{"product_id":"rcf-nd640-exit-1-4-90w-rms-180w-program-110-db-700-20khz-titanium","title":"RCF ND640 Exit:1.4\" 90W rms, 180W program. 110 dB, 700-20KHz -Titanium","description":"\u003ch2\u003eRCF ND640 Exit:1.4\" 90W rms, 180W program. 110 dB, 700-20KHz -Titanium\u003c\/h2\u003e\n\u003cp\u003eThe ND640 is a high performance 2.5-inch diaphragm compression driver with a 1.4 inch exit throat featuring the smallest size of the art technology. The diaphragm are precision completely formed from pure titanium. Voice coil assembly is designed using high temperature kapton former and it is joined to the diaphragm by RCF proprietary Direct Drive kapton technology. Diaphragm suspension is designed by extensive FEM study for low distortion and low frequency range extension.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2.5-inch Diaphragm, 1.4-inch Exit Throat \/ Pure Titanium Compression Driver\u003c\/li\u003e\n\u003cli\u003e180W continuous program power handling\u003c\/li\u003e\n\u003cli\u003eFrequency range: 700Hz - 20kHz\u003c\/li\u003e\n\u003cli\u003e3-slot optimized geometry phase plug\u003c\/li\u003e\n\u003cli\u003eTitanium diaphragm\u003c\/li\u003e\n\u003cli\u003eCopper inductance ring for extended response\u003c\/li\u003e\n\u003cli\u003eVented, damped, low distortion suspension system\u003c\/li\u003e\n\u003cli\u003eNeodymium magnet assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eGeneral Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExit Throat Diameter:\u003c\/strong\u003e 1.4 inch \/ 36 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Impedance:\u003c\/strong\u003e 8 ohm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProgram Power (watt):\u003c\/strong\u003e 180 W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Handling Capacity:\u003c\/strong\u003e 90 W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensitivity:\u003c\/strong\u003e 110 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Range:\u003c\/strong\u003e 700 - 20000 Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiaphragm Material:\u003c\/strong\u003e Pure Titanium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuspension Material:\u003c\/strong\u003e Pure Titanium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuspension Design:\u003c\/strong\u003e Double Roll\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Impedance:\u003c\/strong\u003e 7.50 ohm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoice Coil Diameter:\u003c\/strong\u003e 2.5 inch \/ 63 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoice Coil Winding Material:\u003c\/strong\u003e Edgewound Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoice Coil Former Design:\u003c\/strong\u003e Direct Drive Kapton\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Layers:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKind of Layers:\u003c\/strong\u003e Outside\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlux Density:\u003c\/strong\u003e 1.9 T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase Plug Design:\u003c\/strong\u003e 3 slot\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase Plug Material:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnetics:\u003c\/strong\u003e Neodymium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoice Coil Demodulation Ring:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eThiele - 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