Realistic extended range reproduction from 25 Hz up to 2,500 Hz from a single driver.  High efficiency design with less than 0.3% distortion measured on an IEC soundboard at a distance of 100 cm. The pole pieces are manufactured to the closest tolerances to allow true magnetic symmetry for the underhung voice coil.  Gap geometry is optimized. The pole pieces are manufactured from ≥99.85% pure iron stock. The NAWI paper cone has a soft suspension and the cone apex can is treated to ensure maximum stiffness. The field-coil has exceptionally low resistance and is designed for use with a current source.

Frequency response = 25 – 2,500 Hz
Power handling = 75 Watts
Sensitivity = 97 dB @ 1W/1m
Diaphragm = driven by a 76 mm diameter voice coil on treated paper former
Flux density = 16,000 Gauss @ 3.5 A
Net weight = 15.3 kG
Diameter = 385 mm
Mounting hole diameter = Standard 370 mm 8 bolt mounting circle
Voice coil impedance = 8 and 16 Ohms
Resonance frequency = 20 Hz

A1500-II diagrams

Frequency response, impedance, impulse and step response

Closed field-coil motor model A1500-II

Christine von Langa - Roedlas 54 - D - 91077 Neunkirchen a. Br. - Phone +49 (0)9192 996926 - E-Mail: listen(at)wolfvonlanga.com -
WOLFVONLANGA produces audiophile field-coil loudspeakers and drive units. As a manufacturer we solely use the highest quality materials.
We deliver unique loudspeaker technology. All WOLFVONLANGA products are developed and handmade in Germany.
WOLFVONLANGA is a registered trademark.