User manual MERIDIAN G68SL DIGITAL SURROUND 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. [. . . ] The display shows: Press More for help · Press Calib. After a few seconds the display shows the first calibration test: Press More for help Wizard complete Back Exit Restart Either: · Press Exit to return to standby. Or: · Press Restart to return to stage 1; see Stage 1: Resetting the Left ìî Level ïñ +0. 0dB óòô öõú product, page 20. 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 Calibrating 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: Left Sub Centre Right 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. Even if the speakers are not THX approved this setting is recommended. If you have Meridian DSP loudspeakers they cannot be set above +0dB. Left Side Right 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 27. Calibrating the system · Use > and < to move between each of the speakers in the layout. The display shows the speaker being tested, and the distance: Press More for help The next display shows the distance for the same speaker. For example: Press More for help Left ìî Distance 18'0 ïñ óòô öõú Left Units ìî Distance 18'0 ïñ óòô öõú · Choose the correct setting as follows: Setting Correct What it sounds like The sound between the speakers is very even, and does not change radically as you move your head. Incorrect The sound appears diffused, and changes in timbre and apparent location as you move your head. Pay particular attention to the centre channel, as this can have a dramatic effect on the overall sound. · Press > to proceed to the next calibration stage. · Use A and V to change the distance. · You can press Units to change between feet/inches and metres. Repeat this for each of the speakers in your layout. · Press > to proceed to the next calibration stage. Fine tuning These tests allow you to fine-tune the phase and delay of each speaker when used in conjunction with other speakers on the layout. · Use > and < to move between each of the speakers in the layout. The first display allows you to adjust the phase. For example: Press More for help Left ìî Phase ïñ óòô + öõú Speaker size These tests allow you to determine the bass handling capability of subwoofers and large analogue speakers. [. . . ] To clean the audio and video connections The audio and video sockets on the back of the product are gold plated and do not need to be cleaned if gold-plated phono plugs are used. 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. To change the mains fuse · Remove the mains connector, and pull out the drawer above the power input to access the fuse. [. . . ]