Soundsing Audio Manufacturing Co.,Ltd is one of the leading China 4.5" full range speaker manufacturers and suppliers,Website:://.soundsingpro.com, providing with column speakers wholesale, welcome to import high quality products from our factory. SD-40005A is a full range speaker. It has wide and smooth frequency range. It is used to replace bose speaker and for conference and public cabinet systems. We have 1 ohm also. Products specification   Size:4.5” Rated Power: 30W Peak Power: 60W Impedance: 4Ohm DC Impedance: 3.6 Ohm Sensitivity:92dB Frequency Response:150hz-15khz Voice Coil Diameter: 1 Inch Voice Coil Wire Material: ALU Bobbin Material: TIL Voice Coil Layers: 2 Layers Dampers: polycotton Cone: paper Magnet Size: 9.15OZ Mounting Detail: Outer diameter:124mm/4.5” Hole Cut Out diameter:108mm/4.25” Depth:55mm/2.16” Packing Information: 1 speaker one carton, 12 brown inner boxes packed into one brown outer box Carton Size:43*29.5*17.8CM Other Information Place of Original: Guangzhou, China Payment Terms: T/T, Western Union, Money Gram Port of Delivery: Huangpu, Guangzhou, China Production Lead Time:30days after receive 30% T/T