Where can I buy the cheapest active ceiling speakers ceiling speaker factory wholesale prices

Where can I buy the cheapest active ceiling speakers ceiling speaker factory wholesale price series Model Model AP-9030 loudspeaker Loudspeaker 5.5 inch nominal voltage power Rated voltage power 100V, 8W Frequency Response Frequency Response 120-18KHz sensitivity Sensitivity 90dB Dimensions (WLH) Exterior size 220 * 75mm installation size Installation size 175mm Packing (pcs / box) APckaging volume 28 Price: 1.00 yuan active ceiling speakers, ACE active ceiling speakers, active ceiling speakers factory, active Ceiling Speaker Horn is a kind of electrical energy into sound of a switching device, when different electron energy spread coil, the coil generates a magnetic field to interact with an energy magnet, this interaction causes the tray vibration, because the electron energy change at any time, Speaker of the coil will move forward or backward movement, so the speaker will follow the movement of the tray, which makes this action density level changes arising from the air to produce sound.