BMS Midrange driver unit, model:4591 2" MIDDLE RANGE COMPRESSION DRIVER FEATURES : 2" Middle Range Driver Unique patented Design 118 dB sensitivity 1 W / 1 m 4591 SPECIFICATION Throat diameter: 2" (50.8 mm) Nominal impendance: 8 or 16 Ohm Power capacity (AES): 150 W AES above 400 Hz Peak Power: 1000 W peak above 500 Hz max. SPL (cont.): 136 dB at 150 W Sensitivity 1 W / 1 m: 118 dB Frequency Range: 200 - 9000 Hz Recommended Crossover: 300 Hz min. impedance modulus: 8.3 Voice Coil Diameter: 3.5" (90 mm) Magnet Material: Ferrite Flux Density (Tesla): 1.95 Efficiency: 35 % (300 - 5000 Hz) Voice Coil Material: Copper Clad Aluminum Voice Coil Former: Kapton TM Diaphragm Material: Polyester 300 Hz Crossover 90 mm Voice Coil 8 or 16 Ohm The BMS exclusive voice coil technology employs a light weight Copper Clad Aluminium wire wound inside and outsde of the Kapton™ former to improve the heat dissipation, dramtically increasing the acoustic output and reliability of the driver while minimising the power compression.

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