User manual MERIDIAN G68SL DIGITAL SURROUND INSTALLATION GUIDE

[. . . ] G68 Digital Surround Controller Installation Guide ii Preface Important safety instructions · Read the instructions. · Install only in accordance with the manufacturer's instructions. WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE. This apparatus has been designed with Class 1 construction and must be connected to a mains socket outlet with a protective earthing connection (the third grounding pin). [. . . ] 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. · 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. 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. Once set, the digital surround controller will limit the bass level to protect the speakers from potential damage. On starting the test the speaker sizes are set to zero to avoid the possibility of damaging the speakers, and the display shows: Press More for help Calibrating the system Sizes set to zero ìî ïñ óòô öõú The display then shows the first large analogue speaker; for example: Press More for help Left ìî Size ïñ 0 óòô öõú · Press A or V to adjust the size value for the speaker until it just begins to distort distinctly, and then reduce the value by one. · Press > or < to move between each of the speakers to be adjusted. This is the last test in the calibration procedure; see To complete the calibration procedure, page 30. Calibrating the system Using the Sine/Sub/Sens controls This section explains how to use the Sine/Sub/Sens controls to check for room resonances, adjust the subwoofer crossover frequency, or adjust the sensitivity of the analogue sources. The display shows the current crossover frequency: To display the Sine/Sub/Sens controls · If necessary, unlock the digital surround controller as described in · Press Xovr- or Xovr+ to decrease or increase the crossover frequency. Configuration Wizard, page 27. · Select a source and press More until the bottom line of the display shows: CD Sine Xover -Xover+ 85Hz -Sens. + For THX loudspeaker systems you should not adjust these settings; they should be left at 80Hz. You may prefer, however, to lower the crossover frequency for music if the main speakers have good bass handling down to, say, 50Hz. · Press Sine/Sub/Sens. The bottom line of the display shows the Sine/Sub/Sens controls: Sinewave sweep test The G68 includes a sinewave signal test, to help you set the subwoofer crossover frequencies, or check for room resonances. To avoid possible damage to the speakers the volume is reduced to 50 on entering the test. Bass protection is turned off during this test, and very loud low-frequency signals may damage the speakers. To use the sinewave sweep test · Select a source, then display the Sine/Sub/Sens controls as described above. [. . . ] Ensure that no liquid enters the casework and that the product is completely dry before re-connection. 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. To change the mains fuse · Remove the mains connector, and pull out the drawer above the power input to access the fuse. [. . . ]