Operating Procedure

NOTE

When the unit is off, the battery still powers the memory. If the unit is not going to be used for a few days, the battery should be removed.

Microphone Replacement

The microphone is field replaceable. To unscrew the microphone, grip the knurled nut on the top of the dosimeter and gently turn it counterclockwise. Do not twist or turn the cord or black strain relief. Replace with new microphone and recalibrated unit.

Calibration and Maintenance

The M-27 should maintain its accurate calibration for many months of use. However, to insure consistently accurate operation it is recommended that the unit be returned once a year for a complete checkout and calibration. The calibration standards for the equipment in Quest's laboratory are traceable to the N.I.S.T.

The M-27 should be checked each day before it is used. It is recommended that one of the Quest calibrators be used, with the proper 8 mm microphone adaptor.

Daily Calibration

1.Turn M-27 on and press any key. If LOBAT is displayed, the battery is low and should

bechanged.

2.Turn on the calibrator and check the battery indicator. Replace the battery if required. If the calibrator has multiple frequencies or levels, set it to 1000 Hz. Listen to see if the calibrator is producing a tone.

3.Remove the windscreen from the microphone. Carefully insert the microphone in the microphone adaptor and place the adaptor in the calibrator. Make sure the microphone is inserted all the way in the adaptor and the adaptor rests flush on the inner rim of the calibrator. Turn on the calibrator. If the calibration is done at high altitudes see Altitude Corrections below.

4.Press CODE/HL3 until CAL is displayed. Press SOUND LEVEL. If the level is correct, press PAUSE/RESET until CAL is displayed.

5.If the reading is off slightly, insert a small screwdriver in the hole above CAL and slowly turn the CAL screw until the display reads correctly. Press PAUSE/RESET until CAL is displayed.

6.The M-27 is now calibrated and ready for use.

7.If a calibrator is used at any frequency other than 1000 Hz, then the proper correction for that frequency weighting must be made (see Figure 4).

Altitude Corrections

The effects of atmospheric pressure on the M-27 are negligible. However, calibrator sound levels are affected by pressure and corrections must be made. For the Quest Calibrator the correction is -.1 dB for each 2000 feet above sea level.

As a Personal Noise Dosimeter

1.If display is blank, press ON/OFF to turn unit on.

2.Clear the M-27 memory by pressing and holding down the PAUSE/RESET key until it counts down from P-5 to P-0 and - --.

3.If LOBAT is displayed, replace the battery and continue.

4.	Check the calibration of the unit (see Calibration and Maintenance).
5.	Check CODE to see if correct.

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.

AudioQuest M-27 specifications Operating Procedure

Models: M-27