Product Name: SL-E13 Flat Panel Speaker Exciter 4ohm 10W 44mm Model NO.: SL-E13 Brand: Recon WORD nChannels: 2.1Channel Usage: Accept Radiation Mode: Indirect Radiation Type Style: Portable Transducer Principle: Electrostatic Earphone Cone: Polypropylene and Titanium Edge Transmission Mode: Bone Conduction Category: Speaker Output Power: 8ohm 10W Diameter: 44mm Trademark: recon Transport Package: Carton Specification: exciter speaker 4ohm/8ohm 10W Origin: China Product Description lat panel speaker exciter 4ohm 10W 44mm,sound exciter, surface conducting transducerModelSL-E13Dimensiondiamter 44mm*H16.3mmNominal Impedance 4Ohm±15% At1000 HZPower Rating10 watt MAX 15WLowest Resonant requency500±20% HZ.Output Sound Pressure Level(S.P.L)85 ± 3db/0.1 Watt.10CMeter.Average at800,1000,1200,1500HZ.Frequency RangF0-2KHZ ,Average SPL±10dbDistortion3%Maxium At1000HZ 2WPolarityDiaphragm shall move forward when Apply a Postive DC current the "+" or"Marked" TerminalLoad TestBt Audio Singnal Generator At 2.83Volts.total 48 hours and20~20KHZ Resonant FrequencyAbnormal Sound TestMust be Normally tasted Bt 2.83 Volts Sinwave