Meridian Audio G68 manual Calibration tests, Levels, Distance

Calibration tests

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C a l i b r a t i n g t h e s y s t e m

Levels

These tests allow you to adjust the output level to each speaker individually, and it follows the general guidelines from Dolby Laboratories and THX.

In each test the display shows the speaker being tested, and the current relative level. For example:

Press More for help

Left Level +0.0dB

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•Use > and < to move between each of the speakers in the layout in the sequence: Left, Centre, Right, Side R, Rear R, Rear L, Side L, and subwoofers.

•Use A and V to adjust the level of the speaker. Ignore any tonal difference.

For correct THX reproduction you should adjust each speaker to 75dB SPL using an SPL meter. Even if the speakers are not THX approved this setting is recommended.

If you have Meridian DSP loudspeakers they cannot be set above +0dB.

•When you have completed the Levels section press > to proceed to the next test.

Distance

These tests allow you to adjust the delay of each of the speakers in the layout to time-align the system so that sounds are coincident when they arrive at the listening position.

Before setting up the speaker outputs you need to measure the distance to each speaker from the listening position:

Left Sub Centre Right

Left	Right
Side	Side

Left Rear Surround Sub Right Rear

Note: You cannot set the level of a subwoofer by ear, because low-frequency noises sound quieter. To set the subwoofer correctly either use an SPL meter, or set it by ear and then reduce the subwoofer gain by 15dB to correct for human hearing.

Measure from ear height at the listening position to the tweeter on each speaker (where applicable), in the distance units you have chosen; see Settings, page 33.