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2. Electrostatic loudspeaker - Wikipedia

   en.wikipedia.org/wiki/Electrostatic_loudspeaker

   After the war, he developed manufacturing technique for electrostatic speakers, to be used with conventional cone woofers, known as electrostatic hybrids. He licensed Neshaminy Electric to make these speakers. In the early 1970s, Electronic Industries of Minneapolis took over the license and rights to make JansZen electrostatic speakers.

3. Loudspeaker - Wikipedia

   en.wikipedia.org/wiki/Loudspeaker

   A loudspeaker (commonly referred to as a speaker or, more fully, a speaker system) is a combination of one or more speaker drivers, an enclosure, and electrical connections (possibly including a crossover network). The speaker driver is an electroacoustic transducer [1]: 597 that converts an electrical audio signal into a corresponding sound. [2]

4. Directional sound - Wikipedia

   en.wikipedia.org/wiki/Directional_sound

   Traditional speaker arrays can be fabricated in any shape or size, but a reduced physical dimension (relative to wavelength) will inherently sacrifice directivity in that dimension. The larger the speaker array, the more directional, and the smaller the size of the speaker array, the less directional it is.

5. Plasma speaker - Wikipedia

   en.wikipedia.org/wiki/Plasma_speaker

   Plasma speakers or ionophones are a form of loudspeaker which varies air pressure via an electrical plasma instead of a solid diaphragm. The plasma arc heats the surrounding air causing it to expand. The plasma arc heats the surrounding air causing it to expand.

6. Acoustic Research - Wikipedia

   en.wikipedia.org/wiki/Acoustic_Research

   Acoustic Research was a Cambridge, Massachusetts-based company that manufactured high-end audio equipment. The brand is now owned by VOXX.Acoustic Research was known for the AR-3 series of speaker systems, which used the 12 in (300 mm) acoustic suspension woofer of the AR-1 with newly designed dome mid-range speaker and high-frequency drivers.

7. Use this simple trick to make your phone speaker louder - AOL

   www.aol.com/news/2015-08-04-use-this-simple...

   Easier than making cereal for breakfast. Step 1 - Take a bowl. Step 2 - Throw your phone into it. The shape of the bowl will work as an amplifier and the sound coming out of your phone will be ...