Harman Kardon TC600 Owners Manual - Page 21
control settings until the system is loud
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For standard low-level (preamplevel) inputs: I"V"-l-U*bl head units provide a nominal lowlevel (preamp level) output signal of aPPr()ximately 500mV. On your amplifier chass;is is a dot indicator located at the 3 o'c lock position on the INPUT control. T..h.-e llNPUT control should be set to this position for normal preamp-type head units. If the system does not distort when tested, and plays loudly enough, leave the INPUT control at this setting. However, if operation is not satisfactory,or your head unit has a non-standard output signal. use the adjustment method described in the following section. For nonstandard low-level (preamp-level) and high-level (speaker-level) inputs: Turn the INPUT SENSITIVITY control all the way down to MIN (full counterclockwise). Select well-recorded, full-range music that you are familiar with to use as source material. Proceed with testing the system by momentarily advancing and reducing the head unit volume control in successively higher levels as follows: If no distortion is present and the system plays loudly enough, leave the INPUT control at the MIN position. If no distortion is present and the system does not play loudly enough, turn up the INPUT control approximately 118 of its rotation clockwise and retest the system for undistorted (unclipped) output. Proceed with successively higher INPUT control settings until the system is loud enough and no distortion is present. If you hear any distortion (clipping) at a new setting, reposition the INPUT control to its previous test setting and leave it there. Note: If the head unit is a preamp-leveltype, you may want to advance the INPUT control in larger steps until it reaches the 12 o'clock position to reduce the number of test steps. Some high-level (speaker-level)connections may result in a limitation of the usable volume control range. In this case, you can obtain additional range in your volume control by installing a line-level adaptor, commonly available from your autosound dealer.