{"product_id":"rcf-lf18x400-woofer","title":"RCF LF18X400 Woofer","description":"\u003cdiv\u003eIncredibly linear frequency response characteristics, extreme high power handling while generating the lowest harmonic distortion of any comparable 18-inch transducer within its application range. \u003c\/div\u003e \u003cdiv\u003e \u003c\/div\u003e \u003cdiv\u003eThe \u003cspan style=\"font-weight: bold;\"\u003eLF18X400\u003c\/span\u003e uses a fibre loaded cone assembly along with a high excursion triple roll, constant geometry surround. A fully optimised T-pole design generate the minimum amount of flux modulation. The T-pole also features RCF Precision’s spaced gap demodulation technology, progressively braking the voice coil, providing a much smoother transition for the moving mass as it reaches its maximum excursion limits. Forced air venting system.\u003c\/div\u003e \u003cdiv\u003e \u003c\/div\u003e \u003cdiv\u003e\u003cspan style=\"font-weight: bold; text-decoration: underline;\"\u003eFeatures\u003c\/span\u003e\u003c\/div\u003e \u003cdiv\u003e \u003cul\u003e \u003cli\u003e4-inch, fiberglass inside\/outside copper voice coil\u003c\/li\u003e \u003cli\u003e2000W continuous program power handling\u003c\/li\u003e \u003cli\u003e97.5 dB Sensitivity\u003c\/li\u003e \u003cli\u003e25 Hz – 1 kHz Frequency range\u003c\/li\u003e \u003cli\u003eProgressive, spaced, aluminum demodulation rings\u003c\/li\u003e \u003cli\u003eForced air ventilation and 14 mm top plate for minimum power compression\u003c\/li\u003e \u003cli\u003eDual spider design with silicon based dampening control\u003c\/li\u003e \u003cli\u003eTriple roll surround and corrugated straight cone geometry\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e \u003cdiv\u003e\u003cspan style=\"font-weight: bold; text-decoration: underline;\"\u003eSpecifications\u003c\/span\u003e\u003c\/div\u003e \u003cdiv\u003e \u003cul\u003e \u003cli\u003eNominal Diameter: 460 \/ 18 mm\/inch\u003c\/li\u003e \u003cli\u003eRated Impedance: 8 Ω\u003c\/li\u003e \u003cli\u003eProgram Power: 2000 W AES\u003c\/li\u003e \u003cli\u003ePower handling capacity: 1000 W AES\u003c\/li\u003e \u003cli\u003eSensitivity: 97.5 dB\u003c\/li\u003e \u003cli\u003eFrequency Range: 25 Hz ÷ 1000 Hz\u003c\/li\u003e \u003cli\u003eEffective Piston Diameter: 395 \/ 15.6 mm\/inch\u003c\/li\u003e \u003cli\u003eMax Excursion Before Damage (peak to peak): 50 \/ 2.0 mm\/inch\u003c\/li\u003e \u003cli\u003eMinimum Impedance: 6.0 Ω\u003c\/li\u003e \u003cli\u003eVoice Coil Diameter: 100 \/ 4 mm\/inch\u003c\/li\u003e \u003cli\u003eVoice Coil Material: Copper\u003c\/li\u003e \u003cli\u003eVoice Coil Winding Depth: 25 \/ 1.0 mm\/inch\u003c\/li\u003e \u003cli\u003eNumber of layers: 2\u003c\/li\u003e \u003cli\u003eKind of layer: inside \/ outside\u003c\/li\u003e \u003cli\u003eTop Plate Thickness: 14\/0.55 mm\/inch\u003c\/li\u003e \u003cli\u003eCone Material: No pressed pulp\u003c\/li\u003e \u003cli\u003eCone Design: Straight\u003c\/li\u003e \u003cli\u003eSurround Material: Polycotton\u003c\/li\u003e \u003cli\u003eSurround Design: Triple roll\u003c\/li\u003e \u003cli\u003eResonance frequency: 28 Hz\u003c\/li\u003e \u003cli\u003eDC resistance: 5.1Ω\u003c\/li\u003e \u003cli\u003eMechanical factor: 6.5\u003c\/li\u003e \u003cli\u003eElectrical factor: 0.29\u003c\/li\u003e \u003cli\u003eTotal factor: 0.27\u003c\/li\u003e \u003cli\u003eBL Factor: 25 T · m\u003c\/li\u003e \u003cli\u003eEffective Moving Mass: 192 g\u003c\/li\u003e \u003cli\u003eEquivalent Cas air load: 340 liters\u003c\/li\u003e \u003cli\u003eEffettive piston area: 0.122 m²\u003c\/li\u003e \u003cli\u003eMax. linear excursion (mathematical): 9.0 mm\u003c\/li\u003e \u003cli\u003eVoice - coil inductance @ 1kHz: 2.3 mH\u003c\/li\u003e \u003cli\u003eHalf-space efficiency: 2.64%\u003c\/li\u003e \u003cli\u003eOverall Diameter: 465 \/ 18.3 mm\/inch\u003c\/li\u003e \u003cli\u003eBolt Circle Diameter: 442-447 \/ 17.4-17.6 mm\/inch\u003c\/li\u003e \u003cli\u003eBolt Hole Diameter: 6.5 \/ 0.25 mm\/inch\u003c\/li\u003e \u003cli\u003eFront Mount Baffle Cut-out: 424 \/ 16.7 mm\/inch\u003c\/li\u003e \u003cli\u003eRear Mount Baffle Cut-out: 424 \/ 16.7 mm\/inch\u003c\/li\u003e \u003cli\u003eDepth: 210\/8.3 mm\/inch\u003c\/li\u003e \u003cli\u003eVolume occupied by the driver: 7.0\/0.25 liters\/ft³\u003c\/li\u003e \u003cli\u003eNet Weight: 13.3 \/ 29.3 kg\/lbs\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e","brand":"RCF","offers":[{"title":"Default Title","offer_id":32388159176839,"sku":"LF18X400","price":509.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0319\/3687\/2583\/products\/img_proxy_f213a83e-1cf1-4245-89b6-87922559a8fc.jpg?v=1582296155","url":"https:\/\/www.balkanimal.com\/products\/rcf-lf18x400-woofer","provider":"Audiofeen","version":"1.0","type":"link"}