NAD T770 owner manual Level Calibration

To resolve this problem, the T770’s circuitry includes a system that will delay the signal for the speaker closest to the listener. This ensures sound coming from all speakers always arrives at the listener’s ears at the correct time. To set Speaker Distance:

•From the listening position, measure the exact distance to each speaker.

•Call up the Main menu of the On Screen Display (Fig. 6).

•Select the “Speaker A Menu” (Fig. 12).

•Choose the “Speaker Distance” submenu (Fig. 14).

•Select “Front” and enter the distance in either feet or metres. Depending on the version of your T770, you can change the distance in feet or metres with 1 foot or 0.3 metre increments from 1 (0.3m.) to 30 foot (9.0 m.).

•Select “Centre” (if installed) and again enter distance. The Center speaker must be within 2 metres in distance compared to the Left and Right speakers.

•Select “Sur.” (if installed) and enter distance again. The surround speakers should not be further away from the front channel speakers.

LEVEL CALIBRATION

The output levels of each of the speakers connected to the T770 need to be adjusted so that there is an even balance of sound from all the speakers in the system. If, for instance, the relative volume level to the Left and Right speakers the center is set too low, most of dialogue may be difficult to follow. If, on the hand it is set too loud, the overall balance will sound unnatural.

To facilitate the Level calibration procedure the T770 is equipped with a Test signal generator to help asses the loudness levels of each speaker. Before starting the Level Calibration procedure make sure the master volume is turned down to a normal listening level.

•Call up the Main menu of the On Screen Display (Fig. 6).

•Select the “Speaker A Menu” (Fig. 12).

•From the listening position, choose the “Level Calibration” submenu (Fig. 15). The T770’s built-in test signal generate will start the noise signal that scrolls to each of the speaker channels:

Left ➜ Center ➜ Right ➜ Right Surround ➜ Left Surround ➜ Subwoofer ➜ Left ➜ etc.

Select the channel for which you wish to adjust and set the level so that it matches the other speakers. For best results it is best to start with the Left channel: Set at 0dB and to match the other speakers to it. Normally, if the Right speaker is located at the same distance from the listening position to the Left speaker it should be set at the same level as the Left speaker.

The Level for each speaker can be adjusted in 1dB increments. Continue to calibrate the level for each speaker until for equal loudness is achieved at your listening position. A more accurate adjustment can be made using a sound level meter, if available. Set the meter to ‘Slow’ and ‘C-weighted’ modes and re-check the settings with the meter placed in several different positions in the general listening area.

If a Sub-Woofer is used on the system, adjust the Sub-Woofer’s level control so that it is audible, but does not dominate the sound.

The Level settings are stored in the T770’s memory. They are automatically recalled when the unit is switched on.

Depending on the software played back on the T770 is may sometimes be desirable to make minor adjustments to the level of the Center, Surround speaker or subwoofer. Instead of through the OSD Speaker Setup procedure it is also possible to access Level Calibration direct:

•Make sure the volume is set to a normal listening level. On the remote control, press the Test button (No. 12). The test signal is now audible through the Left speaker.

•Press the Channel Select button (No. 13) to select the speaker for which you wish to adjust the level. Each successive press of the button advances the sound of the Test generator to the next speaker: From Left ➜ Center ➜ Right ➜ Right Surround ➜ Left Surround ➜ Subwoofer, etc. It is indicated in the display area which speaker has been selected.

•Press the Level or button (No. 14) to adjust the level for the selected channel.

•Once adjustments have been made, press Test again. the test generator will switch off and normal operation will resume.

NOTE: The Test generator will switch itself off if no level adjustments were made for more than two minutes.

LFE (Low Frequency Effects, with a Dolby Digital source the subwoofer channel) can be set from the normal mode 0dB to a lower level -10dB. If the bass from the subwoofer is too loud, set the LFE option to -10dB.

The Delay time for the Surround speakers also needs to be correctly set for your normal listening position. Refer to the section “Setting the Surround Delay” in this chapter for more information.

GB

19