Microphones Audio Engineering- Updated Question and Answers [100% Correct] 2025 Latest Version

Microphones Audio Engineering- Updated Question and Answers [100% Correct] 2025 Latest Version What is the main difference between a dynamic microphone and a condenser microphone? A dynamic microphone uses an electromagnetic induction principle, while a condenser microphone uses a capacitor to capture sound. Which microphone type is most commonly used in live sound reinforcement? Dynamic microphones are typically preferred for live sound due to their durability and resistance to moisture. What is the purpose of a pop filter in front of a microphone? A pop filter is used to reduce plosive sounds, such as "p" and "b" sounds, which can cause distortion in the audio recording. Why do condenser microphones require a power source? Condenser microphones require a power source (phantom power) to maintain the electrical charge between the diaphragm and the backplate, which is essential for their operation. What is the typical frequency response range of a professional studio condenser microphone? The frequency response range of a high-quality studio condenser microphone typically spans from 20 Hz to 20 kHz. What is the difference between a cardioid and omnidirectional microphone pattern? A cardioid microphone captures sound primarily from the front, while an omnidirectional microphone picks up sound from all directions equally. What is the main advantage of using a ribbon microphone? 1 Ribbon microphones provide a natural, smooth sound with a vintage character, especially good for capturing vocals and acoustic instruments. How does microphone impedance affect its compatibility with audio equipment? Lower-impedance microphones (typically under 600 ohms) are better suited for professional audio equipment, while higher-impedance microphones may be more suitable for consumer-level devices. What is the ideal application of a shotgun microphone? Shotgun microphones are highly directional and ideal for situations where you need to pick up sound from a specific source while rejecting noise from the sides and rear. Why are lavalier microphones often used in film and video production? Lavalier microphones are small, clip-on microphones that provide hands-free operation and are perfect for capturing dialogue in a discreet and portable manner. What does the term "phantom power" refer to in microphone usage? Phantom power is a DC voltage (usually 48V) supplied through the microphone cable to power condenser microphones. How does a high-pass filter benefit microphone recordings? A high-pass filter removes low-frequency noise, such as hum and rumble, ensuring a cleaner, more focused sound from the microphone. What is a common use for a dynamic cardioid microphone in a recording studio? Dynamic cardioid microphones are frequently used for miking loud sound sources, like guitar amps and drums, due to their ability to handle high sound pressure levels. How does the proximity effect influence microphone recordings? The proximity effect causes an increase in bass frequencies as the sound source moves closer to the microphone, commonly seen in directional microphones. 2 What type of microphone is most commonly used for podcasting? Condenser microphones are commonly used for podcasting because of their sensitivity and ability to capture a wide range of frequencies, resulting in clear, high-quality sound. What is the role of a directional microphone in capturing sound? Directional microphones, such as cardioid, supercardioid, and hypercardioid, focus on sound from one direction while rejecting noise from the sides and rear. Why might a sound engineer choose a dynamic microphone for miking drums? Dynamic microphones are favored for drums because they can handle high sound pressure levels and provide durability under intense use. What is a key characteristic of a small diaphragm condenser microphone? Small diaphragm condenser microphones are known for their accuracy and ability to capture detailed high-frequency sounds, making them ideal for capturing instruments like acoustic guitars and cymbals. How can a microphone's polar pattern affect its use in a recording environment? The polar pattern of a microphone determines how it picks up sound from different directions, which influences its suitability for various recording environments and sound sources. What is the purpose of using a shock mount with a microphone? A shock mount isolates the microphone from vibrations and handling noise, preventing unwanted sounds from being transmitted into the recording. What does "self-noise" refer to in microphone specifications? Self-noise refers to the internal noise generated by the microphone's electronic components, which can impact the overall sound quality, especially in quiet environments. What is the benefit of using a stereo pair of microphones for recording? 3 A stereo pair of microphones can capture a more immersive and realistic soundstage, providing a sense of space and depth to the recording. How does an XLR cable differ from a standard 1/4-inch cable in microphone use? XLR cables are used with professional microphones and provide a balanced signal, reducing noise and interference, whereas 1/4-inch cables are typically unbalanced and more prone to signal degradation. What is the significance of a microphone's signal-to-noise ratio? A high signal-to-noise ratio means that the microphone will produce a clearer sound with less unwanted background noise, which is important for high-quality recordings. Why might a sound engineer use a shotgun microphone in a film setting? A shotgun microphone's highly directional pickup pattern makes it ideal for isolating specific sounds in a noisy environment, such as on film sets or in outdoor recording situations. What does a microphone's "sensitivity" rating indicate? A microphone's sensitivity indicates how effectively it converts sound into an electrical signal, with higher sensitivity microphones capturing more detail at lower volumes. What type of microphone is ideal for capturing high-pressure sound levels without distortion? Dynamic microphones are typically ideal for high-pressure sound levels because of their robust design, which helps prevent distortion even in loud environments. What is the purpose of a low-cut filter on a microphone? A low-cut filter helps reduce low-frequency rumble or hum, ensuring a cleaner recording by f iltering out unwanted noise below a certain frequency threshold. How can environmental factors affect the performance of a microphone? Environmental factors like temperature, humidity, and background noise can influence the microphone's performance, leading to issues like condensation inside the mic or increased noise levels. 4 The process by which one form of energy is converted into is called Transduction When applied to microphones, the process converts _____ energy into ________ energy Acoustical / electrical To accomplish this conversion, there are two technologies. One type of microphone, known as a _____ receives incoming sound through its diaphragm and generates a signal using a magnet. The other is known as a ______ microphone, uses and _______ field created by varying distance of a conductive diaphragm from a metal backplate. Dynamic / condenser / electrical There are two categories of dynamic microphones. What are they? Moving-Coil: A coil of wire attached to a diaphragm suspended in a magnetic field. When sound waves vibrate the diaphragm, the coil vibrates in the magnetic field and generates an electrical signal. Ribbon: A thin piece of metal foil is suspended in a magentic field, sound waves vibrate the ribbon in the magetic field, which generates an electrical signal. What is the other name for a condenser and how does it work? Capacitor: A conductive diaphragm with a metal backplate placed close together are charged with static electricity. When the sound wave hits the diaphragm, it vibrates, causing the psace between the plates to vay. The variation of the capacitance generates a signal similar to the incoming sound wave. There are 2 categories of condensers. What are they and how do they function? True Condenser: The diaphragm and backplate are charged with a voltage from a circuit built into the mic. Electret Condenser: The diapragm and backplate are charged by an electret material which in the diaphragm or on the backplate. Between condensers and dynamics, which has the faster transient response and why? Condenser, beacuase the diaphragm weighs less than a dynamic, allowing for the onset of vibration to start faster. 5 All condenser microphones require a power supply to operate. One common method is through the use of ____ ____ which supplies _____ volts across pins 2 and 3 of the microphone connector. Phantom power / 48 The directionality of a microphone refers to its ____ ______. The 3 main types according to coverage are: Polar pattern / omnidirectional / unidirectional / bidirectional There are three categories of unidirectionals. What are they? Hypercardioid Which type of polar pattern has no proximity effect? Cardioid / Supercardioid / Omnidirectional Which polar pattern is used for coincident and near-coincident stereo miking? Which polar pattern inverts polarity relative to its other side? Basic sound quality characteristics for dynamic moving coil: Bidirectional Unidirectional Varies between smooth and rough, limited range Basic sound quality characteristics for dynamic ribbons: highs Basic sound quality characteristics for condensers: Deep lows, flat mids, possible rolled-off Wide and smooth, most have increase in highs A microphone's _________ response refers to the range of frequencies it will reproduce within a tolerance of ______ Frequency / +/- 3dB When recording, a _______ will help tame and remove undesirable low frequencies. These can be found on a microphone's ________, on a console, or within a DAW plugin. High-pass filter / low-cut switch 6 When recording a vocalist, it is necessary to use a ____ ________ to reduce word with plosives Pop filter A ______ peak is a noticeable emphasis of frequencies from 5-10kHz. Presence Impedance is the resistance of a circuit to _____ ________ measured at 1kHz. Low Z refers to _____ ohms and less while High Z refers to ______ ohms and up. Alternating current / 150-600 / 10,000 Historically, the source and the load used _____ impedances of _______ ohms. Today however, nearly all devices are bridging, which results in a maximum voltage transfer from source to load, or ______ out to a ______ in. Matching / 600 / low-z / high-z High-z / DI All electric guitars and bass guitars are _____ sources and require a _____ box in order to maintain signal integrity If a microphone's ____ is exceeded, the microphone will begin to distort at the specified dB. To prevent this from happening, some microphones, particularly condensers, have a _____ that will prevent distortion in the microphone circuitry. Maximum SPL / Pad Switch ____________ is a microphone spec that indicates how much voltage a mic produces when driven by a certain SPL. When the value is high, a microphone will put out a stronger signal than when it is low when both are capturing an equally loud signal. Sensitivity Sensitivity specs from low to high: Ribbon, Dynamic, Condenser ____ is the ratio in dB between signal voltage and noise voltage. The ____ the number, the better, meaning lower noise. Signal to Noise / higher ____-____ is the noise voltage a microphone produces, equivalent to what the mic produces from a given dB SPL. The _____ the dB spec, the quieter the microphone is. Microphone wiring: 1= ground, 2= hot, 3= cold Self-noise / lower 7 __________ is considered any unwanted sound from instruments other than the one at which the microphone is aimed. Leakage ________ is the inherent acoustical room tone consisting of early and later reflections 8 Methods of reducing leakage: Mike each instrument closely Overdub each instrument one at a time Record directly through pickups HIgh pass filters / low pass filters / EQs Use directional mics instead of omni mics Record in a large, dead studio Put portable wall between instruments Use noise gates on drum tracks Which microphone type would be best for environments surrounded by hard surfaces? microphones What is the 3-1 rule? Ambience Boundary Spacing the microphones at least three times the mic-to-source distance. ______ ________ _______ can capture sound of a musical group as a whole, using 2 or 3 microphones. Stereo microphone techniques Three coincident pair stereo mic techniques are: _____, _____, and _____ ______. They are 'coincidental' because each mic receives sound from the source simultaneously while the amplitude of the source varies. Coincidental miking angles will vary from ___ to _____ degrees. XY / Blumlein / Mid Side / 90 / 120 The "crossed pair of figure of eights" is the earliest of the XY techniques, and is configured with the two bidirectional microphones oriented at an angle of 90 degrees. It was developed in the _________ by British scientist ____ _____ and consequently known as the ______ array. Typically, this technique works 8 1930s / Alan Blumlein / Blumlein / well in a ____ room or one with minimal side-wall reflections. Wide A recording consisting of a coincident microphone technique will be ______ _______. compatable Mono The mid-side technique incorporates use of a _____ (polar pattern) microphone for the mid-component which is aimed directly at the _________. Additionally, a ______ microphone consists of a side component, oriented _______ with the ____ plane. Cardioid / Center line / figure-8 / laterally / null Near-Coincident techniques give stereo impression based on differences in _____ and _____. One advantage is they offer good ________. Two techniques of this type are ____, _______. Intensity / Time / Localization / ORTF / NOS What does ORTF stand for? What does NOS stand for? Office de Radiodiffusion Télévision Française Nederlandse Omroep Stichting ORTF's configuration consists of two ______ microphones oriented outward from the centerline with an angle of ____ degrees and a capsule spacing of _____ cm, or ____ inches Cardioid / 110 / 17 / 6.75 NOS's configuration consists of two ______ microphones oriented outward from the centerline with an angle of ____ degrees and a capsule spacing of _____ cm, or ____ inches 7/8ths Cardioid / 90 / 30 / 11 & A microphone's _____ ______ is a graphical representation using concentric circles in 5dB increments that shows a microphone's sensitivity versus the angle at which sound is picked up. Polar pattern The _____ _______ stereo technique creates the most undesirable phase anomalies. Spaced pair 9 According to Streicher and Dooley, the mid-side stereo technique offers several advantages to the engineer. 1) it is phase ______, 2) It is ______ compatible, 3) the stereo_______ can be controlled and 4) it does not require the use of a ______ pair of microphones and different brands can be combined Coherent / mono / width / matched A-B stereo technique is also called ____ _____ because while there is minimal time phase difference between the capsules for sound sources on the horizontal plane, it relies solely on the intensity differences between the two signals for directional cues. Intensity stereo A _______ recording is a technique intended for playback through headphones. It is configured with two ________ microphones placed into the ears of a _______ ________ to simulate the sound received at the ears of the listener. Binaural / omnidirectional / dummy head The result of matrixing a mid-side technique = mid+side = ______ and mid-side = ______. right Left / Created in 1954 by ____ ______ of Decca Records, the technique known as the ____ ______ was created using three ________ microphones. Original spacing between the left and right microphones was ___ meters, or ____ ft/inches. The array was placed about ___ to _____ feet above the conductor's head. Roy Wallace / Decca Tree / omnidirectional / 2 / 6ft. 6.75in. / 1.5 / 4ft. 11in. / 8-10 Typical applications of dynamic moving coils Typical applications of condensers Drums and guitar amps. Acoustic instruments, cymbals, and studio vocals. Typical applications of dynamic ribbons Horns and guitar amps. Sound entering a microphone other than 0 degrees relative to the diaphragm is called: off-axis 10