Dolby 3 stereo, Dolby 3 stereo adjustment, Remote control unit only – Kenwood UD-900M User Manual
Page 25: I set the dolby 3 stereo mode, Select the center mode, Turn on the test tone, Adjust the center speaker volume, 0 stop generating the test tone, Dolby 3 stereo playback, Set the dolby 3 stereo mode

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