{"product_id":"soundqubed-hdx4-2-series-15-subwoofer-4-dvc-4-000-watts-rms-d2-d4","title":"Soundqubed HDX4.2 Series 15\" Subwoofer 4\" DVC 4,000 Watts RMS D2\/D4","description":"\u003ch2\u003e\u003cstrong\u003eSoundQubed HDX4.2-15 — 4,000W RMS Competition-Grade 15\" Subwoofer\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eSoundQubed HDX4.2 Series 15\" subwoofer\u003c\/strong\u003e is a professional-grade, high-output 15-inch driver built for SPL competitors and serious builders who demand maximum cone area, infrasonic bass extension, and uncompromising thermal endurance. Rated at \u003cstrong\u003e4,000 watts RMS and 8,000 watts peak\u003c\/strong\u003e, the HDX4.2-15 is powered by a \u003cstrong\u003e402 oz magnet\u003c\/strong\u003e, a \u003cstrong\u003e4-inch diameter voice coil\u003c\/strong\u003e with a 70mm coil length, and a motor assembly engineered for extreme linear excursion. Available in \u003cstrong\u003eDual 2 Ohm (D2)\u003c\/strong\u003e and \u003cstrong\u003eDual 4 Ohm (D4)\u003c\/strong\u003e configurations, this sub wires cleanly into virtually any high-power mono block amplifier setup.\u003c\/p\u003e\n\n\u003cp\u003eWith an \u003cstrong\u003eXmax of 23mm (±)\u003c\/strong\u003e and \u003cstrong\u003eXmech of 47mm (±)\u003c\/strong\u003e, the HDX4.2-15 delivers massive linear cone travel across its \u003cstrong\u003e805 cm² cone area (SD)\u003c\/strong\u003e, producing authoritative sub-bass extension down to a \u003cstrong\u003efree-air resonance (Fs) of 33.7 Hz (D2) \/ 33.9 Hz (D4)\u003c\/strong\u003e. With sensitivity ratings of \u003cstrong\u003e88.3–88.5 dB\u003c\/strong\u003e, this is a highly efficient driver that gets devastatingly loud even on moderate amplifier power — and absolutely punishing when fed its full 4,000W RMS rating.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Choose the SoundQubed HDX4.2-15?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4,000W RMS \/ 8,000W Peak Power:\u003c\/strong\u003e Handles extreme amplifier output without flinching — built for high-power mono block amplifiers in daily and competition installs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e402 oz Magnet Assembly:\u003c\/strong\u003e Massive motor force delivers exceptional BL (17.1 N\/A D2 \/ 22.8 N\/A D4) for precise, controlled cone movement at high excursion levels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4\" Voice Coil, 70mm Coil Length:\u003c\/strong\u003e Extended coil length maximizes gap interaction for superior thermal management and sustained high-power performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e23mm Xmax \/ 47mm Xmech:\u003c\/strong\u003e Exceptional linear and mechanical excursion — deep, authoritative bass without bottoming out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual 2 Ohm \u0026amp; Dual 4 Ohm Available:\u003c\/strong\u003e Wire D2 to 1Ω or 4Ω, wire D4 to 2Ω or 8Ω — maximum flexibility for any amplifier's stable impedance load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFs of 33.7–33.9 Hz:\u003c\/strong\u003e Tuned for deep sub-bass reproduction — ideal for ported enclosures targeting 30–36 Hz tuning frequencies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePorted Enclosure Optimized:\u003c\/strong\u003e Recommended ported volume 3–6 ft³ and sealed 1.88–3.5 ft³ — versatile for any build style.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e88.3–88.5 dB Sensitivity:\u003c\/strong\u003e Highly efficient — gets seriously loud without demanding every last watt from your amplifier.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAmplifier \u0026amp; Enclosure Recommendations\u003c\/h2\u003e\n\u003cp\u003eThe HDX4.2-15 is designed to be paired with a high-output \u003cstrong\u003emono block amplifier\u003c\/strong\u003e capable of delivering 4,000W RMS or more at the wired impedance load. For the \u003cstrong\u003eD2 (Dual 2 Ohm)\u003c\/strong\u003e variant, wire the coils in parallel for a \u003cstrong\u003e1Ω final load\u003c\/strong\u003e or in series for \u003cstrong\u003e4Ω\u003c\/strong\u003e. For the \u003cstrong\u003eD4 (Dual 4 Ohm)\u003c\/strong\u003e variant, wire in parallel for \u003cstrong\u003e2Ω\u003c\/strong\u003e or in series for \u003cstrong\u003e8Ω\u003c\/strong\u003e. Most high-power Class D mono amps are stable at 1Ω, making the D2 the most common choice for single-sub builds.\u003c\/p\u003e\n\u003cp\u003eFor enclosures, a \u003cstrong\u003eported box tuned to 30–36 Hz\u003c\/strong\u003e in the \u003cstrong\u003e3–6 ft³ range\u003c\/strong\u003e will maximize SPL output and low-frequency extension. For tighter, more accurate SQL bass, a \u003cstrong\u003esealed box in the 1.88–3.5 ft³ range\u003c\/strong\u003e provides excellent transient response and cone control.\u003c\/p\u003e\n\n\u003ch2\u003eElectro Acoustic Specifications \u0026amp; Thiele Small Parameters\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#222;color:#fff;\"\u003e\n\u003cth style=\"padding:8px;border:1px solid #ccc;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003eHDX4.2-15D2\u003c\/th\u003e\n\u003cth style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003eHDX4.2-15D4\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eWoofer Size\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e15\"\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e15\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eRMS Power\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e4,000 W\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e4,000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003ePeak Power\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e8,000 W\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e8,000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eMagnet Weight\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e402 oz\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e402 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eCoil Diameter\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e4 in\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eCoil Length\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e70 mm\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e70 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eFs\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e33.7 Hz\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e33.9 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eImpedance\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e2+2 Ohm\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e4+4 Ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eQMS\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e3.57\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e3.56\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eQES\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e0.49\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e0.51\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eQTS\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e0.43\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e0.45\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eVAS\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e57.2 L\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e56.6 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eLe\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e1.03 mH\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e1.67 mH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eη (No)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e0.43%\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e0.40%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eCMS\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e0.06 mm\/N\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e0.06 mm\/N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eSensitivity (1W\/1M)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e88.3 dB\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e88.5 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eBL\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e17.1 N\/A\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e22.8 N\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eXmax (±)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e23 mm\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e23 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eXmech (±)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e47 mm\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e47 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eSD\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e805 cm²\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e805 cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eMounting Dimensions\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#222;color:#fff;\"\u003e\n\u003cth style=\"padding:8px;border:1px solid #ccc;text-align:left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003eA\u003c\/th\u003e\n\u003cth style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003eB\u003c\/th\u003e\n\u003cth style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003eC\u003c\/th\u003e\n\u003cth style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003eD\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eHDX4.2-15D2\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e390 mm \/ 15.4\"\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e350 mm \/ 13.78\"\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e260 mm \/ 10.24\"\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e243 mm \/ 9.57\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eHDX4.2-15D4\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e390 mm \/ 15.4\"\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e350 mm \/ 13.78\"\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e260 mm \/ 10.24\"\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e243 mm \/ 9.57\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEnclosure Suggestions\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#222;color:#fff;\"\u003e\n\u003cth style=\"padding:8px;border:1px solid #ccc;text-align:left;\"\u003eEnclosure Type\u003c\/th\u003e\n\u003cth style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003eHDX4.2-15 D2\/D4\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eSealed Enclosure\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e1.88–3.5 ft³\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003ePorted Enclosure\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ccc;text-align:center;\"\u003e3–6 ft³\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat amplifier do I need for the SoundQubed HDX4.2-15?\u003c\/strong\u003e\u003cbr\u003eYou need a mono block amplifier rated at \u003cstrong\u003e4,000W RMS or more\u003c\/strong\u003e at your wired impedance. The D2 wired to 1Ω is the most common pairing. Look for a high-current Class D mono amp stable at 1Ω for best results.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I choose the D2 or D4 version?\u003c\/strong\u003e\u003cbr\u003eChoose \u003cstrong\u003eD2 (Dual 2 Ohm)\u003c\/strong\u003e if your amplifier is stable at 1Ω (parallel) or 4Ω (series) — this is the most common configuration. Choose \u003cstrong\u003eD4 (Dual 4 Ohm)\u003c\/strong\u003e if your amp is stable at 2Ω (parallel) or you need an 8Ω final load (series).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size box does the HDX4.2-15 need?\u003c\/strong\u003e\u003cbr\u003eFor \u003cstrong\u003eported\u003c\/strong\u003e, use \u003cstrong\u003e3–6 ft³\u003c\/strong\u003e tuned to approximately 30–36 Hz for maximum SPL and deep bass extension. For \u003cstrong\u003esealed\u003c\/strong\u003e, use \u003cstrong\u003e1.88–3.5 ft³\u003c\/strong\u003e for tight, accurate bass.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this subwoofer handle daily use or is it competition-only?\u003c\/strong\u003e\u003cbr\u003eThe HDX4.2-15 is built for both. Its 88.3–88.5 dB sensitivity means it gets devastatingly loud efficiently, while its 4,000W RMS rating and 402 oz motor make it a serious SPL and SQL competition contender.\u003c\/p\u003e","brand":"SoundQubed","offers":[{"title":"Dual 2 Ohm","offer_id":46117188436012,"sku":null,"price":849.95,"currency_code":"USD","in_stock":true},{"title":"Dual 4 Ohm","offer_id":46117188468780,"sku":null,"price":849.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0656\/8964\/9196\/files\/SoundqubedHDX4.215inSubwooferTrinityCarAudio.png?v=1789003834","url":"https:\/\/www.4staraudio.com\/products\/soundqubed-hdx4-2-series-15-subwoofer-4-dvc-4-000-watts-rms-d2-d4","provider":"4StarAudio","version":"1.0","type":"link"}