Yamaha AV-75PRO AV-75PRO OWNERS MANUAL - Page 10

NATURAL SURROUND The Natural Surround is an exclusive YAMAHA surround-sound processing mode which is effective with all music and audio sources of video sound. It creates a natural, lifelike surround-sound effect without the use of delay circuitry, adding considerable depth and imaging to all audio sources. It is recommended for both music listening and for viewing stereo video sources. Note If a monaural sound source is used in the Dolby Pro Logic or Natural Surround mode, no sound will be heard from the rear speakers. INPUT BALANCE CONTROL ADJUSTMENT To obtain the best surround-sound condition, be sure to adjust the INPUT BAL control. 1. Disconnect the speaker wires from the front speakers (so that the sound from the front speakers will not be heard). 2. Set the front panel controls as follows. • Set the CENTER MODE selector to the "OFF" position. ® SURROUND MODE ON/OFF switch - Set to ON. • SURROUND MODE selector - Set to the DO PRO position. o REAR level control - Set to the "10" (maximum) position. 3. Set the INPUT BAL control to the center position. 4. Play the monaural portion (such as dialogue) of a program source encorded with Dolby surround-sound. 5. Increase the VOLUME control setting so that you can hear the monaural program source through the rear speakers. 6. Then minimize the rear speakers' output by slightly turning the INPUT BAL control clockwise or counterclockwise until you achieve a "null" (ie., minimum output from your rear speakers). NOTE: As you approach the "null", increase the VOLUME control setting to better hear your rear speakers. With this adjustment, the best surround-sound balance can be obtained. FRONT/CENTER/REAR SPEAKER BALANCE ADJUSTMENT Using the built-in test tone generator, this procedure lets you adjust the volume balance between the front, center, and rear speakers. This adjustment is important for proper Dolby Pro Logic Surround-sound operation. 1. Set the SURROUND MODE ON/OFF switch to ON. 2. Set the SURROUND MODE selector to the " DO PRO" position. 3. Set the CENTER MODE selector to the NORM position. 4. Turn on the TEST tone switch. 5. Turn up the VOLUME control. You will hear a test tone (pink noise) from the right front speaker, then the center speaker, then the left fron speaker, then the rear speakers, for about two seconds each. 6. Adjust the REAR level and CENTER level controls so that the volume heard at the listening position is the same from each speaker. • If not using a center speaker, be sure to set the front panel CENTER MODE selector to the PHANTOM position. You will then hear the centE channel test tone from the left and right front speakers. After completing this adjustment, turn off the front panel TEST switch. OPERATION 1. Set the SURROUND MODE ON/OFF switch to ON. 2. Select the surround mode with the SURROUND MODE selector. 3. Play the program source. 4. Use the VOLUME control to adjust the whole sound level.