Usher 8137A Driver

Here we have an Usher 8137A Woofer.

Good condition and original box.

Usher Specifications:

Nominal Impedance: 8 Ohm ± 15% at 1.0 V 1 kHz

VC Nominal Dia: 38 mm

Lowest Resonance Frequency: FO = 32.73 Hz ± 3 Hz at 1.0 V

Effective Frequency Range: FO ~ 5 kHz – 10 dB 1 M/1 W

Output Sound Pressure Level: 88 dB/W/M ± 3 dB 300, A400, A500, 600Hz AVE

Input: Rated Input 80 W; Maximum Input 120 W

Flux Density: 11.7 K ± 10% GUASS

Buzz & Rattle Test: 8.0 V

Polarity: Positive – (Left) Hand Terminal

Baffle Opening: 160 mm

Magnet Dimension / Weight: 120 x 45 x 20 (mm)/935 g

Weight: 2440 g

Dropping Test: 1150 mm 75° ±2°

Linear Excursion (Xmax): 5 mm

Equivalent Air Volume (Vas): 60.9746 Litre

Mechanical Q (Qms): 2.081

Electrical Q (Qes): 0.482

Total Q (Qts): 0.392