SoundQubed HDX4.2 Series 18" Subwoofer 4" DVC 4,000 Watts RMS D1/D2
Key features
- Subwoofer size: 18.0 inches
- RMS power per subwoofer: 4000 W
- Voice-coil options: D1, D2
- Mounting depth (D2): 11.34 in / 288 mm
- Mounting cutout diameter (D2): 16.73 in / 425 mm
- Linear excursion (Xmax, D2): ±23 mm
SoundQubed HDX4.2 Series 18" 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 18" 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 HDX4.2-18, an 18-inch subwoofer rated for 4,000 watts RMS. Its 1,200 cm² cone area and 4-inch dual voice coil are designed for substantial air displacement in high-power builds.
Choose the D1 or D2 version to suit your amplifier’s supported final load. The source recommends ported enclosures for this subwoofer, with sealed-box volume options also listed below.
Key Features & Benefits
- 4,000 W RMS rating: Match amplifier output to the subwoofer’s rating at the final wired load.
- 18-inch cone with 1,200 cm² SD: The large cone area supports high air displacement.
- 4-inch voice coil: The 70 mm coil length is specified for this high-power driver.
- 23 mm Xmax (±): The listed linear excursion helps you assess its movement range.
- D1 and D2 options: Select a coil configuration that works with your amplifier and system wiring.
- Ported and sealed volume guidance: Use the listed enclosure ranges to plan your build.
Technical Specifications
| Specification | HDX4.2-18D1 | HDX4.2-18D2 |
|---|---|---|
| Woofer Size | 18" | 18" |
| 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 | 31.6 Hz | 31.7 Hz |
| Impedance | 1+1 Ohm | 2+2 Ohm |
| QMS | 3.56 | 3.30 |
| QES | 0.52 | 0.55 |
| QTS | 0.45 | 0.47 |
| VAS | 114.0 L | 113.2 L |
| Le | 0.99 mH | 1.65 mH |
| η (No) | 0.67% | 0.63% |
| CMS | 0.06 mm/N | 0.06 mm/N |
| Sensitivity (1W/1M) | 90.3 dB | 90.4 dB |
| BL | 17.8 N/A | 23.3 N/A |
| Xmax (±) | 23 mm | 23 mm |
| Xmech (±) | 47 mm | 47 mm |
| SD | 1,200 cm² | 1,200 cm² |
| Model | A | B | C | D |
|---|---|---|---|---|
| HDX4.2-18D1 | 465 mm / 18.3" | 425 mm / 16.73" | 260 mm / 10.24" | 288 mm / 11.34" |
| HDX4.2-18D2 | 465 mm / 18.3" | 425 mm / 16.73" | 260 mm / 10.24" | 288 mm / 11.34" |
| Enclosure Type | HDX4.2-18 D1/D2 |
|---|---|
| Sealed Enclosure | 3.0–5.75 ft³ |
| Ported Enclosure | 5–7 ft³ |
For ported use, the source recommends tuning to 28–34 Hz.
Why Choose This Product?
The HDX4.2-18 pairs a large cone area with a 402 oz magnet and a 4,000 W RMS rating. Those specifications make it an option for daily or competition-oriented builds designed around a high-power 18-inch subwoofer.
The choice between D1 and D2 affects the final load you can wire from one subwoofer. Check that load against your amplifier’s minimum supported impedance before selecting a version.
Installation & Compatibility Notes
- Single D1 wiring: Parallel wiring produces 0.5Ω; series wiring produces 2Ω.
- Single D2 wiring: Parallel wiring produces 1Ω; series wiring produces 4Ω.
- Amplifier matching: Match power to the 4,000 W RMS rating at the final wired load, and set gain to avoid clipping.
- Load limits: Do not use a 0.5Ω load unless the amplifier is explicitly rated for it. Multiple-subwoofer wiring changes the final load.
- Enclosure planning: Allow for the selected enclosure volume and compare the listed mounting dimensions with your available space.
Frequently Asked Questions
What amplifier power should I use with the HDX4.2-18?
Match amplifier power to the subwoofer’s 4,000 W RMS rating at the final wired impedance. The amplifier must support that load, and gain should be set to avoid clipping.
What final impedance can I wire from one D1 or D2 subwoofer?
A single D1 can be wired to 0.5Ω in parallel or 2Ω in series. A single D2 can be wired to 1Ω in parallel or 4Ω in series. Use only a load supported by your amplifier.
What enclosure size and tuning are recommended?
The listed sealed volume is 3.0–5.75 ft³. The ported volume is 5–7 ft³, with a recommended tuning range of 28–34 Hz.
What are the mounting dimensions?
Both versions list A: 465 mm / 18.3", B: 425 mm / 16.73", C: 260 mm / 10.24", and D: 288 mm / 11.34". Compare these dimensions with your planned installation space.
Is the HDX4.2-18 intended only for competition use?
The product description identifies it for both daily and competition installs. Its 4,000 W RMS rating and enclosure requirements should guide your system planning.
Explore More
Shop SoundQubed products at 12 Volt Outlet. Want to learn more about SoundQubed? Explore our SoundQubed brand profile.
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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.
