PRORECK 408 D4 8 Inch Car Subwoofer
Dual 4 Ohm Car Audio Subwoofer | 400W RMS | 1200W Peak | 12.5mm Xmax
The PRORECK 408 D4 is an 8 inch car subwoofer designed for compact car audio systems that need clean, controlled bass and flexible amplifier matching. This car audio subwoofer features a dual 4 ohm voice coil design, handles 400 watts RMS and 1200 watts peak, and supports both sealed and ported enclosure applications.
If you are searching for car subwoofers, a subwoofer for car daily-driving systems, or an 8 inch car subwoofer for a compact trunk or custom enclosure build, the 408 D4 delivers practical installation dimensions, stable impedance options, and solid low-frequency performance.
Important: this model is a passive dual voice coil subwoofer, not a powered subwoofer. Enclosure not included. An external amplifier is required.
Key Features
- 400W RMS / 1200W Peak Power Handling for strong bass output in daily-driver and custom car audio systems.
- Dual 4 Ohm Voice Coil Design provides flexible wiring options for amplifier matching and custom system loads.
- 12.5mm Xmax supports solid low-frequency excursion and controlled bass response.
- 8 Inch Compact Format fits space-conscious installs while still delivering real low-end performance.
- Works in Sealed or Ported Boxes so you can tune for tighter response or stronger low-frequency output.
- Built for Car Audio Use with a thickened carbon steel frame, double stack ferrite magnet structure, and multi-hole ventilation/cooling design.
Why Choose the PRORECK 408 D4
The PRORECK 408 D4 is a practical choice for buyers who want an 8 inch car subwoofer that fits more vehicles and compact enclosure layouts than larger models. Its dual 4 ohm voice coil configuration gives more wiring flexibility for systems that need a different final load than a D2 setup.
For shoppers comparing car subwoofers for compact car audio builds, the 408 D4 is especially useful for smaller sealed boxes, custom trunk enclosures, and daily-driver bass upgrades where clean response and practical packaging matter.
Product Specifications
| Brand |
PRORECK |
| Model |
408 D4 |
| Type |
Passive Dual Voice Coil Car Subwoofer |
| Speaker Size |
8 Inch |
| Rated Impedance |
Dual 4 Ohm |
| DC Resistance (Re) |
D4 / 3.6Ω |
| RMS Power Handling |
400W |
| Peak Power Handling |
1200W |
| Frequency Response |
65Hz–800Hz |
| Fs |
65Hz |
| Sensitivity (1w/1m) |
83dB |
| Qts |
0.62 |
| Qms |
5.79 |
| Qes |
0.7 |
| Vas |
2.97L |
| Xmax (Linear Excursion) |
12.5mm |
Physical Dimensions
| Outer Frame Dimension |
8.5 in / 216 mm |
| Mounting Cutout |
7.79 in / 197.8 mm |
| Mounting Depth |
4.19 in / 106.4 mm |
| Pore Diameter |
7.08 in / 180 mm |
| Trim Ring Height |
1 in / 25.4 mm |
Recommended Box Specifications
Sealed Enclosure
Minimum Sealed Box Volume: 0.43 ft³ (12.3L)
Maximum Sealed Box Volume: 0.79 ft³ (22.4L)
Minimum Sealed Box Panel Dimensions
using 3/4" MDF
Panel A: 10.5 x 10.5 in
Panel B: 10.5 x 11.8 in
Panel C: 10.5 x 11.8 in
Ported / Vented Enclosure
Minimum Vented Box Volume: 1.16 ft³ (33L)
Maximum Vented Box Volume: 1.60 ft³ (45.5L)
Minimum Port Opening: 1.96 x 5.5 in
Minimum Port Length: 5.5 in
Box Building Notes
- Enclosure not included. Box specifications are provided for custom enclosure builds only.
- Use 3/4" (1.9 cm) or thicker MDF and seal all joints with silicone.
- Add internal bracing to larger unsupported panels for improved enclosure strength.
- Choose a sealed box for tighter, more controlled bass response.
- Choose a vented box for stronger low-frequency output and higher bass efficiency.
Construction Highlights
- Thickened carbon steel frame
- Protective PVC textured magnet cover
- Double stack ferrite magnet structure
- High-temperature resistant coil aluminum frame
- Optimized motor magnetics with extended pole and bumped backplate
- Multi-hole ventilation/cooling technology
- Dual tear & fatigue resistant poly-cotton spiders
- Multi-point high-temp/high-strength neck joint bonding technique
- Pure copper chrome-plated/isolated compression input terminal assembly
Installation & System Matching
The PRORECK 408 D4 is best used with an external mono or bridged amplifier matched to a dual 4 ohm subwoofer setup. Because it is a DVC model, it offers multiple wiring options depending on your amplifier’s safe load range.
For optimum subwoofer performance, an active 80–100Hz low-pass crossover at 12dB/octave is recommended.
What’s Included
- 1 × PRORECK 408 D4 8" Car Subwoofer
- Enclosure not included
FAQ
Is the PRORECK 408 D4 a powered subwoofer?
No. This is a passive car audio subwoofer and requires an external amplifier.
What size is the PRORECK 408 D4?
It is an 8 inch car subwoofer.
What impedance is the 408 D4?
The 408 D4 is the dual 4 ohm version, with Re listed as 3.6Ω for the D4 model.
Does it include a box or enclosure?
No. This product includes the subwoofer speaker only. Enclosure not included.
Can I use it in a sealed or ported box?
Yes. The 408 D4 has recommended specifications for both sealed and ported enclosures.
Is this a good subwoofer for daily-driver car audio systems?
Yes. Its compact 8 inch size, 400W RMS handling, and flexible enclosure support make it suitable for everyday car audio upgrades and custom compact installs.
