As an omni mic supplier, I often get asked about the maximum sound pressure level (SPL) of our omnidirectional microphones. Understanding this parameter is crucial for anyone looking to capture high - quality audio in various environments, from small meeting rooms to large event spaces.
What is Sound Pressure Level?
Sound pressure level is a measure of the effective pressure of a sound wave relative to a reference value. It is expressed in decibels (dB). The reference value for sound pressure in air is typically (20\ \mu Pa), which is approximately the threshold of human hearing at (1\ kHz).
The SPL of a sound can vary widely depending on its source. For example, a whisper might have an SPL of around (30\ dB), normal conversation is usually in the range of (60 - 70\ dB), and a rock concert can reach SPLs of over (120\ dB). When it comes to microphones, the maximum SPL they can handle is an important specification.
Why Maximum SPL Matters for Omni Mics
Omnidirectional microphones, or omni mics, are designed to pick up sound equally well from all directions. They are commonly used in applications such as conference calls, live events, and audio recording. In these scenarios, the microphone may be exposed to a wide range of sound levels.
If the sound pressure exceeds the maximum SPL that an omni mic can handle, it will result in distortion. Distorted audio is of poor quality and can make it difficult to understand speech or enjoy music. For instance, in a conference call, if the microphone distorts when someone raises their voice, important information may be lost.
Factors Affecting the Maximum SPL of Omni Mics
Several factors influence the maximum SPL of an omni mic:
Diaphragm Design
The diaphragm is the part of the microphone that vibrates in response to sound waves. A more robust diaphragm can withstand higher sound pressures without distorting. Microphones with larger diaphragms generally have a higher maximum SPL because they can handle greater physical stress.
Electronics
The electronic components in the microphone, such as the pre - amplifier, also play a role. High - quality electronics can better handle the electrical signals generated by the diaphragm when exposed to high sound pressures. A well - designed pre - amplifier can amplify the signal without introducing distortion.
Housing and Construction
The physical housing of the microphone can affect its maximum SPL. A sturdy housing can protect the internal components from external vibrations and mechanical stress, which can help maintain the microphone's performance at high sound levels.
Typical Maximum SPL Values for Omni Mics
The maximum SPL of omni mics can vary significantly depending on their design and intended use.
For consumer - grade omni mics, such as those found in some USB microphones, the maximum SPL might be around (110 - 120\ dB). These microphones are suitable for normal conversation and light audio recording. For example, a USB omni mic used for home podcasting or online meetings can handle the typical sound levels in a quiet room without distortion.
Professional - grade omni mics, on the other hand, can have a much higher maximum SPL. Some high - end models can handle SPLs of up to (140\ dB) or more. These microphones are used in demanding environments such as live concerts, large conferences, and outdoor events where the sound levels can be extremely high.
Applications and the Required Maximum SPL
Let's take a look at some common applications and the maximum SPL requirements for omni mics in each:
Conference Rooms
In a typical conference room, the sound levels are usually relatively low. Normal conversation levels in a meeting range from (60 - 70\ dB). However, if there is a large group or someone speaks loudly, the SPL can reach up to (80 - 90\ dB). A consumer - grade omni mic with a maximum SPL of around (110 - 120\ dB) is usually sufficient for most conference room applications. For a more professional setup, you might also consider pairing the omni mic with a Meeting Room USB Camera to enhance the overall meeting experience.
Live Events
Live events, such as concerts and festivals, can have extremely high sound levels. The SPL on a concert stage can easily exceed (120\ dB), especially during the peak moments of a performance. In these cases, professional - grade omni mics with a maximum SPL of (140\ dB) or higher are necessary to capture the audio without distortion.
Outdoor Recording
Outdoor recording can present a wide range of sound levels. For example, in a busy city street, the sound of traffic can reach (80 - 90\ dB), while a passing ambulance siren can be over (120\ dB). An omni mic with a high maximum SPL is needed to handle these fluctuations and ensure high - quality audio recording.
Complementary Products for Audio Setups
In addition to omni mics, we also offer other products that can enhance your audio setup. For example, the Conferencing Wireless Speakerphone 360 Degree Pick - up 12METERS is a great companion for omni mics in conference rooms. It provides clear audio playback and has a 360 - degree sound pickup range, ensuring that everyone in the room can be heard and can hear clearly.
Another option is the Bluetooth Speaker For Phone Calls. This speaker is ideal for mobile users who need to make or receive phone calls in a hands - free manner. It can be paired with an omni mic to create a complete audio solution for on - the - go communication.
Contact Us for Procurement
If you are in the market for high - quality omni mics or any of our complementary audio products, we encourage you to contact us for procurement. Our team of experts can help you select the right products based on your specific needs and budget. Whether you are setting up a small home office or a large conference facility, we have the solutions to meet your audio requirements.
References
- "Microphone Handbook" by Günter Theile
- "Audio Engineering: Principles and Practice" by Glenn Ballou
- IEEE Transactions on Audio, Speech, and Language Processing for technical papers on microphone design and performance.