Solid State Logic AWS 900 Calibration Manual

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AWS 900 Calibration Tutorial

Calibration Tutorial

Introduction

The monitor calibration system on the AWS 900 console enables the level of any loudspeaker connected to the

AWS 900 to be trimmed by ±10dB. This allows for quick and easy calibration without having to physically alter

settings on the individual loudspeakers. Calibration is important so that each loudspeaker will produce the

same level of sound, and for setting reference monitoring levels. Note that with the monitor gain at maximum a

trim level of +10dB corresponds to unity gain through the monitor section.

Note: Do not attempt to carry out loudspeaker calibration unless you have accurately calibrated test equipment.

Sound Level Meter Set up

Position your Sound Level Meter (SLM) on a microphone stand for maximum stability and for the least

interference from the operator. Set the level to 80dB, C Weighting with a slow response. When calibrating, a

recommended level of 85dB C is required for each loudspeaker.

Reference Level: A reference value of 85dB is the Dolby Reference level used in movie theatres and movie

presentations. This level was set by the SMPTE (Society of Motion Pictures and Television) organisation to

ensure and achieve repeatable results of a finished product for cinema post-production work. For more

information on Dolby and for speaker setups, please visit their website at: http://www.dolby.com.

C Weighting: Human hearing sensitivity varies with frequency, which can be shown with loudness curves –

please visit

http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

and click on

Sound and Hearing>Sound

Level Measurement>Ear's Response Curves

for graphs and detailed descriptions. Sound Pressure Level

meters have different filter contours, or weightings, corresponding to the loudness curves of the ear. The

different contours are intended to match the ear at different sound intensities. C-Weighted curves are used for

high sound levels, and corresponds to the 100 phon loudness curve (see link above). This filter contour doesn't

filter out as much of the low or high end of the spectrum when compared to the other filter contours (A and B

weighting) – please visit

http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

and click on

Sound and

Hearing>Sound Level Measurement>Filter Contours A, B, C

for graphs of the filters and detailed descriptions.

Figure 1 - Sound Level Meter

Place the SLM on its stand in the position where the sound engineer would sit at the console, at head height.

Point the SLM in the direction of the loudspeaker you are calibrating. See figure 2 for position.

AWS 900 Tutorials

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Page 1 The monitor calibration system on the AWS 900 console enables the level of any loudspeaker connected to the AWS 900 to be trimmed by ±10dB. This allows for quick and easy calibration without having to physically alter settings on the individual loudspeakers. Calibration is important so that each loudspeaker will produce the same level of sound, and for setting reference monitoring levels.
Page 2 AWS 900 Calibration Tutorial Figure 2 – Room Set up Adjusting each loudspeaker with the AWS 900 Turn on the console oscillator OSC ON and select the pink noise PINK ON; the default for the console's pink noise output is +4dBu RMS. Adjust using the Pink trim pot in the oscillator section if necessary (see Figure 3).
Page 3 AWS 900 Calibration Tutorial Now select the required monitor system – Main 5.1 (no selection), Alternate 5.1 (ALT 5.1), Mini A or Mini B. Figure 5 – Monitor System LCR Adjustment To enter the calibration menus, press Monitor Options button in the Monitor Control Section, and then the Cal...
Page 4 AWS 900 Calibration Tutorial Surround Channel Adjustment By pressing the NEXT button, you will enter the second calibration menu. By pressing ALS or ARS you can adjust the left surround loudspeaker or right surround loudspeaker respectively. Figure 8– Second Calibration Menu Subwoofer Adjustment By pressing ALF you can adjust the Subwoofer loudspeaker.
Page 5 AWS 900 Calibration Tutorial Figure 10– Low Frequency Gain AWS 900 Tutorials...

Solid State Logic AWS 900 Calibration Manual

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Introduction

Sound Level Meter Set up

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