{"product_id":"stereo-integrity-hst-18-subwoofer","title":"Stereo Integrity HST-18 | 18 Inch Subwoofer","description":"\u003cstyle\u003e\n.si-desc{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#1e293b;max-width:1200px;margin:0 auto;background:#ffffff}\n.si-hero{background:linear-gradient(135deg,#0b0b0c 0%,#2d3139 100%);padding:52px 36px;text-align:center;color:#ffffff}\n.si-hero .si-brand{font-size:.85em;letter-spacing:.3em;text-transform:uppercase;color:#cbd5e1;margin:0 0 10px 0}\n.si-hero .si-title{font-size:2.4em;font-weight:800;letter-spacing:1px;margin:0 0 8px 0;color:#ffffff}\n.si-hero .si-subtitle{font-size:1.15em;font-weight:300;color:#e2e8f0;margin:0 0 22px 0}\n.si-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:10px}\n.si-badge{background:rgba(255,255,255,.08);border:1px solid #9ca3af;color:#f8fafc;padding:7px 18px;border-radius:20px;font-size:.88em;font-weight:600}\n.si-section{padding:44px 36px;border-bottom:1px solid #e2e8f0;background:#ffffff}\n.si-section.si-alt{background:#f5f6f8}\n.si-section h2{color:#111827;font-size:1.8em;font-weight:700;margin:0 0 18px 0;padding-bottom:10px;border-bottom:3px solid #B91C1C}\n.si-section p{font-size:1.04em;color:#334155;margin:0 0 15px 0}\n.si-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:22px 0}\n.si-card{background:#ffffff;border:1px solid #e2e8f0;border-top:4px solid #B91C1C;border-radius:8px;padding:20px}\n.si-card h3{color:#111827;font-size:1.08em;font-weight:700;margin:0 0 8px 0}\n.si-card p{font-size:.97em;color:#475569;margin:0}\n.si-note{background:#f5f6f8;border-left:5px solid #B91C1C;padding:18px 22px;margin:22px 0;border-radius:0 8px 8px 0}\n.si-note p{margin:0;color:#334155}\n.si-link{display:inline-block;background:#B91C1C;color:#ffffff;text-decoration:none;font-weight:700;padding:12px 24px;border-radius:8px;margin:6px 0}\n.si-cta{background:linear-gradient(135deg,#0b0b0c 0%,#2d3139 100%);padding:44px 36px;text-align:center;color:#ffffff}\n.si-cta h2{color:#ffffff;font-size:1.6em;margin:0 0 12px 0}\n.si-cta p{color:#e5e7eb;font-size:1.04em;margin:0 0 8px 0}\n@media (max-width:600px){.si-grid{grid-template-columns:1fr}.si-hero,.si-section,.si-cta{padding:34px 18px}.si-hero .si-title{font-size:1.8em}}\n\u003c\/style\u003e\n\u003cdiv class=\"si-desc\"\u003e\n\u003cdiv class=\"si-hero\"\u003e\n\u003cp class=\"si-brand\"\u003eStereo Integrity\u003c\/p\u003e\n\u003cp class=\"si-title\"\u003eHST-18\u003c\/p\u003e\n\u003cp class=\"si-subtitle\"\u003e18 Inch High-Excursion Subwoofer | Sold Individually\u003c\/p\u003e\n\u003cdiv class=\"si-badges\"\u003e\n\u003cspan class=\"si-badge\"\u003e40 mm One-Way Linear Travel\u003c\/span\u003e \u003cspan class=\"si-badge\"\u003e102 mm Peak Excursion\u003c\/span\u003e \u003cspan class=\"si-badge\"\u003eTriple Stacked 250 mm Motor\u003c\/span\u003e \u003cspan class=\"si-badge\"\u003eCarbon Fiber Cone\u003c\/span\u003e \u003cspan class=\"si-badge\"\u003eDual 1 or Dual 2 Ohm\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"si-section\"\u003e\n\u003ch2\u003eMassive Bass From a Small Enclosure\u003c\/h2\u003e\n\u003cp\u003eThe HST series is Stereo Integrity's answer to a common problem: getting very large amounts of bass out of a very small enclosure. The HST-18 does it with long stroke and high motor force. Its bifilar copper voice coil is capable of 40 mm of one-way linear travel, which works out to 80 mm of total linear travel and 102 mm of total peak excursion.\u003c\/p\u003e\n\u003cp\u003eStereo Integrity hand-builds its HST subwoofers in North Carolina.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"si-section si-alt\"\u003e\n\u003ch2\u003eEngineering Highlights\u003c\/h2\u003e\n\u003cdiv class=\"si-grid\"\u003e\n\u003cdiv class=\"si-card\"\u003e\n\u003ch3\u003eTriple Stacked Motor\u003c\/h3\u003e\n\u003cp\u003eA large 250 mm triple stacked motor structure with three shorting rings supplies the force needed to control a long-throw 18 inch cone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"si-card\"\u003e\n\u003ch3\u003eBifilar Copper Voice Coil\u003c\/h3\u003e\n\u003cp\u003eThe bifilar copper coil is capable of 40 mm of one-way linear travel, and the shorting rings in the motor work to hold inductance down across that stroke.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"si-card\"\u003e\n\u003ch3\u003eLinear Suspension\u003c\/h3\u003e\n\u003cp\u003eA wide soft foam surround and a three layer, 10 inch natural Nomex spider keep compliance flat and linear. Sewn-on flat voice coil leads eliminate lead tap.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"si-card\"\u003e\n\u003ch3\u003eCarbon Fiber Sandwich Cone\u003c\/h3\u003e\n\u003cp\u003eA carbon fiber sandwich cone and dust cap provide very high cone stiffness, carried by a high-clearance cast aluminum frame with large 4 AWG push terminals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"si-section\"\u003e\n\u003ch2\u003eChoosing Your Version\u003c\/h2\u003e\n\u003cp\u003eThe HST-18 is offered in dual 1 ohm and dual 2 ohm. Dual 1 ohm coils wire to 0.5 ohm in parallel or 2 ohms in series, and dual 2 ohm coils wire to 1 ohm in parallel or 4 ohms in series.\u003c\/p\u003e\n\u003cdiv class=\"si-note\"\u003e\u003cp\u003e\u003cstrong\u003ePlanning note:\u003c\/strong\u003e Stereo Integrity's product page does not list a Thiele-Small parameter set, power rating, or mounting dimensions for the HST-18. Call us before you plan an enclosure and we will help you work through the details.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"si-section si-alt\"\u003e\n\u003ch2\u003eOrdering\u003c\/h2\u003e\n\u003cp\u003eEach HST-18 is hand-built to order and ships separately. Stereo Integrity lists a 90 pound shipping weight, so call 931-563-5151 before you order for current lead time and delivery options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"si-cta\"\u003e\n\u003ch2\u003eAuthorized Stereo Integrity Dealer\u003c\/h2\u003e\n\u003cp\u003eAudio Intensity is an authorized Stereo Integrity dealer, and we build enclosures around their drivers.\u003c\/p\u003e\n\u003cp\u003eCall 931-563-5151 to plan an HST-18 build.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Stereo Integrity","offers":[{"title":"Dual 1 Ohm","offer_id":44924064170073,"sku":"SI-HST18-D1","price":1399.99,"currency_code":"USD","in_stock":false},{"title":"Dual 2 Ohm","offer_id":44924064202841,"sku":"SI-HST18-D2","price":1399.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/stereo-integrity-hst-18-front.jpg?v=1789576560","url":"https:\/\/audiointensity.com\/products\/stereo-integrity-hst-18-subwoofer","provider":"Audio Intensity","version":"1.0","type":"link"}