This Mundorf VL300 coil is build from massive copper wires specially developed to help improve the audio quality when it comes to speaker filtering. This format belongs to Mundorf 's family of high-fidelity components the series of which is made for professional studio use.
 
The volume of the center space determines the inductance of the coil and requires great care in the manufacturing process. It must not be too small, otherwise saturation effects could occur at high load.

These coils are recommended for filtering speakers Their low impedance improves the impulse response (better light Speaker).