Facts about Speakers
- 09
Marshall amplifiers became the standard for rock music venues after Jim Marshall invented the 100-watt stack in 1962, which could fill large arenas with guitar sound without distortion.
- 08
JBL invented the first horn-loaded speaker system in 1927, which used a mechanical horn to amplify sound waves before electronic amplification became practical for public address systems.
- 07
Cone diaphragms in dynamic speakers vibrate at frequencies ranging from 20 hertz to 20,000 hertz, with larger cones handling lower frequencies and smaller tweeters reproducing higher frequencies simultaneously through crossover networks.
- 06
Subwoofers typically operate between 20 and 200 hertz frequencies, with 20 hertz representing the lowest frequency audible to human hearing and the threshold below which sound becomes tactile vibration rather than heard sound.
- 05
A 15-watt amplifier powering a speaker can produce approximately 110 decibels of sound pressure level, equivalent to a chainsaw at one meter distance.
- 04
Bluetooth speakers transmit audio at 2.4 gigahertz frequency with a maximum range of approximately 30 meters, though walls and interference typically reduce this distance by 50 percent or more.
- 03
Dolby Atmos technology, introduced in 2012, uses 128 independent audio channels to create three-dimensional surround sound in cinema speakers positioned above and around audiences.
- 02
In 1877, Thomas Edison invented the phonograph with a tinfoil cylinder that could record and playback sound through a small speaker cone vibrated by a stylus.
- 01
The Neumann U47 microphone, first produced in 1949, became the gold standard for studio speakers and vocal recording, with original units now selling for over $10,000.