Harman Kardon CITATION RECEIVER Owners Manual - Page 13
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If you do not get sound at this point, check the control positions given. Be sure that the TAPE 1 and TAPE 2 switches are in the extended position. Occasionally, an FM stereo multiplex circuit will introduce high frequency noise or hiss when processing a weak FM stereo broadcast. Rotating the MPX FILTER switch clockwise to ON will blend the high frequency program material of the left and right channels to eliminate much of this noise. If the noise persists, rotating the STEREO MODE switch counterclockwise to OFF will disengage the multiplex circuit. The broadcast will be received monophonically and the STEREO beacon will be off. Rotate the tuning control to move the dial pointer to the extreme right-hand side of the dial scale. The hiss you hear is interstation atmospheric noise picked up by the tuner. An FM muting circuit can be activated to eliminate this noise. To use this circuit, rotate the MUTE control slowly clockwise until the hissing disappears. The MUTE control is now adjusted to cancel interstation noise while allowing the greatest number of FM stations to be heard. Turning the control further clockwise will mute some of the weaker stations along with the noise. When the MUTE control is turned fully clockwise all but the strongest FM stations are muted. When the con- trol is turned fully counterclockwise into the detent position, the muting is disengaged. To receive AM broadcasts, touch the Sensor for AM. The lower dial scale is calibrated for AM broadcast frequencies. Note that when an AM station is tuned, the Quieting Meter acts as a signal-strength meter; and deflects to the right for best reception. For convenience. a third scale, the logging scale, with arbitrary numbers from 0 to 10, allows you to simplify the task of locating stations. All you need remember is that a particular station appears at a certain number on the logging scale. For your convenience the logging scale and illuminated dial pointer are repeated on the top of the Citation Receiver, Speaker Phasing Speaker phasing refers to the connecting of two stereo speakers to the Receiver in the same way. That is, the red terminal on the Receiver should be connected to the positive speaker terminal in each case. and the black to negative. If you have followed the suggestions on speaker wire coding mentioned under Connecting Speakers; your speakers should already be in phase. Now that you are listening to sound, you can check the phasing by ear if you wish. The diaphragms of speakers that are in phase with each other move simultaneously in the same direction in response to the same signal from the Receiver. The aural result is firm. solid bass and precise lateral location of the sound source. Speakers that are out of phase produce weaker bass and less coherent, less pre- cise location of the sound. To check for proper phasing by ear: 1. Rotate the STEREO MODE switch counterclockwise to the OFF position. 2. Play a broadcast with a single speaking or singing voice, or a solo instrument. 3. Stand in a position equidistant between the two speakers, If the voice or instrument appears to be coming from an area directly between the two speakers, the speakers are in phase. If the sound appears to be coming from two individual speakers, they have been connected incorrectly and are out of phase. To correct phasing. reverse the positive and negative conductors at the terminals of only one speaker. The speakers will now be in phase. Repeat the procedure for each pair of speakers. When you finish, return the STEREO MODE switch to the ON position. 11