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  2. Harbor Freight Tools - Wikipedia

    en.wikipedia.org/wiki/Harbor_Freight_Tools

    In 2022, Harbor Freight Tools opened a distribution center in Joliet, Illinois, spanning 1.6 million square feet in size and creating 800 new jobs. [13] In 2023 and 2024, Harbor Freight Tools was certified as a Great Place to Work. [5]

  3. Heathkit - Wikipedia

    en.wikipedia.org/wiki/Heathkit

    Oscilloscope OL-1 from 1954, the company's first with a relatively small 3-inch CRT which allowed for a highly competitive price of US$ 29.50 (equivalent to $335 in 2023) for the DIY kit. [1] Heathkit is the brand name of kits and other electronic products produced and marketed by the Heath Company.

  4. Sinclair Radionics - Wikipedia

    en.wikipedia.org/wiki/Sinclair_Radionics

    Another Sinclair Radionics product that was introduced in 1964 and failed was the first class D amplifier kit rated at 10 watt RMS: [citation needed] a class D switching amplifier that was good in theory but sadly ahead of its time and available technology. The amplifier used low-frequency germanium transistors as pulse width modulators and ...

  5. 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.

  6. 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 ...

  7. 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 .

  8. Equalization (audio) - Wikipedia

    en.wikipedia.org/wiki/Equalization_(audio)

    The number of frequency channels may be matched to the requirements of the intended application. A car audio equalizer might have a total of five to ten frequency bands. An equalizer for professional live sound reinforcement typically has some 25 to 31 bands, for more precise control of feedback problems and equalization of room modes.

  9. Audio power - Wikipedia

    en.wikipedia.org/wiki/Audio_power

    Audio power is the electrical power transferred from an audio amplifier to a loudspeaker, measured in watts.The electrical power delivered to the loudspeaker, together with its efficiency, determines the sound power generated (with the rest of the electrical power being converted to heat).

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