Product Name: Full Range 2.5inch 4ohm 3watt Subwoofer Loud Speaker for Audio Test System with Bluetooth Model NO.: LS66HW4-3W Brand: Jy Certification: ISO9001, CE, RoHS WORD nChannels: 2.1Channel Usage: Expand Volume Radiation Mode: Indirect Radiation Type Style: Portable Transducer Principle: Dynamic Earphone Cone: Polypropylene and Titanium Edge Transmission Mode: Air-conduction Category: Speaker Dimension: 66mm*22mm Sound Pressure Level: 98 dB (at 1.0W/0.1m with Baffle Avg0.8K,1.0K1.2 Voice Coil Imp: 4ohm Rated(Max.)Power: 3.0W Trademark: JY Transport Package: Paper Specification: 66mm*22mm Origin: China HS Code: 85318090 Product Description Product model:Φ66mmRelated model:LS66HW4-3WPeoduct impedance:4Ω±15%Product power:3wFrequency Range:FO:20~20KHZResonant Range:300HZ±20%Sound pressure level:95±3dB