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The proximity effect in audio is an increase in bass or low frequency response when a sound source is close to a directional or cardioid microphone. [1] [2] Proximity effect is a change in the frequency response of a directional pattern microphone that results in an emphasis on lower frequencies. It is caused by the use of ports to create ...
At a distance of about 50 cm (0.5 m) the time delay for a signal reaching first one and then the other microphone from the side is approximately 1.5 ms (1 to 2 ms). If the distance is increased between the microphones it effectively decreases the pickup angle.
The microphone's proximity effect is adjusted so that flat frequency response is achieved for sound sources very close to the front of the mic – typically 1 to 3 cm. Sounds arriving from other angles are subject to steep midrange and bass rolloff.
The Beta 58A has a frequency response extending from 50 to 16,000 Hz, with frequencies attenuated below 500 Hz to counter the proximity effect. [6] [1] It has two high frequency presence peaks, one at 4 kHz and another at 10 kHz. [1] The Beta 58A also features a supercardioid pick-up pattern for better sound rejection from the sides. [7]
Its lower sensitivity requires higher gain from the mic preamp, or an inline gain booster. [19] Podcasting became popular around 2005, often recording at home. The early podcasters used broadcast microphones of proven designs, such as the Shure SM7B and the RE20 family. The EV RE320 began to grow in popularity because of its lower price.
The Shure SM58 is a professional cardioid dynamic microphone, commonly used in live vocal applications. Produced since 1966 by Shure Incorporated , it has built a reputation among musicians for its durability and sound, and is still the industry standard for live vocal performance microphones.
Here, the still-mic-level signal enters into a microphone preamplifier, which boosts the signal voltage to line level. For this example, the microphone preamplifier is built into a mixing board. It is typical for a mixing board to include a line trim after the preamplifier. This allows the amplitude of the now line-level signal to be adjusted.
With this technique is the angle between the microphone axes α = ± 55° = 110° and the distance between the cardioid microphones (microphone basis) is in this case a = 17 cm and gives a total recording angle of 96°. The choice between one and the other depends on the recording angle of the microphone system and not on the distance to and ...