Lowther PM7A Drive Unit
PM7A Drive Unit{short description of image}
DC Resistance of Voice Coil Re 7.4 ohms
Free Air Resonance Fo 45 Hz
Emission Piston Area Sd 0.021M²
Equivalent Volume Suspension Vas 55.907 Ltrs
Suspension Compliance Cms 892.762u M/N
Mass of Cone Mmd 11.0 g
Mass of Moving Parts Mms 12.75 g
Force Factor Bl 9.106 T-M
Mechanical Q Factor Qms 4.338
Electrical Q Factor Qes 0.328
Total Q Factor Qts 0.305
Voice Coil Inductance @ 1 kHz Le 103.671 uH
Reference Efficiency No 1.729%
Sound Pressure Level SPL 94.397 Db