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In ceiling speaker Junyu ODM in-ceiling speakers are housed in fully sealed, acoustic suspension enclosures that maintain consistent high quality sound performance regardless of the environment. These speakers feature acoustic resonance control technology to eliminate unwanted standing waves for smooth, uniform frequency response. Junyu inceiling speakers are available with 6-inch or 8-inch drivers and 1-inch silk-dome pivoting tweeters that allow users to control the direction of the sound, thus maximizing the sonic clarity of the room.I will be glad to make a quotation or samples for you. Please let me know at any time when I should do any assist. Test Item Specifications Test StatusImpedance8Ω ± 15 % AT 400 Hz 2.83VDCR6.3Ω ± 15 %Operation Must be normal Program source 50 WSweep test Must be normal Sine wave 14.1VFo90 Hz ± 20 % Without baffleSensitivity 88 ± 3 dB average at 400, 600 ,800,1000 Hz At 1W axis calculated From 1mRated freq.ResponseFo------- 20 KHz Sensitivity -10dBPower input Normal 50 W Maximum 90 WDistortion 5 % MAX AT 400 Hz 1 W 1 MLife testAfter test,meet Item 3,4&5pink Noise 50W 24hrHeat testAfter test,meet Item 3,4&655± 2 20 - 25% R.H. 16 hrHumidity testAfter test,meet Item 3,4&740± 2 90 - 95% R.H. 24 hrFlux densityAfter test,meet Item 3,4&8-10± 2 - R.H. 24 hrMain MagnetFerrite 100*50*18 Y30 18.7 oz or 530.14g