This Mundorf VL250 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.
 
As most of Mundorf coils, the inner volume central space determines the inductance of the coil and requires a lot of care in the manufacturing process.
It should not be too small, otherwise saturation effects might occur at high load.

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