Soundqubed HDX3.2 Series 18" Subwoofer 3" DVC 2,500 Watts RMS D2/D1
Soundqubed HDX3.2 Series 18" Subwoofer 3" DVC 2,500 Watts RMS D2/D1 - Dual 1 Ohm is backordered and will ship as soon as it is back in stock.
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Soundqubed HDX3.2 Series 18" Subwoofer 3" DVC 2,500 Watts...
Description
Description
SoundQubed HDX3.2-18 — 2,500W RMS Competition-Grade 18" Subwoofer
The SoundQubed HDX3.2 Series 18" subwoofer is the largest and most powerful driver in the HDX3.2 lineup — a full-size, competition-ready 18-inch subwoofer built for builders who want maximum cone area, infrasonic bass extension, and the kind of low-end output that physically moves air and people. Rated at 2,500 watts RMS and 5,000 watts peak, the HDX3.2-18 is powered by a 300 oz magnet, a 3-inch diameter voice coil with a 50mm coil length, and a motor assembly engineered for extreme linear excursion across a massive 1,200 cm² cone area. Available in Dual 1 Ohm (D1) and Dual 2 Ohm (D2) configurations, this sub is built for wall builds, trunk builds, and any application where maximum displacement and infrasonic output are the goal.
With an Xmax of 15mm (±) and Xmech of 35mm (±), the HDX3.2-18 delivers controlled linear excursion across its enormous cone area, producing authoritative sub-bass extension down to a free-air resonance (Fs) of 29.3 Hz (D2) / 31.6 Hz (D1). With sensitivity ratings of 89.6–89.7 dB, this is the most efficient driver in the HDX3.2 lineup — capable of producing serious SPL output even on moderate amplifier power, and absolutely devastating when fed its full 2,500W RMS rating.
Why Choose the SoundQubed HDX3.2-18?
- 2,500W RMS / 5,000W Peak Power: Handles extreme amplifier output without flinching — built for high-power mono block amplifiers in daily and competition installs.
- 300 oz Magnet Assembly: Massive motor force delivers exceptional BL (16.4 N/A D1 / 28.5 N/A D2) for precise, controlled cone movement at high excursion levels.
- 3" Voice Coil, 50mm Coil Length: Extended coil length maximizes gap interaction for superior thermal management and sustained high-power performance.
- 1,200 cm² Cone Area (SD): The largest cone in the HDX3.2 lineup — maximum air displacement for the deepest, most physical sub-bass output.
- 15mm Xmax / 35mm Xmech: Exceptional linear and mechanical excursion — deep, authoritative bass without bottoming out.
- Dual 1 Ohm & Dual 2 Ohm Available: Wire D1 to 0.5Ω or 2Ω, wire D2 to 1Ω or 4Ω — maximum flexibility for any amplifier's stable impedance load.
- Ported Enclosure Optimized: Recommended ported volume 5–7 ft³ — built to breathe and move in a large, properly tuned vented box.
- 89.6–89.7 dB Sensitivity: The most efficient driver in the HDX3.2 lineup — gets devastatingly loud without demanding every last watt from your amplifier.
Amplifier & Enclosure Recommendations
The HDX3.2-18 is designed to be paired with a high-output mono block amplifier capable of delivering 2,500W RMS or more at the wired impedance load. For the D1 (Dual 1 Ohm) variant, wire the coils in parallel for a 0.5Ω final load or in series for 2Ω. For the D2 (Dual 2 Ohm) variant, wire in parallel for 1Ω or in series for 4Ω. Most high-power Class D mono amps are stable at 1Ω, making the D2 the most common choice for single-sub builds.
For enclosures, a ported box tuned to 28–34 Hz in the 5–7 ft³ range will maximize SPL output and infrasonic bass extension. The HDX3.2-18 is optimized for ported loading — its large cone area and long-throw suspension need room to breathe. A sealed enclosure in the 4.0–6.5 ft³ range can work for tighter, more controlled bass in applications where ported isn't practical.
Electro Acoustic Specifications & Thiele Small Parameters
| Specification | HDX3.2-18D1 | HDX3.2-18D2 |
|---|---|---|
| Woofer Size | 18" | 18" |
| RMS Power | 2,500 W | 2,500 W |
| Peak Power | 5,000 W | 5,000 W |
| Magnet Weight | 300 oz | 300 oz |
| Coil Diameter | 3 in | 3 in |
| Coil Length | 50 mm | 50 mm |
| Fs | 31.6 Hz | 29.3 Hz |
| Impedance | 1+1 Ohm | 2+2 Ohm |
| QMS | 5.88 | 5.52 |
| QES | 0.61 | 0.74 |
| QTS | 0.55 | 0.43 |
| VAS | 112.1 L | 112.9 L |
| Le | 1.02 mH | 2.92 mH |
| η (No) | 0.57% | 0.59% |
| CMS | 0.06 mm/N | 0.06 mm/N |
| Sensitivity (1W/1M) | 89.6 dB | 89.7 dB |
| BL | 16.4 N/A | 28.5 N/A |
| Xmax (±) | 15 mm | 15 mm |
| Xmech (±) | 35 mm | 35 mm |
| SD | 1,200 cm² | 1,200 cm² |
Mounting Dimensions
| Model | A | B | C | D |
|---|---|---|---|---|
| HDX3.2-18D1 | 465 mm / 18.3" | 425 mm / 16.73" | 228 mm / 8.98" | 280 mm / 11.02" |
| HDX3.2-18D2 | 465 mm / 18.3" | 425 mm / 16.73" | 228 mm / 8.98" | 280 mm / 11.02" |
Enclosure Suggestions
| Enclosure Type | HDX3.2-18 D1/D2 |
|---|---|
| Sealed Enclosure | 4.0–6.5 ft³ |
| Ported Enclosure | 5–7 ft³ |
Frequently Asked Questions
What amplifier do I need for the SoundQubed HDX3.2-18?
You need a mono block amplifier rated at 2,500W RMS or more at your wired impedance. The D2 wired to 1Ω or the D1 wired to 2Ω are the most common pairings. Look for a high-current Class D mono amp stable at 1Ω for best results.
Should I choose the D1 or D2 version?
Choose D2 (Dual 2 Ohm) if your amplifier is stable at 1Ω (parallel) or 4Ω (series) — this is the most common configuration. Choose D1 (Dual 1 Ohm) if your amp is stable at 0.5Ω (parallel) or you need a 2Ω final load (series).
What size box does the HDX3.2-18 need?
For ported, use 5–7 ft³ tuned to approximately 28–34 Hz for maximum SPL and infrasonic bass extension. A sealed box in the 4.0–6.5 ft³ range works for tighter, more controlled bass where ported isn't practical.
Can this subwoofer handle daily use or is it competition-only?
The HDX3.2-18 is built for both. Its 89.6–89.7 dB sensitivity — the highest in the HDX3.2 lineup — means it gets devastatingly loud even on moderate power, while its 2,500W RMS rating and 300 oz motor make it a serious competition contender.
