Lucid Speaker is set on the ceiling and
every person located near or far from the speaker can hear at same db.
■ Comparison with other kinds of speaker
1. Lucid Speaker
: Every person located with different distances can hear at same dB.
2. Ceiling Speaker
: Only person located just below Ceiling Speaker can hear properly.
3. General Speaker attached on the wall
: Persons located with different distances hear at different dB.
In case of using test language ability, it would not be fair for everyone
because persons located nearer can hear louder.