{"product_id":"stage9-mccauley-m421-quad-21-subwoofer","title":"McCauley M421 Quad 21-inch Subwoofer | Ultra-low Bass","description":"The McCauley M421 is a quad 21-inch subwoofer built for uncompromising ultra-low frequency reinforcement in the most demanding environments. Four high-excursion 21-inch neodymium transducers with 6-inch voice coils deliver immense headroom and tightly controlled response, reaching confidently into infrasonic territory. With a frequency response of 20–85 Hz (-3 dB) and usable extension from 16–120 Hz (-10 dB), the M421 produces authoritative, musical low end that retains definition at extreme levels.\n\nEngineered for scale and reliability, the M421 achieves up to 143 dB continuous (155 dB peak) at 1 metre, pairing seamlessly with modern high-output amplification thanks to robust power handling in excess of 12,000 W continuous (24,000 W peak). Its design supports deployment as a single high-impact enclosure or in larger arrays where uniform coverage and consistent low-frequency impact are essential. Built to tour-grade standards, it offers the output, clarity and resilience required by professional rental, touring and premium fixed installations.\n\nChoose the M421 when you need extreme low-frequency extension and clean, controlled impact for arenas, festivals, large-format clubs and high-end installs.\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMcCauley M421 Quad 21-inch Subwoofer | Ultra-low bass\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003csmall\u003e\u003cstrong\u003eSTAGE9.3.100.000\u003c\/strong\u003e\u003c\/small\u003e\u003c\/p\u003e","brand":"Mccauley","offers":[{"title":"Used Equipment","offer_id":57401086247289,"sku":null,"price":3449.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0288\/2260\/1776\/files\/mccauley-m421-quad-21-subwoofer_02186-768x1401.jpg?v=1780925183","url":"https:\/\/stage-experts.com\/products\/stage9-mccauley-m421-quad-21-subwoofer","provider":"Stage Experts Ltd","version":"1.0","type":"link"}