SoundQubed HDX4.2 Series 15" Subwoofer 4" DVC 4,000 Watts RMS D1/D2
Key features
- Subwoofer size: 15.0 inches
- RMS power per subwoofer: 4000 W
- Voice-coil options: D1, D2
- Mounting depth (D2): 9.57 in / 243 mm
- Mounting cutout diameter (D2): 13.78 in / 350 mm
- Linear excursion (Xmax, D2): ±23 mm
SoundQubed HDX4.2 Series 15" Subwoofer 4" DVC 4,000 Watts RMS D1/D2 - Dual 2 Ohm is backordered and will ship as soon as it is back in stock.
SoundQubed HDX4.2 Series 15" Subwoofer 4" DVC 4,000 Watts RMS D1/D2 - Dual 2 Ohm is backordered and will ship as soon as it is back in stock.
Description
Description
Product Overview
Build a high-output system around the SoundQubed HDX4.2-15, a 15-inch subwoofer rated for 4,000 W RMS and 8,000 W peak power. Its 4-inch voice coil, 402 oz magnet and 23 mm (±) Xmax make it a substantial driver for daily or competition-oriented builds.
Choose the D1 or D2 voice-coil version to suit your amplifier and system wiring plan. The recommended enclosure ranges cover both sealed and ported builds.
Key Features & Benefits
- High power rating: The 4,000 W RMS and 8,000 W peak ratings help you match the driver to a high-power amplifier.
- Large motor assembly: A 402 oz magnet and BL ratings of 17.1 N/A (D1) and 22.8 N/A (D2) are specified for the two versions.
- 4-inch voice coil: The 70 mm coil length is designed for high-power use.
- Long excursion: Xmax is 23 mm (±), with Xmech listed at 47 mm (±).
- D1 or D2 options: Select the dual 1-ohm or dual 2-ohm version to plan the final amplifier load.
- Two enclosure approaches: Choose a sealed enclosure from 1.88–3.5 ft³ or a ported enclosure from 3–6 ft³.
Technical Specifications
| Specification | HDX4.2-15D1 | HDX4.2-15D2 |
|---|---|---|
| Woofer Size | 15" | 15" |
| RMS Power | 4,000 W | 4,000 W |
| Peak Power | 8,000 W | 8,000 W |
| Magnet Weight | 402 oz | 402 oz |
| Coil Diameter | 4 in | 4 in |
| Coil Length | 70 mm | 70 mm |
| Fs | 33.7 Hz | 33.9 Hz |
| Impedance | 1+1 Ohm | 2+2 Ohm |
| QMS | 3.57 | 3.56 |
| QES | 0.49 | 0.51 |
| QTS | 0.43 | 0.45 |
| VAS | 57.2 L | 56.6 L |
| Le | 1.03 mH | 1.67 mH |
| η (No) | 0.43% | 0.40% |
| CMS | 0.06 mm/N | 0.06 mm/N |
| Sensitivity (1W/1M) | 88.3 dB | 88.5 dB |
| BL | 17.1 N/A | 22.8 N/A |
| Xmax (±) | 23 mm | 23 mm |
| Xmech (±) | 47 mm | 47 mm |
| SD | 805 cm² | 805 cm² |
Mounting Dimensions
| Model | A | B | C | D |
|---|---|---|---|---|
| HDX4.2-15D1 | 390 mm / 15.4" | 350 mm / 13.78" | 260 mm / 10.24" | 243 mm / 9.57" |
| HDX4.2-15D2 | 390 mm / 15.4" | 350 mm / 13.78" | 260 mm / 10.24" | 243 mm / 9.57" |
Enclosure Suggestions
| Enclosure Type | HDX4.2-15 D1/D2 |
|---|---|
| Sealed Enclosure | 1.88–3.5 ft³ |
| Ported Enclosure | 3–6 ft³ |
Why Choose This Product?
The HDX4.2-15 pairs a 15-inch cone with substantial power handling and excursion specifications. Its Fs is 33.7 Hz for D1 and 33.9 Hz for D2, making the enclosure and system design important choices for your intended bass response.
Use the specified enclosure volume ranges to plan a sealed or ported build. The source recommends ported tuning around 30–36 Hz for SPL and low-frequency extension, or a sealed enclosure for tighter bass response.
Installation & Compatibility Notes
Match your amplifier’s RMS output to the subwoofer’s 4,000 W RMS rating at the final wired impedance. Set amplifier gain to avoid clipping, and ensure the electrical supply and wiring support the system.
For one D1 subwoofer, parallel wiring produces 0.5Ω and series wiring produces 2Ω. For one D2 subwoofer, parallel wiring produces 1Ω and series wiring produces 4Ω. Use only a final load supported by your amplifier; do not use a 0.5Ω load unless the amplifier is explicitly rated for it. Multiple-subwoofer wiring changes the final load.
Check the listed mounting dimensions against your available installation space before building or purchasing an enclosure.
Frequently Asked Questions
What amplifier power should I match with the SoundQubed HDX4.2-15?
Its rating is 4,000 W RMS. Match amplifier output to that rating at the final wired load, and confirm the amplifier supports that impedance.
What final impedance can I wire with the D1 and D2 versions?
One D1 can be wired to 0.5Ω in parallel or 2Ω in series. One D2 can be wired to 1Ω in parallel or 4Ω in series.
What enclosure volume is recommended?
The listed range is 1.88–3.5 ft³ for sealed enclosures and 3–6 ft³ for ported enclosures. The source recommends 30–36 Hz tuning for a ported build.
How do I choose between D1 and D2?
Choose the voice-coil version that allows your amplifier to operate at a supported final impedance. Account for the number of subwoofers when calculating the system load.
Will the subwoofer fit my enclosure?
Compare the mounting dimensions in the specification table with your available space and enclosure design before installation.
Explore More
Shop at 12 Volt Outlet for the SoundQubed HDX4.2-15. Want to learn more about SoundQubed? Explore our SoundQubed brand profile.
Recommended Monoblock Amplifiers
Power-matched options for one subwoofer or one complete loaded enclosure. We aim to include same-brand choices when their ratings qualify.
Loading amplifier suggestions…
Suggestions use 75–125% of the subwoofer’s RMS rating at the wiring load shown. Check wiring, enclosure needs, electrical capacity and installation space. Set gain and filters correctly to avoid overpowering the subwoofer. Buying more than one subwoofer changes the match.
