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2. Tone control circuit - Wikipedia

   en.wikipedia.org/wiki/Tone_control_circuit

   A tone control circuit is an electronic circuit that consists of a network of filters which modify the signal before it is fed to speakers, headphones or recording devices by way of an amplifier. Tone controls are found on many sound systems: radios , portable music players , boomboxes , public address systems , and musical instrument amplifiers .

3. Constant-voltage speaker system - Wikipedia

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

   Multiple amplifiers can be combined together via transformers to yield higher voltage and higher current capacity lines. For instance, three 70-volt amplifiers have been used to make a 210-volt line by connecting them to a special-purpose external output transformer that has three primaries and a single secondary.

4. Harbor Freight Tools - Wikipedia

   en.wikipedia.org/wiki/Harbor_Freight_Tools

   In 1982, Harbor Freight Tools opened its first retail store in Lexington, Kentucky, to sell returned merchandise from its mail order business. The original location was at 1387 East New Circle Road. It later moved to 1301 Winchester Road, Suite 213. The venture proved successful, and Harbor Freight Tools began to open stores across the United ...

5. Audio power amplifier - Wikipedia

   en.wikipedia.org/wiki/Audio_power_amplifier

   The triode was a three-terminal device with a control grid that can modulate the flow of electrons from the filament to the plate. The triode vacuum amplifier was used to make the first AM radio. [2] Early audio power amplifiers were based on vacuum tubes and some of these achieved notably high audio quality (e.g., the Williamson amplifier of ...

6. Volume control - Wikipedia

   en.wikipedia.org/wiki/Volume_control

   Volume and Control Model, in sociology Topics referred to by the same term This disambiguation page lists articles associated with the title Volume control .

7. Presence (amplification) - Wikipedia

   en.wikipedia.org/wiki/Presence_(amplification)

   Presence controls can also be found on electric guitar amplifiers. The first presence control on a Fender amplifier, for example, appeared in 1954 on the Twin. In 1955 it appeared on the 1/15 Pro-Amp, the 3/10 Bandmaster, the 2/10 Super, [4] and the 4/10 Bassman. [5] The original Fender presence control acted upon the amplifier's negative ...

8. Audio crossover - Wikipedia

   en.wikipedia.org/wiki/Audio_crossover

   the power amplifiers are directly connected to the speaker drivers, thereby maximizing amplifier damping control of the speaker voice coil, reducing consequences of dynamic changes in driver electrical characteristics, all of which are likely to improve the transient response of the system; reduction in power amplifier output requirement.

9. Negative-feedback amplifier - Wikipedia

   en.wikipedia.org/wiki/Negative-feedback_amplifier

   Paul Voigt patented a negative feedback amplifier in January 1924, though his theory lacked detail. [4] Harold Stephen Black independently invented the negative-feedback amplifier while he was a passenger on the Lackawanna Ferry (from Hoboken Terminal to Manhattan) on his way to work at Bell Laboratories (located in Manhattan instead of New Jersey in 1927) on August 2, 1927 [5] (US Patent ...