or an oscilloscope rather than by ear, and use the low-pass filter to blend the subwoofer with the front speakers.
How it compares
Related AudioControl subwoofers at VA3 Car Studio:
AudioControl EPICX10D4: 10 in, dual 4 ohm, 500 W RMS / 750 W max, mounting depth 135.8 mm, ₹21,240
AudioControl EPICX12D4: 12 in, dual 4 ohm, 500 W RMS / 750 W max, mounting depth 153.8 mm, ₹23,790
AudioControl EPICXV8: loaded vented subwoofer enclosure, 8 in, 400 W RMS / 600 W max, 1 ohm, ₹34,840
AudioControl EPICXV12: loaded vented subwoofer enclosure, 12 in, 500 W RMS / 750 W max, 1 ohm, ₹46,740
AudioControl SPK-12S4: 12 in, single 4 ohm, 500 W RMS / 700 W max, mounting depth 156 mm, ₹39,940
Price and value in India
At the time of writing (October 2026), VA3 Car Studio lists the EPICX8D4 at ₹16,990, 15% below the MRP of ₹19,990. Remember to budget for an enclosure and a matched amplifier; the driver price is only part of the total. Prices can change, so the product page always shows the current price.
Verdict: who should shortlist the EPICX8D4
The EPICX8D4 is a sensible, well-documented subwoofer for a first proper bass upgrade, with dual voice coils that make amplifier matching easy. If you want a ready-made box, look at the loaded EPICXV enclosures.
Real-world reviews and limitations
We have not yet published a VA3 installation report for the EPICX8D4. The figures in this review are AudioControl's published specifications, not our own measurements, and real-world results depend on the enclosure, the cabin and the tune. If you have used one, we would welcome your feedback.
Frequently asked questions
What enclosure does AudioControl recommend for the EPICX8D4?
Sealed: 0.65 cu ft (18.4 L) internal; 16 x 10.5 x 7.5 in external (W x H x D). Ported: 0.71 cu ft (20.1 L) net, tuned to 40 Hz; 17 x 12 x 10.5 in external; port 0.75 x 10.5 in, 16 in long.
How much power does the EPICX8D4 need?
It is rated at 400 W RMS / 600 W max; an amplifier delivering close to the RMS rating at your final impedance is the usual target.
How should I wire the EPICX8D4?
Wire the two 4-ohm voice coils in parallel for 2 ohm or in series for 8 ohm.
What mounting depth does the EPICX8D4 need?
103.9 mm (4.1 in), with a 181 mm (7.13 in) cut-out.
Comments