{"product_id":"rcf-l18p400","title":"RCF L18P400","description":"\u003cstrong\u003eOverview\u003c\/strong\u003e\u003cp\u003eIncredibly linear frequency response characteristics, extreme high power handling while generating the lowest harmonic distortion of any comparable 18-inch trasducer wtihin its application range. The L18P400 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 reachees its maximum excursion limits.Forced air venting system.\u003c\/p\u003e\u003cstrong\u003eFeatures\u003c\/strong\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\u003eAluminum demodulation ring\u003c\/li\u003e \u003cli\u003eForced air ventilation and 15mm 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\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003cdiv\u003e \u003cstrong\u003e General specifications \u003c\/strong\u003e \u003cdiv\u003e\u003cdiv\u003e \u003cdiv\u003e \u003cdiv\u003e \u003cdiv\u003e Nominal Diameter : 18 inch \/ 457 mm \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Rated Impedance : 8 ohm \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Program Power (watt) : 2000 W \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Power handling capacity : 1000 W \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Sensitivity : 97.5 dB \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Frequency range : 25 - 1000 Hz \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Effective piston diameter : 395 mm \/ 15.55 inch \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Max. Excursion Before Damage : 50 mm \/ 1.97 inch \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Minimum Impedance (ohm) : 6.5 ohm \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Voice Coil Diameter : 4.0 inch \/ 102 mm \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Voice Coil Winding Material : Copper \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Voice Coil Length : 25 mm \/ 0.98 inch \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Number of layers : 2 \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Kind of layers : inside\/outside \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Top Plate Thickness : 15 mm \/ 0.59 inch \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Cone Design : Straight \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Surround Material : Polycotton \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Surround Design : Triple roll \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Magnets : Ceramic \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Dual-force air ventilation : Yes \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Spider : 03 \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e\u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cstrong\u003e Thiele - small parameters \u003c\/strong\u003e \u003cdiv\u003e \u003cdiv\u003e \u003cdiv\u003e \u003cdiv\u003e Resonance frequency (Fs) : 29 Hz \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e DC resistance (Re) (ohm) : 5.10 ohm \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Mechanical factor : 7.60 Qms \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Electrical factor : 0.29 Qes \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Total factor : 0.28 Qts \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Bl factor (Bl) (T x m) : 24.60 T x m \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Effective moving mass (Mms) : 200.0 g \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Equivalent Cas air loaded (Vas) : 340.0 liters \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Effective piston area (Sd) : 0.120 m2 \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Max. linear excursion (Xmax) : 9 mm \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Voice coil inductance @ 1kHz (Le1k) : 1.20 mH \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Half-space efficency (Eff) : 2.63% \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cstrong\u003e Mounting information \u003c\/strong\u003e \u003cdiv\u003e \u003cdiv\u003e \u003cdiv\u003e \u003cdiv\u003e Overall diameter : 465 mm \/ 18.31 inches \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Bolt circle diameter : 442-447 mm \/ 17.4-17.6 inch \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Bolt hole diameter : 7 mm \/ 0.28 inch \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Front mount baffle cut-out : 424 mm \/ 16.69 inch \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Rear mount baffle cut-out : 425 mm \/ 16.73 inch \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Volume occupied by the driver : 6 liters \/ 0.24 ft3 \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cstrong\u003e Standard compliance \u003c\/strong\u003e \u003cdiv\u003e \u003cdiv\u003e \u003cdiv\u003e \u003cdiv\u003e Safety agency : CE compliant \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cstrong\u003e Size \/ Weight \u003c\/strong\u003e \u003cdiv\u003e \u003cdiv\u003e \u003cdiv\u003e \u003cdiv\u003e Height : 206 mm \/ 8.11 inches \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Diameter : 465 mm \/ 18.31 inches \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Weight : 13.5 kg \/ 29.76 lbs \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cstrong\u003e Shipping information \u003c\/strong\u003e \u003cdiv\u003e \u003cdiv\u003e \u003cdiv\u003e \u003cdiv\u003e Package Height : 270 mm \/ 10.63 inches \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Package Width : 520 mm \/ 20.47 inches \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Package Depth : 500 mm \/ 19.69 inches \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Package Weight : 15.5 kg \/ 34.17 lbs \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e","brand":"RCF","offers":[{"title":"Default Title","offer_id":43895052402731,"sku":"RCF-L18P400","price":411.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0642\/3019\/5243\/files\/11100044-1__22735.1733299965.1280.1280.jpg?v=1775701187","url":"https:\/\/www.empirepro.com\/products\/rcf-l18p400","provider":"Empire Pro","version":"1.0","type":"link"}