{"product_id":"in-phase-car-audio-xtb-828r-underseat-subwoofer","title":"In Phase XTB-828R Underseat Subwoofer | 8\" Passive Radiator | 400W Class D Amp | Sealed | Active Bass","description":"\u003cp class=\"_p_13sb5_107\"\u003e \u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e \u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e\u003cspan\u003eExperience bass accuracy that standard active subwoofers simply can't match — the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eIn Phase Car Audio XTB-828R Underseat Subwoofer\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e combines an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e8-inch glass fibre woven cone driver\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003epassive radiator sealed enclosure technology\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, and a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ebuilt-in 400W Class D amplifier\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e in a compact four-in-one underseat design that delivers deep, controlled, audiophile-grade bass without sacrificing boot space.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e \u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e\u003cstrong\u003e\u003cspan\u003ePassive Radiator Sealed Enclosure — True Bass Accuracy.\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Unlike conventional active subwoofers, the XTB-828R uses \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003epassive radiator technology in a sealed enclosure\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e — a combination that produces exceptionally deep, accurate, and controlled low frequencies with minimal distortion. The result is bass that you feel as much as hear, with the precision and definition that serious car audio enthusiasts demand.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e \u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e\u003cstrong\u003e\u003cspan\u003e8-Inch All-Weather Glass Fibre Woven Cone:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e20cm (8\") glass fibre woven cone drive unit\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is built for durability and performance — the all-weather construction handles temperature variations and humidity without degradation, while the woven cone material delivers the stiffness and lightness needed for accurate, responsive bass reproduction.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e \u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e\u003cstrong\u003e\u003cspan\u003eBuilt-In 400W Class D Amplifier:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The integrated \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e400W Class D amplifier\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e provides high power handling with exceptional efficiency — delivering serious output while generating minimal heat, making it ideal for the confined space of an underseat installation. Multiple onboard controls allow precise tuning to your vehicle and audio preferences.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e \u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e\u003cstrong\u003e\u003cspan\u003eHigh \u0026amp; Low Level Inputs — OEM \u0026amp; Aftermarket Compatible\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHigh and low level inputs\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ensure compatibility with both \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eaftermarket head units\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eOEM factory head units\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e — no need to replace your existing stereo to enjoy upgraded bass performance. Simply connect and tune.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e \u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e\u003cstrong\u003e\u003cspan\u003eFour-in-One Compact Design — Underseat Fitment.\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The clever \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003efour-in-one enclosure design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e integrates the driver, passive radiator, sealed enclosure, and amplifier into a single compact unit sized specifically for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eunderseat installation\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e — maximising bass output while minimising the footprint in your vehicle.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e \u003c\/p\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e\u003cstrong\u003e\u003cspan\u003eComplete Wiring Kit Included:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Comes complete with a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ewiring kit\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for straightforward installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cblockquote class=\"_blockquote_13sb5_173\"\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e\u003cstrong\u003e\u003cspan\u003ePlease note:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e RCA cables are not included. If connecting to an aftermarket head unit, RCA cables will be required (sold separately).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003cp class=\"_p_13sb5_107\"\u003e \u003c\/p\u003e\n\u003ch3 class=\"_p_13sb5_107\"\u003e\u003cstrong\u003e\u003cspan\u003eKey Specifications:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul class=\"_ul_13sb5_144\"\u003e\n\u003cli\u003e\u003cspan\u003eDriver: 8\" (20cm) all-weather glass fibre woven cone\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEnclosure: Passive radiator sealed active enclosure\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAmplifier: Built-in 400W Class D\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInputs: High level \u0026amp; low level (OEM \u0026amp; aftermarket compatible)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDesign: Four-in-one underseat enclosure\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIncludes: Wiring kit (RCA cables not included)\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Maplin","offers":[{"title":"Default Title","offer_id":59903863587150,"sku":"5060801411080","price":149.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1026\/2619\/7838\/files\/a7fbcc5b4254f67d4b7e8a6e7c9cf8255bc2358b_INP031_FR_0.jpg?v=1781608022","url":"https:\/\/www.myrefurbtech.com\/products\/in-phase-car-audio-xtb-828r-underseat-subwoofer","provider":"MyRefurbTech","version":"1.0","type":"link"}