Harman Kardon A401 Owners Manual - Page 6
Operating, A-401
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Operating the A-401 O 0 cu, O 1X-0 • MO, CONOker O • harman/kardori C.grtre,i, , conlrop amplifier A• 1 4 2 Familiarize yourself with the front panel controls. There are five knobs and six pushbuttons controlling all the features of the amplifier. Each of the controls performs a different function, but instead of discussing each control separately, we will illustrate how they work together to control the reproduction of sound through the A-401. Find the VOLUME control and turn it down (counterclockwise). Push the POWER switch to turn the A-401 on. Playing Records with the A-401 Five basic controls are used to play back disc recordings through the A-401. FUNCTION, VOLUME, BALANCE, TREBLE and BASS. Make the following adjustments to these controls and the SPEAKERS switch after activating your turntable or record changer: (1) SPEAKERS 1 - On (Push "in") (2) FUNCTION - "Phono" position (3) BALANCE, BASS, TREBLE - Neutral position (12 o'clock) (4) VOLUME - Advance (clockwise) to comfortable loudness level. You should now hear sound from the disc through your system. To increase or decrease the loudness of the playback, the VOLUME control may be advanced (clockwise) or turned down (counterclockwise). The BALANCE control if turned counterclockwise will shift the loudness to the left speaker by attenuating (reducing the loudness of) the right speaker. When turned in the other direction, it has the opposite effect. The SPEAKER 1 pushbutton connects or defeats the loudspeakers connected to SPEAKER SYSTEM 1. (If you have speakers connected to SPEAKER SYSTEM 2, they are controlled by the SPEAKERS 2 pushbutton on the front panel). Play a stereo disc with strong bass passages. Listen carefully to the bass. If you don't think it is as full as it should be reverse the speaker connections for one speaker. If the bass response improves your speakers were out of phase. If the bass response is poorer reconnect the speaker as it originally was. Push the POWER switch off. Recheck your connections both at the rear of the A-401 and at the terminals of both loudspeakers. If you are using two dissimilar loudspeakers, it is possible that their internal connections have reverse polarity, causing them to be out of phase. Reverse the connections made at the speaker or the amplifier (NOT BOTH) for one channel ONLY. The system should now be in phase. The phasing test can be done with any program material, but disc recordings are the recommended method. Stereo material is suggested to make the effect more obvious. If you do not get sound at this point, check the control positions given above. Also, be sure the TAPE MONITOR switch is in the "out" position. Leave the volume control at the 9 o'clock position while you are adjusting the other controls. If you still get no sound, check the back panel connections for PHONO, then check the turntable itself. NOTE: Whenever you check connections at the back panel, always push the POWER switch off. If, at average listening levels, you hear an objectionable (i.e. easilt• amount of hur t. .ing the ground wire io the A-401. Son .urntabie; . e com- binations, actually produce les, itium thin way: Another source of hum is in ttiguate seating of the shot-10 signal castes in the receptacles of the A-401. Check this thoroughly.