Elliot Kim
Ribbon microphones are known for their distinctive sound, which is due in part to their figure-8 polar pattern. They are bidirectional, picking up sound from the front and back while rejecting sound from the sides. Ribbon mics have a greater sensitivity to low frequencies, resulting in a smooth roll-off with decreased output at high frequencies. This gives them a darker sound compared to other microphones. Ribbon mics also exhibit a proximity effect, with a more pronounced bass response when placed closer to the sound source. To capture the full low-end sound of a ribbon mic, a high-quality preamp with high input impedance is required. Ribbon mics are versatile and can be used for a variety of applications, from recording instruments and vocals to capturing the ambience of a room.
| Characteristics | Values |
|---|---|
| Ribbon mics' sound quality | Dark and quiet |
| Ribbon mics' output level | Lower than contemporary condenser mics |
| Ribbon mics' sensitivity | More sensitive to input impedance |
| Ribbon mics' frequency range | Lower frequencies affect ribbon mics more than higher frequencies |
| Ribbon mics' EQ | Takes EQ well |
| Ribbon mics' polar pattern | Bidirectional (figure-8) |
| Ribbon mics' sound | Warm |
| Ribbon mics' high-frequency response | Limited compared to capacitor mics |
| Ribbon mics' bass response | More bass when closer to the source |
| Ribbon mics' preamp | Requires a high-quality preamp with high input impedance |
| Ribbon mics' cables | Require high-quality cables to minimize signal loss |
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What You'll Learn
Ribbon mics have a distinctive sound
Ribbon microphones have a distinctive sound that sets them apart from other types of microphones. They are known for their ability to capture high-frequency details and subtle nuances, making them a popular choice for vocal recordings and delicate instruments. The sound produced by ribbon mics is often described as warm, smooth, and natural.
One of the unique characteristics of ribbon mics is their bidirectional pick-up pattern. This means that they capture sound equally from the front and back while rejecting sound from the sides. This feature provides amazing spatial precision and depth to recordings, making them ideal for use in controlled studio environments. Additionally, their figure-8 polar pattern allows for versatile applications, such as capturing both sides of a conversation or blocking out unwanted sounds.
The distinctive sound of ribbon microphones is also influenced by their sensitivity to input impedance. Classic ribbon mics have a lower output level compared to contemporary condenser mics, and their greater sensitivity can result in a darker sound. Lower frequencies tend to affect ribbon mics more than higher frequencies, leading to a smooth roll-off at high frequencies. However, this also means that ribbon mics respond exceptionally well to EQ adjustments, allowing for easy enhancement of high frequencies.
The design of ribbon mics contributes significantly to their unique sound. Ribbon microphones feature a thin metal ribbon, typically made of aluminium, suspended in a strong magnetic field. This lightweight ribbon vibrates in response to sound waves, converting those vibrations into electrical signals. The ribbon's low tension and resonant frequency below the range of human hearing contribute to the mic's excellent frequency response and distinctive sound.
While ribbon microphones have traditionally been delicate and fragile, modern materials and advancements have made them more durable. This has expanded their use in loud music and stage performances, showcasing their versatility and ability to capture a wide range of sounds with their distinctive and sought-after qualities.
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They are ideal for miking guitar cabinets
Ribbon microphones are ideal for miking guitar cabinets. They are the preferred choice of many engineers when recording bass and electric guitar amps. The low-end proximity effect inherent in ribbon mics can enhance the lows of an amp, while the extended highs of the mics provide balance to that end of the frequency spectrum. Ribbon mics can smooth out the cutting midrange of overdriven amps while still imparting a low-mid punch that yields a powerful tone.
The balanced frequency response of ribbon microphones generally means that there is no need to blend additional mic signals to achieve a full, complete sound. When positioning a ribbon mic on an amp, it is recommended to first try orienting the mic facing the amp straight-on. This position will produce the most accurate, balanced frequency response. If you find that the proximity effect of the microphone creates too much low-end, you can try angling the mic so that the ribbon is no longer parallel to the amp face. This will reduce the low-end proximity effect while retaining the extended top-end of the ribbon.
It is important to note that ribbon microphones are sensitive instruments and require careful handling. To ensure that the ribbon is not damaged by strong blasts of air from an amp, it is recommended to place your hand near the amp grill and move it away until you can no longer feel moving air, then place the microphone in that position. Additionally, you can tilt the ribbon slightly upward, relieving the ribbon of some tension and allowing it to withstand more impact from air.
Ribbon mics also require high-quality cables to minimize signal loss. High resistance or high capacitance "economy" cables can significantly degrade the performance of ribbon microphones. Shorted cables or poorly wired connectors can send phantom power current to the ribbon element, potentially resulting in a blown ribbon.
Overall, ribbon microphones offer distinct advantages for miking guitar cabinets, providing a full and balanced sound while requiring minimal additional signal blending. With careful handling and the use of high-quality cables, ribbon mics can deliver exceptional results in guitar cabinet microphone applications.
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Ribbon mics are bidirectional
Ribbon microphones are velocity microphones that use a membrane of extremely thin metal suspended in a strong magnetic field. They are called velocity microphones because the induced voltage is proportional to the velocity of the ribbon and thus of the air particles in the sound wave. Ribbon mics are also called passive devices because they have no onboard active electronics or preamplification.
Unless designed otherwise, all ribbon mics are naturally bidirectional, giving them a figure-8 polar pattern. This means that sound waves arriving from the side of the thin ribbon element won't cause it to move because the pressure on both sides of the ribbon is identical. This makes ribbon mics ideal for miking guitar cabinets or choirs in large spaces, where the sound level entering the back of the microphone is far lower than in the front.
The applications for this figure-8 directionality are endless. For instance, ribbon mics were longtime favorites of radio and television talk-show hosts because a single mic could capture both sides of a conversation, while the mic’s sides could be pointed at the audience, the equipment, or the band to block out unwanted sounds. Ribbon mics can also be configured to have cardioid, hypercardioid, and variable pattern.
The bidirectional nature of ribbon mics also has some drawbacks. For example, when recording cabs with a bidirectional ribbon mic, the mic will pick up reflections from behind that may be unwanted. However, this issue can be mitigated by placing a large gobo (with rock wool or Owens) on the back and sides of the mic to stop early reflections.
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They are more sensitive to input impedance
Ribbon microphones are known for their sensitivity to input impedance. This sensitivity can impact the overall performance and sound quality of the microphone.
Input impedance refers to the opposition that a circuit presents to an electric current when a voltage is applied. In the context of ribbon microphones, the impedance of the preamp or audio interface can significantly affect the sound and performance of the microphone.
Passive ribbon microphones, in particular, must be properly mated to the input impedance of the preamp to function optimally. If the preamp's impedance is too low, the microphone will struggle to generate a strong signal, leading to a degradation in performance. Specifically, the low-end response of the microphone may be limited, resulting in a dull and flat sound.
To capture the full sonic potential of a ribbon microphone, it is essential to ensure that the preamp's input impedance is high enough. The general rule is that the preamp's input impedance should be at least four to five times higher than the output impedance of the microphone. This ensures that the microphone can move freely and generate a strong signal without being damped or restricted.
By selecting a preamp with a suitable input impedance, users can unlock the full range of sounds and tones that ribbon microphones are capable of producing. This includes capturing the tremendous low-end sound that ribbon microphones are known for, as well as enhancing the high-end frequencies.
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Ribbon mics have a high-frequency roll-off
Ribbon microphones have a high-frequency roll-off, which means that they are less sensitive to higher frequencies. This is due to the way ribbon mics react to waveforms of different frequencies. Lower frequencies affect ribbon mics more than higher frequencies, resulting in a smooth roll-off with decreased output at high frequencies where the waveforms are proportionately shorter. This high-frequency roll-off is similar to how human ears perceive sounds, making ribbon mics sound very natural and warm.
The high-frequency roll-off of ribbon mics is one of the reasons why they are often preferred for recording musical instruments and vocals. For example, when used with woodwind instruments such as saxophones, clarinets, and oboes, ribbon mics capture the tonal sweet spot without picking up mechanical noise from the keys and pads. Similarly, for brass instruments like trumpets and trombones, ribbon mics capture the warmth of the instrument without harshness or stridency when musicians play very loudly.
Ribbon mics are also ideal for recording guitar cabinets, as they smooth out the cutting midrange of overdriven amps while still imparting a low-mid punch that yields a powerful tone. The proximity effect of ribbon mics, where the bass response increases as the mic gets closer to the sound source, further enhances the low-end sound. This effect is desirable for radio announcers as it gives their voices a deep, rich quality.
To capture the full low-end sound of ribbon mics, it is important to use a preamp with a high enough impedance. Ribbon mics, especially passive varieties, require a preamp with a high input impedance to reproduce the full range of frequencies that the mic captures. A standard preamp with an input impedance of 1.2k ohms or lower will not be able to record the genuine low-end inherent in ribbon microphones. Therefore, it is recommended to use preamps with input impedances of 9k or higher for optimal results.
Overall, the high-frequency roll-off of ribbon mics contributes to their unique sound and makes them a popular choice for musicians and recording engineers seeking to capture the natural warmth of their instruments and voices.
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Frequently asked questions
Yes, ribbon mics are known for their ability to capture low-end sound exceptionally well. Their frequency response and sensitivity to low-end frequencies make them ideal for capturing the natural sound of instruments and voices.
Ribbon mics have a figure-8 polar pattern, meaning they pick up sound from the front and back while rejecting sound from the sides. This directional pattern enhances low-frequency capture and results in a warm and natural sound.
The proximity effect is more pronounced in ribbon mics. As the mic moves closer to the sound source, there is a significant bass rise, enhancing the low-end capture and resulting in a warmer sound.
Yes, it is important to use high-quality cables to minimize signal loss. Additionally, the choice of preamp is crucial; a preamp with a high input impedance is necessary to capture the full low-end capabilities of ribbon mics.
Ribbon mics are excellent for recording musical instruments, particularly woodwinds, brass instruments, and guitars, as they capture the tonal nuances without picking up unwanted mechanical noise. They are also ideal for radio and television broadcasting, as they can provide a rich, warm sound.
