[. . . ] [. . . ] Rated Input : 92dB/W (m) : 18W Frequency Response / Impedance 110 100 90 80 70 60 50 (dB) 20 Hz 50 100 200 500 1000 60º 30º Impedance ohm 64 32 16 8 4 20000 Music Power : 60W Equivalent Diaghram Radius : 65mm (2. 559 in) Equivalent Mass Magnet Weight Net Weight Fs Re Qts Qms Qes Vas Xmax no : 6. 9g (0. 015 lb) : 330g (0. 728 lb) : : : : 1. 1kg (2. 425 lb) 50Hz 7. 2 ohm 0. 31 2000 5000 10000 Dimensions & Mounting Information R87 4-Ø5 Ø157. 6 Ø143. 6 Ø90 5. 3 : 32. 2 L : 1. 0mm (0. 039 in) : 1. 0% Ø160 166 45. 3 72. 3 : 4. 0 : 0. 34 [. . . ] [. . . ]