{"product_id":"dolby-cs128lf-dual-15-inch-low-frequency-screen-speaker","title":"Dolby CS128LF – Dual 15-Inch Low-Frequency Screen Speaker","description":"\u003ch2\u003eWhat is the Dolby CS128LF?\u003c\/h2\u003e\n\u003cp\u003eThe Dolby CS128LF is a low-frequency screen channel speaker with two custom 15-inch woofers. It is the LF component of both the Dolby System 126 and System 128, sitting beneath a CS126MH or CS128MH mid\/high cabinet. Its shallow cabinet suits auditoriums with tight spacing between the screen and the front wall.\u003c\/p\u003e\n\n\u003ch2\u003eHow does the Dolby CS128LF work?\u003c\/h2\u003e\n\u003cp\u003eEach 15-inch driver sits in an independent chamber within the cabinet for better performance and reliability, and critical driver spacing and alignment optimize vertical dispersion. Acoustic ports exit on both sides of the cabinet rather than the front, which keeps depth to 13.4 inches; the ports also act as integrated handles during unboxing and installation.\u003c\/p\u003e\n\u003cp\u003eA flip-card on the advanced input plate sets the wiring. In parallel mode both woofers run from one amplifier channel at 4 ohms; in independent mode each driver takes its own channel at 8 ohms to make full use of available amplifier power. The cabinet is rated at 600 W @ 49 Vrms with a 420 W measured power draw, covers 39 Hz to 255 Hz with 32 Hz usable response, and produces 129 dB continuous and 139 dB measured peak SPL at one metre.\u003c\/p\u003e\n\u003cp\u003eThe low-frequency feed comes from a \u003ca href=\"https:\/\/creationnetworks.net\/products\/dolby-atmos-cinema-processor-cp950a\"\u003eDolby CP950A\u003c\/a\u003e or \u003ca href=\"https:\/\/creationnetworks.net\/products\/dolby-cp950-audio-processor\"\u003eCP950\u003c\/a\u003e, amplified by a Dolby Multichannel Amplifier such as the \u003ca href=\"https:\/\/creationnetworks.net\/products\/dolby-professional-dma32301-32-channels-multichannel-amplifier\"\u003eDMA24302\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eWhat are the key features of the Dolby CS128LF?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual custom 15-inch woofers\u003c\/strong\u003e — two drivers deliver 39 Hz to 255 Hz with 129 dB continuous output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlip-card signal routing\u003c\/strong\u003e — choose parallel single-channel 4-ohm or independent dual-channel 8-ohm operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndependent driver chambers\u003c\/strong\u003e — separate chambers improve performance and reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSide-mounted ports\u003c\/strong\u003e — ports on each side reduce cabinet depth and double as handles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool-free input plate\u003c\/strong\u003e — high-current, spring-loaded terminals speed installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloor anchoring option\u003c\/strong\u003e — the BKT.FLR floor-bracket kit (sold separately) secures the speaker stack.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhere is the Dolby CS128LF typically used?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCinema auditorium (small to medium)\u003c\/li\u003e\n\u003cli\u003eScreening room\u003c\/li\u003e\n\u003cli\u003eAuditorium\u003c\/li\u003e\n\u003cli\u003eHouse of worship\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;max-width:640px;min-width:300px;table-layout:fixed;border-collapse:collapse;\"\u003e\n\u003ccolgroup\u003e\n\u003ccol style=\"width:38%\"\u003e\n\u003ccol style=\"width:62%\"\u003e\n\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003eCS128LF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eFrequency range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e39 Hz - 255 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eUsable LF response\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e32 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eCoverage window\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e160° H, 100° V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eRated impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e4 Ohms parallel \/ 8 Ohms x 2 (independent mode)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eSensitivity @ 1 W\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e101 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003ePower handling\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e600 W @ 49 Vrms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003ePower draw\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e420 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eMaximum voltage peak\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e138 Vpk\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eMax continuous SPL @ 1 m\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e129 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eMeasured peak SPL @ 1 m\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e139 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eTransducers\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e15\" woofer x (2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eInput\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003eAdvanced input plate w\/ flip card and high-current spring-loaded terminal block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eEnclosure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003eWood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eAccessories\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003eBKT.FLR floor bracket kit (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eDimensions (unit)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e40.59\" H x 32.74\" W x 13.4\" D (103.1 x 83.2 x 34 cm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eWeight (unit)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e128 lb (58.06 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eWeight (shipping)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e131 lb (59.42 kg)\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\u003ch3\u003eWhich Dolby systems use the CS128LF?\u003c\/h3\u003e\n\u003cp\u003eThe CS128LF is the low-frequency section of both the Dolby System 126 (with the CS126MH) and the System 128 (with the CS128MH).\u003c\/p\u003e\n\u003ch3\u003eIs it compatible with Dolby Atmos and the CP950A?\u003c\/h3\u003e\n\u003cp\u003eYes. It is part of Dolby's immersive screen speaker line and runs from processors such as the CP950A through Dolby Multichannel Amplifiers.\u003c\/p\u003e\n\u003ch3\u003eCan it run on one amplifier channel?\u003c\/h3\u003e\n\u003cp\u003eYes. Set the flip card to parallel mode for a single 4-ohm load, or to independent mode to drive each woofer at 8 ohms from separate channels.\u003c\/p\u003e\n\u003ch3\u003eHow is it secured?\u003c\/h3\u003e\n\u003cp\u003eThe optional BKT.FLR floor-bracket kit (sold separately) mechanically connects the speaker stack to the auditorium mounting surface. Follow the Dolby owner's manual.\u003c\/p\u003e\n\u003ch3\u003eWhat warranty and support come with it?\u003c\/h3\u003e\n\u003cp\u003eThe CS128LF carries Dolby's manufacturer warranty, confirmed with your quote. Creation Networks designs, installs and supports Dolby screen systems; see the \u003ca href=\"https:\/\/creationnetworks.net\/collections\/dolby-professional\"\u003eDolby Professional collection\u003c\/a\u003e and request a quote.\u003c\/p\u003e","brand":"Dolby Professional","offers":[{"title":"Default Title","offer_id":68118997041388,"sku":"CS128LF","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0603\/7982\/4364\/files\/cs128lf-image.jpg?v=1794127087","url":"https:\/\/creationnetworks.net\/products\/dolby-cs128lf-dual-15-inch-low-frequency-screen-speaker","provider":"Creation Networks","version":"1.0","type":"link"}