Usher 8945A Driver

Here we have an Usher 8945P Woofer (7 Inch Driver)

Good condition and original box.

Usher Specifications:

Nominal Independence: 8 Ohm +/- 15% @ 1.0 V 1 kHz

VC Nominal Dia: 42 mm

Lowest Resonance Frequency: FO = 35 Hz ± 3 Hz at 1.0 V

Effective Frequency Range: FO ~ 8 kHz – 10 dB 1 M/1 W

Output Sound Pressure Level: 87 dB/W/M ± 3 dB 200, 300, 400, 500Hz AVE

Input: Rated Input 😯 W; Maximum Input 90 W

Flux Density: 11 K ± 10% Gauss

Buzz & Rattle Test: 6.0 V

Polarity: Positive – (Left) Hand Terminal

Baffle Opening: 140 mm

Magnet Dimension / Weight: 120 x 60 x 25 (mm)/1055 g

Weight: 2300 g

Dropping Test: 1150mm 75° ± 2°

Linear Excursion (Xmax): 6 mm

Equivalent Air Volume (Vas): 34.2737 Litre

Mechanical Q (Qms): 1.962

Electrical Q (Qes): 0.366

Total Q (Qts): 0.309