They usually have a tiny hole at the other end, typicaly near the cable entry, or the cable entrance itself.
This is to equalize the diaphragm pressure when they are shipped by air plane etc.
If this hole is covered by hand while singing all the bass heavy ambience of a room disappears.
If one tries to sing near this tiny hole you have the most bass heavy sound. By covering the hole the mic has a natural sound even when picking sound from the back as you would expect from a pressure reading (omni) microphone.
Another trick that affects clarity is the polarity of connection of an unbalanced mic. This is described on the following euroelecton post.
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