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  2. Sennheiser MD 441 - Wikipedia

    en.wikipedia.org/wiki/Sennheiser_MD_441

    The MD 441 has a supercardioid polar pattern, with a frequency response of 30 to 20,000 Hertz, sensitivity of 1.8 mV/Pa ±2 dB [2], and Impedance of 200 Ohms. It also features a hum compensation coil. Like the MD 421, the MD 441 has a five-stage bass switch.

  3. Sennheiser MD 421 - Wikipedia

    en.wikipedia.org/wiki/Sennheiser_MD_421

    It is known for its almost linear frequency response in the bass range up to 1,000 Hz. Above that, the microphone exhibits a smooth increase in upper mid-range frequencies important for intelligibility. In 1966, Udo Jürgens won the Eurovision Song Contest, singing the song "Merci, Chérie" into an MD 421. By 1971, the contest was almost ...

  4. Dimensionless numbers in fluid mechanics - Wikipedia

    en.wikipedia.org/wiki/Dimensionless_numbers_in...

    Dimensionless numbers (or characteristic numbers) have an important role in analyzing the behavior of fluids and their flow as well as in other transport phenomena. [1] They include the Reynolds and the Mach numbers, which describe as ratios the relative magnitude of fluid and physical system characteristics, such as density, viscosity, speed of sound, and flow speed.

  5. Room modes - Wikipedia

    en.wikipedia.org/wiki/Room_modes

    Most rooms have their fundamental resonances in the 20 Hz to 200 Hz region, each frequency being related to one or more of the room's dimensions or a divisor thereof. These resonances affect the low-frequency low-mid-frequency response of a sound system in the room and are one of the biggest obstacles to accurate sound reproduction.

  6. Four-frequency - Wikipedia

    en.wikipedia.org/wiki/Four-frequency

    The four-frequency of a massless particle, such as a photon, is a four-vector defined by N a = ( ν , ν n ^ ) {\displaystyle N^{a}=\left(\nu ,\nu {\hat {\mathbf {n} }}\right)} where ν {\displaystyle \nu } is the photon's frequency and n ^ {\displaystyle {\hat {\mathbf {n} }}} is a unit vector in the direction of the photon's motion.

  7. Sennheiser - Wikipedia

    en.wikipedia.org/wiki/Sennheiser

    The Sennheiser Innovation Campus is located at the headquarters in Wedemark near Hanover. A Sennheiser-produced flagship open-back headphone, the HD800S. Sennheiser is headquartered in the municipality of Wedemark, Germany (near Hannover). Its United States headquarters are located in Old Lyme, Connecticut. Sennheiser has a total of 21 sales ...

  8. IQ imbalance - Wikipedia

    en.wikipedia.org/wiki/IQ_imbalance

    IQ imbalance is a performance-limiting issue in the design of a class of radio receivers known as direct conversion receivers. [a] These translate the received radio frequency (RF, or pass-band) signal directly from the carrier frequency to baseband using a single mixing stage.

  9. Frequency response - Wikipedia

    en.wikipedia.org/wiki/Frequency_response

    Magnitude response of a low pass filter with 6 dB per octave or 20 dB per decade roll-off. Measuring the frequency response typically involves exciting the system with an input signal and measuring the resulting output signal, calculating the frequency spectra of the two signals (for example, using the fast Fourier transform for discrete signals), and comparing the spectra to isolate the ...

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