J SERIES LOUDSPEAKERS7Specifications J Center J50 J520M J620MApplication Center Bookshelf Bookshelf BookshelfChannelHigh Frequency 10mm Ti 2" Paper 10mm Ti 10mm TiDome Transducer Composite (Cone) Composite CompositeMidrange Transducer n/a n/a n/a n/a(Nitrile Polymer Fibre Cone)Low Frequency Transducer 2 x 3.5" 5" 5" 61⁄2"(Nitrile Polymer Fibre Cone) (Neo Magnet)Crossover Frequency 4.5kHz 2.2kHz 4.5kHz 4.5kHzFrequency 80 Hz to 75 Hz to 70 Hz to 55 Hz toResponse (– 6 dB) 20 kHz 20 kHz 20 kHz 20 kHzSensitivity (1 Watt/1 Meter) 87 dB 86 dB 87 dB 88 dBNominal Impedance 8 ohms 8 ohms 8 ohms 8 ohmsRecommended 10 to 80 10 to 50 10 to 75 10 to 100Amplifier Power* Watts Watts Watts WattsExternal DimensionsHeight 53⁄16" 11" 12" 15"Width 141⁄4" 61⁄2" 71⁄2" 81⁄2"Depth 65⁄8" 71⁄4" 81⁄2" 10"External DimensionsHeight 132 mm 280 mm 305 mm 381 mmWidth 362 mm 165 mm 190 mm 216 mmDepth 168 mm 184 mm 216 mm 254 mmWeight (each) 7 lbs 7 lbs 8 lbs 12 lbs3.2 kg 3.2 kg 3.6 kg 5.5 kgShipping Weight 10 lbs 18 lbs 20 lbs 28 lbs4.5 kg 8.2 kg 9.1 kg 12.7 kg*The maximum recommended amplifier power rating will insure proper system headroom to allowfor occasional program peaks. We do not recommend sustained operation at these maximumpower Levels.