The Ultimate Quiz On Microphone

The proximity effect refers to the phenomenon where the bass frequencies are emphasized when a microphone is moved closer to the sound source. This occurs because the microphone picks up more of the low-frequency sound waves when it is in close proximity to the source. As a result, there is an apparent boost in the bass response, which is characteristic of the proximity effect.

Standard phantom power is typically provided at 48 volts DC. Phantom power is used to provide power to condenser microphones and other audio devices that require external power to operate. This 48 volts DC power is sent through the microphone cable to power the device, allowing it to function properly.

A polar pattern graph is used to show the directional characteristics of a microphone. It displays how the microphone picks up sound from different directions, indicating its sensitivity and rejection angles. This graph helps in understanding the microphone's ability to capture sound from specific angles and reject sound from other directions. It provides valuable information for choosing the right microphone for specific recording situations and helps in achieving desired sound capture results.

A condenser microphone's operation is based on capacitance. A condenser microphone, also known as a capacitor microphone, consists of a diaphragm that acts as one plate of a capacitor and a backplate that acts as the other plate. When sound waves hit the diaphragm, it vibrates, causing the distance between the plates to change, which in turn changes the capacitance. This variation in capacitance is then converted into an electrical signal, allowing the microphone to capture and transmit sound.

The polar pattern that would be considered undirectional (one direction) is the cardioid pattern. This pattern is named after its heart-shaped pattern, and it is characterized by picking up sound primarily from the front while rejecting sound from the back and sides. This makes it ideal for capturing sound from a specific source or direction, such as a solo performer on stage or a presenter at a conference.

Omni Directional Microphones are equally sensitive to all sound sources, regardless of their relative direction. This means that the microphone will pick up sounds from all directions with equal sensitivity. It does not matter if the sound is coming from in front, behind, or to the sides of the microphone, it will capture it with the same level of sensitivity. This makes omni directional microphones useful in situations where capturing sound from all directions is important, such as recording ambient sound or in conference settings where multiple speakers are present.

A Moving Coil Microphone works by having a mylar diaphragm attached to a coil of wire. This coil of wire is suspended within a magnetic field. When there are changes in air pressure, the mylar diaphragm vibrates, causing the coil of wire to also vibrate. This vibration within the magnetic field generates an electrical signal, which can then be converted into sound. Therefore, the correct answer is a mylar diaphragm which is attached to a coil of wire suspended within a magnetic field that vibrates in response to air pressure changes.

In a noisy environment, the best pick-up pattern to choose is the cardioid pattern. The cardioid pattern is most sensitive to sound coming from the front of the microphone and rejects sound from the sides and rear. This allows the microphone to focus on capturing the performance while minimizing the pickup of surrounding noise.

A direct box is a device used to convert a high impedance signal, such as the output of an electric guitar or a keyboard, into a low impedance signal that can be easily connected to a mixing console or audio interface. This conversion helps in preventing signal loss, noise, and interference, ensuring a clean and balanced audio signal. By converting the high impedance signal to low impedance, the direct box allows for better compatibility and optimal signal transfer between different audio equipment.

Moving the mic farther away from the cabinet would create more room sound when recording a bass guitar. By increasing the distance between the mic and the cabinet, the mic captures more of the natural reverb and ambience of the room, resulting in a more spacious and open sound. This technique is commonly used to add depth and dimension to recordings, especially for instruments like bass guitar that benefit from a fuller sound.

Moving coil microphones are generally used for live concert performances because they are durable, can handle high sound pressure levels, and have a good off-axis rejection. They are also less sensitive to moisture and humidity, making them suitable for outdoor performances. Additionally, moving coil microphones have a warm and natural sound, which is desirable for capturing live music performances.

A dual diaphragm condenser microphone is able to produce selectable polar responses by changing the polarity and voltage relationships between the two diaphragms. This means that the microphone can adjust the electrical signals produced by each diaphragm, allowing for different polar patterns to be achieved. By altering the relationship between the diaphragms, the microphone can capture sound from different directions, such as omnidirectional, cardioid, or figure-eight patterns. This flexibility in polar response makes the microphone versatile and suitable for various recording situations.

Moving the mic towards the center of the speaker cone will result in a brighter sound when recording an electric guitar cabinet. This is because the center of the cone produces a more focused and direct sound, which tends to have more high-frequency content. By positioning the mic in this area, it captures more of the high frequencies, resulting in a brighter overall tone.

A bass roll-off filter on a microphone is used to reduce proximity issues, which occur when the microphone is too close to the sound source and causes excessive low-frequency buildup. It also helps to cut down on plosives, which are sudden bursts of air that can cause distortion in the microphone. Additionally, the filter helps minimize transmission noise, which can be caused by interference or electrical disturbances. Overall, using a bass roll-off filter on a microphone helps to improve the clarity and quality of the recorded or transmitted audio.

The correct answer is "moving coil, cardioid, front address mic." This means that the Sennheiser MD421 is a microphone that uses a moving coil as its transducer, has a cardioid polar pattern (meaning it picks up sound mainly from the front and rejects sound from the sides and rear), and is designed to be addressed from the front.

A figure 8 microphone, also known as a bidirectional microphone, has good side rejection and even frequency response. This type of microphone is designed to pick up sound from the front and back while rejecting sound from the sides. It is shaped like the number 8, with two distinct pickup patterns facing opposite directions. This allows the microphone to capture sound sources directly in front and behind it, while minimizing sound from the sides. The even frequency response ensures that the microphone reproduces sound accurately across the entire audible range.

When the rear/side ports of a cardioid microphone are closed, it becomes omnidirectional. A cardioid microphone is designed to mainly pick up sound from the front and reject sound from the rear and sides. However, when the rear/side ports are closed, it allows sound to enter from all directions, making it omnidirectional. This means that the microphone will pick up sound equally from all directions, resulting in a more versatile and all-encompassing recording or amplification of sound.

The correct answer is that an electret condenser microphone has a diaphragm which is permanently charged. This means that it does not require an external power supply or phantom power to polarize the plates of the diaphragm. The diaphragm of an electret condenser microphone is made of a material that is permanently polarized and retains its charge, allowing it to generate an electrical signal without the need for additional power.

The M 88 microphone has a Hypercardioid polar response.

The AKG C480B microphone has a pad at -10dB and +3dB. This means that it can attenuate the input signal by 10dB or boost it by 3dB. The pad is useful in situations where the input signal is too strong and needs to be reduced to prevent distortion or clipping. On the other hand, the +3dB boost can be used to compensate for low-level signals or to add some extra gain when needed.

The SE SE1A is a small diaphragm, front address, cardioid, condenser mic. This means that it has a small diaphragm, which allows for accurate and detailed sound reproduction. It is a front address mic, meaning that the sound is captured from the front of the microphone. It has a cardioid polar pattern, which means that it picks up sound primarily from the front and rejects sound from the sides and rear. Finally, it is a condenser mic, which means that it uses a capacitor to convert sound waves into electrical signals.

Front to back discrimination refers to the specification that shows how well a directional microphone can reject sound from the rear while capturing sound from the front. It measures the microphone's ability to minimize sound pickup from behind, ensuring that the desired sound source in front is captured with greater clarity and minimal interference from surrounding noise. This specification is particularly important in scenarios where the microphone needs to focus on a specific sound source while minimizing background noise.

The C480 B would be the best choice for a hi-hat because it is specifically designed for capturing high-frequency sounds with clarity and precision. This microphone is known for its excellent transient response and extended frequency range, making it ideal for capturing the subtle nuances and fast attack of hi-hat cymbals. Additionally, the C480 B is a versatile microphone that can handle high sound pressure levels, ensuring that it can accurately capture the dynamic range of the hi-hat without distortion.

The sensitivity spec that reveals the most sensitive mic is -32dB RE 1V @ .1Pa. Sensitivity refers to how effectively a microphone converts sound waves into electrical signals. A lower dB value indicates higher sensitivity, meaning that the microphone can pick up even faint sounds. In this case, -32dB is lower than the other options, indicating that it is the most sensitive microphone. The .1Pa value represents the sound pressure level required for the microphone to produce a 1V output, further emphasizing its sensitivity.

Piezoelectric and condenser microphones require phantom power to function properly. Phantom power is a method of supplying power to microphones through the audio cables, typically using +48 volts. This power is necessary for the operation of condenser microphones, which use an internal capacitor to convert sound waves into electrical signals. Piezoelectric microphones also require phantom power because they rely on the piezoelectric effect, where pressure on certain materials generates an electrical charge. Without phantom power, these microphones will not receive the necessary power to produce sound signals and will not work.

Dynamic microphones are known for their durability, ability to handle high sound pressure levels, and relatively low cost, making them well-suited for the demands of live stage performances.

 Shotgun microphones have a highly directional pickup pattern, meaning they are most sensitive to sounds coming from directly in front of them and effectively reject sounds from the sides and rear. This makes them ideal for isolating a sound source in a noisy environment.