It requires amplification, and that element of electric sound is alien to opera.

However, what he says of the Chinese Government's attacking private enterprises as corrupt requires amplification.

"We are not playing in theaters that require amplification," he continued.

Hall effect devices produce a very low signal level and thus require amplification.

These do not ordinarily require amplification in such a situation and are hence free from distortion.

It requires amplification to produce a usable sound level.

Just that a larger speaker can typically handle more initial power and so requires less amplification to achieve the same high level of output.

She hadn't been asked a question, and she didn't require amplification of what she'd just been told.

Noises sound a 1/2 step higher than they are notated, and often require amplification.

They have also been used as microphones, with their high output requiring less amplification.