{"product_id":"james-loudspeaker-st15-4-passive-15-subwoofer-4-ohm","title":"James Loudspeaker ST15-4 - Passive 15\" Subwoofer 4 Ohm","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe James Loudspeaker ST15 4 Ohm is a passive 15\" subwoofer wired for 4-ohm operation, built for commercial AV installations that demand the deepest low-frequency reinforcement on low-impedance amplifier channels. Its 15-inch driver delivers powerful bass for large theaters, auditoriums, and high-end residential spaces, making this 4-ohm passive subwoofer the top of the ST range. As a passive sub, it runs from an external subwoofer amplifier. The ST15 4 Ohm suits integrators specifying maximum-output low-impedance bass.\u003c\/p\u003e\u003ch2\u003eProduct Description\u003c\/h2\u003e\u003cp\u003eThe ST15-4 is part of the James Loudspeaker ST subwoofer family, where the suffix indicates electrical configuration. The 15 indicates a 15-inch driver and the -4 indicates 4-ohm wiring suited to standard low-impedance amplifier outputs. Because it is passive, the ST15-4 requires an external subwoofer amplifier, leaving power and signal processing under the integrator's control. It is the impedance counterpart to the 70V ST15-70, which shares the same 15-inch driver but is wired for constant-voltage distribution, and it is the largest driver in the ST range, stepping up in displacement from the ST12-4. The full lineup is available in the \u003ca href=\"https:\/\/creationnetworks.net\/collections\/james-loudspeaker\"\u003eJames Loudspeaker collection\u003c\/a\u003e. This makes the ST15-4 a practical specification for maximum-output low-impedance subwoofer systems.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e15-Inch Driver\u003c\/strong\u003e — A single 15-inch woofer delivers the highest output in the ST range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-Ohm Configuration\u003c\/strong\u003e — Wired for 4-ohm operation to match low-impedance amplifier channels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePassive Operation\u003c\/strong\u003e — Driven by an external subwoofer amplifier for full integrator control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eST Family Compatibility\u003c\/strong\u003e — Matches other ST subwoofers for consistent multi-zone specification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge-Room Output\u003c\/strong\u003e — Sized for large theaters and auditoriums needing deep bass.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMaximum-output low-frequency systems\u003c\/li\u003e\n\u003cli\u003eLarge commercial theaters and auditoriums\u003c\/li\u003e\n\u003cli\u003eMulti-zone audio installations\u003c\/li\u003e\n\u003cli\u003eHigh-end residential and hospitality spaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cdiv style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;min-width:480px;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003ePassive Subwoofer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eDriver Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e15\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eDistribution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e4-Ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eOperation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003ePassive (requires external amplifier)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eDoes the ST15-4 need an amplifier?\u003c\/strong\u003e\u003cbr\u003eYes. It is a passive subwoofer and requires an external subwoofer amplifier.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat impedance is it?\u003c\/strong\u003e\u003cbr\u003eIt is wired for 4-ohm operation to match low-impedance amplifier channels.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the driver size?\u003c\/strong\u003e\u003cbr\u003eThe ST15-4 uses a single 15-inch driver.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it differ from the ST15-70?\u003c\/strong\u003e\u003cbr\u003eThe ST15-70 is the 70V version of the same 15-inch driver, wired for constant-voltage distribution instead of 4-ohm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it the largest ST subwoofer?\u003c\/strong\u003e\u003cbr\u003eYes. The 15-inch driver gives it the greatest displacement in the ST range.\u003c\/p\u003e","brand":"James Loudspeaker","offers":[{"title":"Default Title","offer_id":47710419583212,"sku":"60215","price":6120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0603\/7982\/4364\/files\/h7hix8yeq1ofjqwljocv_9e296584-96ed-4ba9-accd-18c03ec26b10.png?v=1780840753","url":"https:\/\/creationnetworks.net\/products\/james-loudspeaker-st15-4-passive-15-subwoofer-4-ohm","provider":"Creation Networks","version":"1.0","type":"link"}