ITEM NAME:DDT-S30 car stereo speakers music soft dome balanced car tweeters 360W EP+c FT Power Handling: Peak: 360 watts per pair / 180 watts each RMS: 100 watts per pair / 50 watts each Frequency Response: 4,000 Hz - 26,000 Hz Impedance: 4 Ohms Sensitivity : 90 dB/W at 1m Installation hole diameter is 49CM, total diameter is 57CM, depth is 18CM. Screwing and double-sided gluing can be used. It is recommended to install position A column. Packing: 1Set.Screwing and double-sided gluing can be used. Sensitivity : 90 dB/W at 1m. RMS: 100 watts per pair / 50 watts each. Power Handling.