User manual MERIDIAN AUDIO G68 INSTALLATION GUIDE

[. . . ] G68 Digital Surround Controller Installation Guide ii Preface Important safety instructions · Read the instructions. · Do not use this apparatus near water. · Install only in accordance with the manufacturer's instructions. · Refer all servicing to approved service personnel. To avoid interference Do not position the product: · Near strong magnetic radiation, such as near a power amplifier. [. . . ] Units for displaying and entering distances. Reduces the bass to compensate for listening positions close to a wall. Separation between rear speakers. 34 Configuring the digital surround controller 35 Calibrating the system Calibrating the system To help you to set up the installation to give the best possible sound with any particular combination of associated equipment, the G68 Digital Surround Controller includes a built-in calibration procedure. This calibration procedure uses test signals to present a series of sounds, which you use to adjust certain aspects of the system to their optimum settings. You should use the calibration procedure the first time you set up the system, and whenever you want to check the calibration, such as after changing the layout of the room. Introduction We recommend that you perform the calibration procedure using the MSR+ and from the listening position. As you run the calibration procedure the name of each calibration test is shown on the front-panel display, followed by the parameters adjusted in the test. Each calibration test uses a test signal designed to give the best results. Using a Sound Pressure Level meter Although you can perform the calibration procedure by ear, it is recommended that you perform the tests using a Sound Pressure Level meter. These are available fairly cheaply from Tandy/Radio Shack, or your Meridian dealer may be able to lend you one. Set the Sound Pressure Level meter to C weighted, and Slow. Take readings with the meter at the listening position, pointing vertically. You should hold the meter with an outstretched arm to minimise reflections from your body. You can choose to display and enter distances in either feet and inches or metres. 36 Calibrating the system To start the calibration procedure For more detailed information about this and the other calibration tests see the following sections. To exit from the calibration procedure You can exit from the calibration procedure at any time, and any parameters you have set will be retained: · Press On/Off. To complete the calibration procedure If the product is locked the display shows: When you reach the end of the calibration procedure the following display confirms that you have completed the calibration of the system: Version Unlock Calibration complete. Either: · Press Next on the last option of configuring settings; see page 32. Or: · Press On/Off to put the digital surround controller into standby. · Press More. · Press Unlock. The display shows: Back Next Restart · Press Restart to restart the calibration procedure, or Next to complete the wizard. Version Wizard Calib Lock The display shows: Press More for help · Press Calib. The displays shows Please wait. . . . Wizard complete Back Exit Restart Either: After a few seconds the display shows the first calibration test: Press More for help · Press Exit to return to standby. Left ìî Level ïñ +0. 0dB óòô öõú Or: · Press Restart to return to stage 1; see page 26. 37 Calibrating Calibration tests 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 the system · 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: Sub Centre Left ìî Level ïñ +0. 0dB óòô öõú · 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. For correct THX reproduction you should adjust each speaker to 75dB SPL using an SPL meter. [. . . ] Otherwise, it is recommended that you unplug and reconnect the plugs at least once a year. A proprietary contact cleaner can be used to some advantage. The electrical digital output should be treated in a similar way. To change the mains fuse · Remove the mains connector, and pull out the drawer above the power input to access the fuse. [. . . ]