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AudioControl EPICX12D4 Review: Specifications, Fitment and Comparisons

Writer: Akansh Garg
Akansh Garg
3 days ago
5 min read

Quick summary: the buying decision

The EPICX12D4 is a 12-inch EPICX Series subwoofer with dual 4-ohm voice coils, rated at 500 W RMS / 750 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 153.8 mm (6 in), so check the space behind the baffle before you commit.

AudioControl EPICX12D4: what it is

The AudioControl EPICX12D4 is a 12-inch (300 mm) EPICX Series subwoofer with dual 4-ohm voice coils, rated at 500 W RMS and 750 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.

Official AudioControl EPICX12D4 product photograph

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 EPICX12D4 is rated at 500 W RMS / 750 W max with dual 4 ohm voice coils (2.38 in diameter). AudioControl quotes a free-air resonance (Fs) of 30.1 Hz and an efficiency of 86.6 dB; the cone is non-pressed paper and the magnet measures 156 x 75 x 25 mm (6.14 x 2.95 x 0.98 in).

Fitment: overall diameter 316 mm (12.4 in), cut-out 281 mm (11.06 in), mounting depth 153.8 mm (6 in) and mounting height 24 mm (1 in).

Full specifications as published by AudioControl:

  • Model: EPICX12D4

  • Type: 12 in dual voice coil subwoofer driver

  • Size: 12 in (300 mm)

  • Voice coils: Dual 4 ohm, 2.38 in

  • Power handling: 500 W RMS / 750 W max

  • Resonance frequency (Fs): 30.1 Hz

  • Efficiency: 86.6 dB

  • Cone: Non-pressed paper

  • Magnet: 156 x 75 x 25 mm (6.14 x 2.95 x 0.98 in)

  • Overall diameter: 316 mm (12.4 in)

  • Cut-out diameter: 281 mm (11.06 in)

  • Mounting depth: 153.8 mm (6 in)

  • Mounting height: 24 mm (1 in)

  • Motor diameter (with cover): 162 mm (6.4 in)

  • Sealed enclosure: 1.25 cu ft internal; 19 x 14.5 x 11 in external (W x H x D)

  • Ported enclosure: 2 cu ft net, tuned to 33 Hz; 23.75 x 16.5 x 12.5 in external; port 1.2 x 15 in, 23.75 in long

  • In the box: EPICX12D4 subwoofer, user guide

Enclosure: what AudioControl recommends

AudioControl's recommendations for the EPICX12D4:

  • Sealed: 1.25 cu ft (35.4 L) internal; 19 x 14.5 x 11 in external (W x H x D)

  • Ported: 2 cu ft (56.6 L) net, tuned to 33 Hz; 23.75 x 16.5 x 12.5 in external; port 1.2 x 15 in, 23.75 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 delivers 500 W RMS, a close match for one EPICX12D4. For two subwoofers wired to 1 ohm, the EPIC1000 delivers 1,000 W at 1 ohm, about 500 W each.

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.

AudioControl EPICX12D4, alternate view

How it compares

Related AudioControl subwoofers at VA3 Car Studio:

Price and value in India

At the time of writing (October 2026), VA3 Car Studio lists the EPICX12D4 at ₹23,790, 15% below the MRP of ₹27,990. 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 EPICX12D4

The EPICX12D4 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 EPICX12D4. 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 EPICX12D4?

Sealed: 1.25 cu ft (35.4 L) internal; 19 x 14.5 x 11 in external (W x H x D). Ported: 2 cu ft (56.6 L) net, tuned to 33 Hz; 23.75 x 16.5 x 12.5 in external; port 1.2 x 15 in, 23.75 in long.

How much power does the EPICX12D4 need?

It is rated at 500 W RMS / 750 W max; an amplifier delivering close to the RMS rating at your final impedance is the usual target.

How should I wire the EPICX12D4?

Wire the two 4-ohm voice coils in parallel for 2 ohm or in series for 8 ohm.

What mounting depth does the EPICX12D4 need?

153.8 mm (6 in), with a 281 mm (11.06 in) cut-out.

Sources, pricing and related reading

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