Estimating TWA from Lavg, Accuracy of Readings

between TWA and Dose is that TWA is expressed in decibels and Dose is expressed as a percent.

TWA is equal to a continuous level which if constant for eight hours would produce the same noise dose as the dose accumulated over the run time. The average integrated sound level (Lavg) will be equal to TWA at eight hours. If the time is less than eight hours, then TWA will be less than Lavg; TWA will be greater than Lavg if time is greater than eight hours.

The M-27 automatically computes the TWA of a worker if the unit is worn by the worker for a full workday. Even if the worker does not work exactly eight hours the TWA measurement will read the correct TWA for that worker.

Lavg can be used with short term sampling to estimate the worker's TWA. If the noise exposure during the sample period is representative of the noise throughout the workday and the workday is eight hours, then the TWA for that worker is equal to the Lavg measured with the short term sample.

Estimating TWA from Lavg

A short term sample can be used to estimate worker exposure even if the workday is other than eight hours by adding or subtracting a correction factor from the Lavg reading.

As an example, if a worker has a Lavg of 85.50 dB after a ten minute sample, and the sample is representative of the noise throughout the workday, and the workday at that position is 7:15 then from Table 4 under a 5 dB exchange rate find -.71 dB and subtract it from 85.50 to compute a TWA of 84.79 dB.

Accuracy of Readings

There is a tendency to overestimate the accuracy of digital readings. In the M-27, some values such as Lavg and TWA are computed to 0.1 dB. The absolute accuracy of the reading is not 0.1 dB. (See specifications for accuracy and tolerances.) However, the resolution of 0.1 dB is useful in determining the sample time required for a short term sample. As an example, if Lavg reading is increasing .3 dB every second then additional sample time may be required. If the Lavg reading remains stable within a few 0.1 dB's then the sample time may be long enough.

Hints and Good Practices

The M-27 is in the pause mode after the battery is replaced, when

M-27 specifications

AudioQuest M-27 is a standout speaker designed for audiophiles who demand high performance and exquisite sound quality. As part of AudioQuest's commitment to providing unparalleled audio experiences, the M-27 blends advanced technologies with premium materials to deliver exceptional musical clarity and accuracy.

One of the key features of the M-27 is its innovative driver design, which utilizes a new-generation ceramic cone. This cone is engineered to minimize distortion while enhancing transient response. The result is a speaker that offers a clear, detailed sound across a wide frequency range. The drivers are also matched with an advanced neodymium magnet system, ensuring efficient energy transfer and improved bass response.

The M-27 is equipped with a sophisticated crossover network that has been meticulously designed to maintain the integrity of the audio signal. By employing high-quality components, including precision resistors and capacitors, the crossover effectively divides the audio signal into specific frequency bands, allowing each driver to perform at its best. This attention to detail not only enhances sound quality but also helps to create a more cohesive listening experience.

Another notable characteristic of the M-27 is its sturdy and well-constructed cabinet. Built from high-density MDF, the cabinet is engineered to minimize resonance and vibration, which can color sound. Moreover, AudioQuest has incorporated internal bracing to further enhance structural integrity. The elegantly finished exterior not only adds to the speaker's aesthetic appeal but also serves to complement various home decors.

Connectivity is made simple with the M-27, thanks to its standard speaker terminals that accommodate a wide range of wire gauges. This flexibility allows audiophiles to use their preferred cables for optimal performance. Additionally, the speaker is designed to work seamlessly with a variety of amplifier configurations, making it an adaptable choice for different audio setups.

Incorporating these advanced technologies and design principles, the AudioQuest M-27 is not just a speaker; it's a gateway to an immersive listening experience. With its ability to reproduce sound with remarkable accuracy, it will appeal to discerning listeners looking to elevate their audio playback and enjoy their favorite music in a whole new light. Overall, the M-27 stands as a testament to AudioQuest's dedication to crafting high-quality audio products that meet the needs of serious music enthusiasts.