Harman Kardon 150 Owners Manual - Page 6

SPEAKER PHASING For maximum enjoyment of multichannel sound, it is important to have the four speaker systems in phase. The phase relationship must be correct, not only between the front left and right speaker systems, the back left and right speaker systems, but also between the front and back channels. When connecting each speaker system to the receiver, be certain to maintain plus and minus polarities, If your speakers do not have a plus/minus polarity identification, phasing can be accomplished by the following procedure: 1. After connecting your speakers, place the receiver in the MONO mode of operation and the SOUND FIELD BALANCE control to the exact top center position. 2. Play a record, tape or FM broadcast which has a single speaking or singing voice, or a solo instrument. 3. The voice or instrument should appear to be emerging from an area somewhere in the center of the two speakers. If the voice seems to come from both speakers independently, the speakers are out of phase. 4. If you determine that your speakers are out of phase, merely disconnect the leads from only one of the speakers and reverse them. Your stereo system will now be in phase. This completes the phasing of a pair of speakers for stereo operation. Repeat this process for all additional pairs of speakers in your system. OPERATING PROCEDURE Every control on this receiver serves a specific and useful function and is important for the proper operation of your stereo or 4-Channel system. Read this section carefully so you can take full advantage of all the per• formance capabilities of this receiver. SWITCHES AND CONTROLS - REAR PANEL STEREO/QUAD SWITCH The 150+ receiver is shipped with the STEREO/QUAD switch in the QUAD mode. A special safety latch is fitted next to the switch to prevent throwing the switch accidentally while the receiver is turned on. If you plan to use the 150+ as a DOUBLE-POWER STEREO receiver, first turn off the unit, remove the safety latch and throw the STEREO/QUAD switch to STEREO. NOTE: After changing position of this switch ALWAYS replace the safety latch. The two front channels now have the capability of delivering double power to your speakers. NOTE: WHEN THE STEREO/QUAD SWITCH IS IN THE STEREO POSITION THE BACK SPEAKERS ARE INOPERATIVE. IF YOU WISH TO USE THE RECEIVER TO POWER ANY BACK SPEAKERS, FIRST TURN OFF THE RECEIVER. REMOVE THE LATCH AND THROW THE STEREO/QUAD SWITCH TO QUAD. REPLACE THE PROTECTIVE LATCH, MUTING ADJUSTMENT CONTROL This rear panel control adjusts the level at which muting action will take place. Minimum muting action occurs in the full counterclockwise position. Maximum muting is achieved in the full clockwise position. The full clockwise position will also eliminate stations with poor transmission quality. The control should be adjusted to the point where you receive only those stations which meet your standards of broadcast quality. SWITCHES AND CONTROLS - FRONT PANEL POWER SWITCH The POWER switch performs the function as its name denotes. It supplies power to the receiver. When the pushbutton is depressed to turn the set ON the power light will illuminate. HEADPHONE JACKS The stereo or 4-CH headphone receptacles located on the front panel of your 150+ receiver will accept any type of headphone. Stereo phones come with a single plug which should be connected to the FRONT receptacle. 4-CH phones come with two plugs. Connect the front plug to the FRONT receptacle and the back plug to the BACK receptacle. The headphone receptacles are "ON" at all times. To listen only to your phones without having your speakers on, merely set the SPEAKER switches on the front row of pushbuttons to "OFF". MAIN SPEAKER SWITCH In order to hear the speakers connected to your main system, the respective FRONT and BACK MAIN speaker switches must be depressed. When in the "ON" position the speakers connected to the main system are "ON". Should you desire to listen to stereo or 4-CH headphones alone, the speakers can be turned off at your discretion. 5