{"product_id":"james-loudspeaker-st21-4-passive-21-subwoofer-4-ohm","title":"James Loudspeaker ST21-4 - Passive 21\" Subwoofer 4 Ohm","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe James Loudspeaker ST21-4 is a passive 21-inch subterranean subwoofer engineered for high-SPL, deep bass output in outdoor commercial and residential landscape audio systems. This 4-ohm in-ground subwoofer uses a single large 21-inch transducer optimized for maximum excursion to deliver low-end performance across patios, grounds, and exterior gathering areas. It is built for buried installation so the low-frequency foundation of an outdoor system stays hidden from view. Pair it with James landscape satellites and a matched amplifier for a complete exterior audio deployment.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"http:\/\/sonance.com\/cdn\/shop\/files\/ina6pewlb5kw2t6awmpr.png?v=1776730342\" alt=\"James Loudspeaker ST21-4 passive 21-inch subterranean outdoor subwoofer\" loading=\"lazy\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe ST21-4 is a subterranean subwoofer designed to be buried below grade, with its 21-inch transducer optimized for maximum excursion and high SPL. This large driver moves substantial air to provide the low-frequency output that landscape satellite speakers cannot produce on their own, filling open outdoor areas with even, impactful bass. As a 4-ohm, low-impedance model, it is intended for a dedicated amplifier channel where a single subwoofer anchors the low end of an exterior zone. The subterranean design keeps the enclosure and driver out of sight, leaving only a discreet ground-level vent in the finished landscape.\u003c\/p\u003e\n\u003cp\u003eIn deployment, the ST21-4 fits hospitality grounds, resort landscapes, restaurant and bar patios, and high-end residential gardens where outdoor audio must include convincing low frequencies without visible hardware. It is well matched with James all-terrain landscape satellites for full-range coverage. For above-ground outdoor low-frequency and full-range options, explore the broader \u003ca href=\"https:\/\/creationnetworks.net\/collections\/james-loudspeaker\"\u003eJames Loudspeaker collection\u003c\/a\u003e available through Creation Networks. Plan amplifier power and burial location during system design for best in-ground response.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e21-inch subterranean transducer\u003c\/strong\u003e — A single large driver optimized for maximum excursion delivers high-SPL bass in open outdoor areas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuried, hidden installation\u003c\/strong\u003e — The in-ground design keeps the subwoofer out of sight, leaving only a discreet ground-level vent.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh SPL output\u003c\/strong\u003e — Optimized excursion produces the output needed to fill large exterior spaces with deep bass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ohm operation\u003c\/strong\u003e — Low-impedance design suits a dedicated amplifier channel for an outdoor zone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutdoor landscape design\u003c\/strong\u003e — Built specifically for exterior installations and landscape audio systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSatellite pairing\u003c\/strong\u003e — Provides the low-frequency foundation for James all-terrain landscape satellite speakers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eHospitality grounds and resort landscapes\u003c\/li\u003e\n\u003cli\u003eRestaurant, bar, and cafe patios\u003c\/li\u003e\n\u003cli\u003ePool decks and outdoor dining areas\u003c\/li\u003e\n\u003cli\u003eCorporate and government campus grounds\u003c\/li\u003e\n\u003cli\u003eHigh-end residential gardens and outdoor entertainment areas\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;min-width:480px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eConfiguration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003ePassive Subterranean Subwoofer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eTransducer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e(1) 21 in, Maximum-Excursion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eNominal Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e4 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eIn-Ground \/ Subterranean\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eOutdoor \/ Landscape\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\u003eHow is the ST21-4 installed?\u003c\/strong\u003e\u003cbr\u003eIt is a subterranean subwoofer designed to be buried below grade, leaving only a discreet ground-level vent visible in the finished landscape. Plan the burial location and drainage during system design.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does it connect to an amplifier?\u003c\/strong\u003e\u003cbr\u003eThe ST21-4 is a passive 4-ohm subwoofer for a dedicated amplifier channel. Match amplifier power to the size of the outdoor zone and keep the channel's minimum impedance rating in mind.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat speakers pair with it?\u003c\/strong\u003e\u003cbr\u003eIt is designed to provide low frequencies for James all-terrain landscape satellite speakers. Creation Networks can recommend a matching satellite and amplifier package for your area.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it rated for full outdoor exposure?\u003c\/strong\u003e\u003cbr\u003eYes. It is engineered specifically for in-ground outdoor installation in landscape audio systems.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many satellites can one ST21-4 support?\u003c\/strong\u003e\u003cbr\u003eThat depends on zone size and amplifier power. Creation Networks can help size the subwoofer-to-satellite ratio for even coverage across your space.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat warranty and support are available?\u003c\/strong\u003e\u003cbr\u003eJames Loudspeaker products are covered by the manufacturer's warranty. For current warranty terms, system design assistance, or volume pricing, contact the Creation Networks team via \u003ca href=\"https:\/\/creationnetworks.net\/collections\/james-loudspeaker\"\u003ecreationnetworks.net\u003c\/a\u003e.\u003c\/p\u003e","brand":"James Loudspeaker","offers":[{"title":"Default Title","offer_id":47710419648748,"sku":"60217","price":15245.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0603\/7982\/4364\/files\/h7hix8yeq1ofjqwljocv_c0954c78-8aa0-417e-bf34-dc911e0c6e93.png?v=1780840760","url":"https:\/\/creationnetworks.net\/products\/james-loudspeaker-st21-4-passive-21-subwoofer-4-ohm","provider":"Creation Networks","version":"1.0","type":"link"}