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Scan-Speak 10F/4424G00 Discovery 4″ Midrange in 4 ohm The Discovery series is designed for the discerning audiophile customer. To meet the needs of this audience, several new technologies were developed with the goal of lowering distortion and damping in the speaker. The coated fiberglass cone reduces vibration and standing waves, and the vented motor system minimizes power compression. The combined result is a very open and dynamic sound. Very wide Frequency Range Coated NRSC Fibre Glass Cone (patent) Compact Size Neodymium magnet Aluminum Chassis High Sensitivity 90dB / 2,83V SBR Rubber Surround Copper Cap on Pole Piece Madisound recommends: Vented – a 1.2 liters vented box with a 1″ diameter vent by 3″ long your F3 is 125Hz Sealed – a 1 liter sealed box your F3 is 275Hz