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2. Constant-voltage speaker system - Wikipedia

   en.wikipedia.org/wiki/Constant-voltage_speaker...

   600 watt transformers are widely available for contractors needing high power loudspeakers in constant-voltage installations. [12] Special-purpose transformers capable of handling 1250 watts down as low as 50 Hz are available. [4] One problem with high power, high current transformers is that fewer can be used on a single constant-voltage line.

3. Stage monitor system - Wikipedia

   en.wikipedia.org/wiki/Stage_monitor_system

   A large club may use several power amplifiers to provide 1000 to 2000 watts of power to the main speakers. An outdoor rock concert may use large racks of a number of power amplifiers to provide 10,000 or more watts. The monitor system in a coffeehouse or singer-songwriter stage for a small bar may be a single 100 watt powered monitor wedge.

4. Harman Kardon - Wikipedia

   en.wikipedia.org/wiki/Harman_Kardon

   Harman Kardon Festival D-1000 receiver, c. 1954. Advertised as having "all the critical electronic elements of a deluxe high-fidelity system on one compact, controlled chassis", the unit included a wide bandwidth FM radio tuner, a pre-amplifier and 20-watt amplifier with automatic loudness control all in a complete chassis. [9] [5] [10] [11]

5. Subwoofer - Wikipedia

   en.wikipedia.org/wiki/Subwoofer

   From about 1900 to the 1950s, the "lowest frequency in practical use" in recordings, broadcasting and music playback was 100 Hz. [9] When sound was developed for motion pictures, the basic RCA sound system was a single 8-inch (20 cm) speaker mounted in straight horn, an approach which was deemed unsatisfactory by Hollywood decisionmakers, who hired Western Electric engineers to develop a ...

6. JBL Paragon - Wikipedia

   en.wikipedia.org/wiki/JBL_Paragon

   The JBL Paragon, measuring almost 9 feet (2.7 m) from left to right. The JBL D44000 Paragon is a one-piece stereo loudspeaker created by JBL that was introduced in 1957 and discontinued in 1983; its production run was the longest of any JBL speaker. [1] At its launch, the Paragon was the most expensive domestic loudspeaker on the market. [2]

7. Audio power - Wikipedia

   en.wikipedia.org/wiki/Audio_power

   For most audio applications more power is needed at low frequencies. This requires a high-power amplifier for low frequencies (e.g., 200 watts for 20–200 Hz band), lower power amplifier for the midrange (e.g., 50 watts for 200 to 1000 Hz), and even less the high end (e.g. 5 watts for 1000–20000 Hz).