{"product_id":"rcf-nd940","title":"RCF ND940","description":"\u003cstrong\u003eOverview\u003c\/strong\u003e\u003cp\u003eThe ND940 is a ultra compact size, high performance, high power handling 4.0-inch diaphragm compression driver with a 1.4 inch exit throat. A thin copper ring is precision pressed on to the pole piece in order to modify and lower the inductance characteristics of the magnetic circuit and voice coil providing a controlled extension of the acoustic frequency response. The voice coil assembly is designed using a high strength, high temperature Kapton® voice coil former and edge wound copper clad aluminium wire directly joined to the diaphragm by RCF proprietary Direct Drive kapton technology. The ND940 features a 4-slot, optimised geometry, phase plug design. Extended computer assisted mathematical modelling and testing has resulted in a geometry that provides a balanced acoustic performance controlling and lowering air distortion and maximizing output.\u003c\/p\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003cli\u003e4.0 inch, Kapton former, edge wound aluminium voice coil\u003c\/li\u003e \u003cli\u003e280W continuous program power handling\u003c\/li\u003e \u003cli\u003eFrequency range: 500Hz - 20kHz\u003c\/li\u003e \u003cli\u003e4-slot optimized geometry phase plug\u003c\/li\u003e \u003cli\u003eTitanium diaphragm, Polyimide surround\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 Exit Throat Diameter : 1.4 inch \/ 36 mm \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Related Impedance : 8 ohm \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Program Power (watt) : 280 W \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Power handling capacity : 140 W \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Sensitivity : 110 dB \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Frequency range : 500 - 20000 Hz \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Diaphragm Material : Pure Titanium \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Suspension Material : Polyimide \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Suspension Design : Flat \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Minimum Impedance (ohm) : 8.50 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 : Edgewound Aluminum \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Voice Coil Former Design : Direct Drive Kapton \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Number of layers : 1 \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Kind of layers : outside \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Flux Density : 2.0 T \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Phase Plug Design : 4 slot \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Phase Plug Material : Aluminum \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Magnetics : Neodymium \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Voice Coil Demodulation Ring : Copper \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 Bl factor (Bl) (T x m) : 17.60 T x m \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 : 140 mm \/ 5.51 inches \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Overall height : 60 mm \/ 2.36 inches \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Mounting : 4 x 6 mm threaded holes at 90° \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 Weight : 2.72 kg \/ 6 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 : 79 mm \/ 3.11 inches \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Package Width : 169 mm \/ 6.65 inches \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Package Depth : 171 mm \/ 6.73 inches \u003c\/div\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cdiv\u003e Package Weight : 2.87 kg \/ 6.33 lbs \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e \u003c\/div\u003e","brand":"RCF","offers":[{"title":"Default Title","offer_id":43895055089707,"sku":"RCF-ND940","price":380.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0642\/3019\/5243\/files\/15129053-1__84867.1733296432.1280.1280.jpg?v=1775701202","url":"https:\/\/www.empirepro.com\/products\/rcf-nd940","provider":"Empire Pro","version":"1.0","type":"link"}