Basic Audio is a free introductory textbook to the basics of audio physics and electronics. The second type of shielding uses a different principle, but is also effective against magnetic fields.
Outside the shield, the two fields are in the same direction and the combined magnetic field is increased.
With input transformers, which are particularly susceptible to magnetic fields because they have a magnetic core, the shielding often consists of an arrangement combining magnetic and electromagnetic shielding into one composite assembly. Your use of this website constitutes acknowledgement and acceptance of our Terms & Conditions.

Electromagnetic shielding does not use a magnetic material, but rather one that conducts electric current well, such as copper or aluminum.
As well as providing increased protection, the combination makes the arrangement more effective over the entire frequency range.
When the magnetic field causing the induction fluctuates, it causes current to flow in the shield. Because it depends on fluctuating fields, this kind of shield is completely ineffective against steady magnetism. The magnetic shielding takes care of frequencies down to zero or d-c and begins to become ineffective at frequencies between 60 to 300 cycles.

This current in the shield sets up its own magnetic field that opposes the original inducing magnetism, and the two fields tend to cancel inside the shield. It is also comparatively ineffective against low-frequency fluctuation, and only becomes really effective at higher frequencies.
The electromagnetic shield^on the other hand, begins to become effective between 60 and 300 cycles, and the combined protection is effective for all frequencies.

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