They are highly suitable to be used for high quality mid frequency crossover within subwoofer applications. They also offer an excellent value for money ratio as well as the come at compact dimensions.
The BS series which was entirely re-developed in 2010, has replaced the well-known i and Bi series.
Feron core coil (wire with 0.71 mm diameter)
Feron core coil (wire with 1.0 mm diameter)
Feron core coil (wire with 1.25 mm diameter)
Feron core coil (wire with 1.4 mm diameter)