We hooked a powerful amplifier up to the steel wall, making it in effect a huge radio transmitter.

His high volume and use of feedback required robust and powerful amplifiers.

If you have a high-end receiver with a powerful amplifier, look for a model that is capable of handling high power.

Networks of transistors are used to make powerful amplifiers with many different applications.

This sound system was equipped with a powerful amplifier and three horn loudspeakers.

This might be Jim's last chance of getting a comprehensible answer from earth till his ship reached the starbase and its powerful amplifiers.

Obviously, this level had to be moderate, so as to be within reach of the less powerful amplifiers in the group.

There was a portable phonograph on the floor and a powerful amplifier leant beside it against the rock wall.

At a receiver on the island, a powerful amplifier would raise that whisper to intelligible speech.

His loud volume and use of heavy strings required powerful and robust amplifiers.