{"product_id":"rcf-woofer-lf21x451-high-output-21-woofer-driver-4000w","title":"RCF Woofer LF21X451 High-Output 21\" Woofer Driver 4000W","description":"\u003cp\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003c\/p\u003e \u003cp data-start=\"0\" data-end=\"501\"\u003eThe RCF LF21X451 is a high-output 21-inch professional low-frequency woofer engineered for extreme bass performance in large-scale sound reinforcement and subwoofer systems. Designed for touring, live events, and high-powered installations, it combines massive low-frequency extension with excellent efficiency and long-term reliability. The driver uses an advanced neodymium magnet assembly and a reinforced cone structure to deliver powerful, controlled bass even at very high sound pressure levels.\u003c\/p\u003e \u003cp data-start=\"503\" data-end=\"1333\"\u003eThis woofer features a 21-inch diameter with an 8 ohm nominal impedance. It is rated at 2000 W AES continuous power handling with a program power capacity of 4000 W, making it suitable for the most demanding applications. Sensitivity is approximately 97 dB (1 W\/1 m), allowing for strong output with reduced amplifier strain. The frequency response extends down to around 30 Hz and up to 1 kHz, providing deep, impactful low-end performance. A large 4.5-inch inside\/outside copper voice coil ensures excellent heat dissipation and consistent performance under heavy loads. The rigid aluminum basket and optimized suspension system support high excursion while maintaining mechanical stability. The net weight of the driver is approximately 15.5 kg, offering a strong balance between power and portability for a 21-inch transducer.\u003c\/p\u003e \u003cp data-start=\"1335\" data-end=\"1470\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eThe RCF LF21X451 is an ideal choice for professional subwoofer designs where maximum bass output, clarity, and durability are critical.\u003c\/p\u003e","brand":"RCF","offers":[{"title":"Default Title","offer_id":51527766638912,"sku":"150-11100092","price":429.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/9322\/1184\/files\/e05b939d-2dc9-439d-8982-9f46151eaccf.jpg?v=1770878095","url":"https:\/\/www.simplysoundandlighting.co.uk\/fr\/products\/rcf-woofer-lf21x451-high-output-21-woofer-driver-4000w","provider":"Simply Sound and Lighting","version":"1.0","type":"link"}