Madrigal Imaging AVP2 owner manual Save ALL Your Changes and Return to the SET Speakers Menu

set levels

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set levels menu

4SAVE ALL YOUR CHANGES AND RETURN TO THE SET SPEAKERS MENU

Once you have each channel adjusted properly, press menu to return to the set speakers menu so you can continue the initial setup of your system.

The AVP2 incorporates level controls for each channel. These allow you to com- pensate for differences in amplifier and speaker sensitivities, and for placement variations in different rooms. These adjustments are essential for reproduc- ing proper soundstaging and image localization. Fortunately, they are nor- mally a onetime adjustment during setup, and only need to be revisited if ampli- fiers or speakers change.

The simplest and best way to adjust the output level controls is by using an Sound Pressure Level (SPL) meter and the internal test tone generator. The goal is to set the volume at the primary listening position to read 75 dB SPL (C-weight- ing, slow response mode) from each speaker in sequence, using the individual output level controls. An appropriate SPL meter can be purchased from Radio Shack for about $35 U.S. (tip: buy the analog meter rather than the digital one). You should point the meter at the ceiling in order to avoid inadvertently favoring one speaker over another.

In the absence of an SPL meter, it is possible (though less desirable) to set the output level controls by ear. Use the built-in pink noise generator in the AVP2 to adjust all volumes to sound the same as they cycle around the various speakers. (This signal uses bandwidth-limited pink noise to limit the problem of timbre shifts between speakers influencing the setting of levels.) The system will then be rea- sonably well balanced, although of course it is not “calibrated.” We urge you to use an SPL meter as soon as practical.

1ENTER THE SET LEVELS MENU

Select set levels in the set speakers menu and press enter. You will then see a screen which should look something like the following:

SET LEVELS

LEFT: 0.0 dB

CENTER: 0.0 dB

RIGHT: 0.0 dB

RIGHT BACK: 0.0 dB

R SURROUND: 0.0 dB

L SURROUND: 0.0 dB

LEFT BACK: 0.0 dB

SUB: 0.0 dB

As with the Set Distance menu, the Set Levels menu is dynamically updated to reflect the choices you have made in the Set Configurations menu. For example, Dual Drive speakers are sent identical amplitude signals to both front and rear halves during calibration, avoiding the need for separate cali- bration.

2RAISE OR LOWER THE LEFT FRONT SPEAKER’S VOLUME TO 75 DB SPL AS MEASURED AT THE PRIMARY LISTENING POSITION

Select the left front speaker by moving the cursor to that line; you can then modify the setting by pressing enter. Use volume ± to adjust the volume of that particular channel. Remember that you should be using the “C” weight- ing curve and the “Slow” ballistics of the SPL meter in order to get an accu- rate reading. Save your change by pressing enter again.