HARMAN KARDON BASSLINK4SC
Service Manual

Amplifier Expansion Module

BassLink 4sc

TUNING BASSLINK II AND 4SC
SETTING THE FRONT SPEAKER AND SUBWOOFER LEVELS Note: Refer to page 4, �Controls and Functions, � for the location of controls. 1. Turn on the audio system and verify (using the Balance and Fader controls) that the speakers and input channels are connected properly � when the Balance control is turned to the left, only the left speakers should play, and when the control is turned to the right, only the right speakers should play. BassLink II�s subwoofer should play regardless of the Fader or Balance control�s position. 2. Turn the Rear Gain (located on the 4sc�s end panel) and BassLink II�s Gain control (located on BassLink II�s front panel) all the way down. Turn the Front Gain (located on the 4sc�s end panel) to 1/4 volume. Only the front speakers should be playing. Additionally, turn BassLink II�s Crossover control and Bass Boost control to their midpoint positions and set BassLink II�s phase control to the 0° position. 3. Play a dynamic music track with substantial bass content � Track 5 or 9 on the Phantom Center Setup CD is suitable � and turn the source unit�s volume control to 3/4 volume. 4. Turn the Front Gain control up until you hear slight distortion in the music (fuzzy or crackling sounds). Then reduce the Front Gain control slightly until the distortion is no longer present. 5. Turn the Sub Level control (on the remote level control) to its maximum output setting (fully clockwise). 6. While listening to the same track that you used in step 3, turn BassLink II�s Gain control clockwise until the servo light (located on BassLink II�s end panel) begins to flash with each bass note but doesn�t stay lit continuously. 7. While sitting in the driver�s seat, listen to your system, making a mental note of the amount of upper bass being reproduced. 8. Switch the Phase control to the 180° position and listen again for upper bass content. There may be more upper bass, less upper bass or there may be no change. The position that provides the most upper bass is correct, but choose either setting according to your preference. 9. Adjust the Crossover control until you hear only low-frequency information coming from BassLink II�s woofer. You should use the highest (clockwise) position possible that doesn�t allow any vocal information to be audible from BassLink II�s woofer (when you listen in the driver�s position). 10. Adjust the Bass Boost control clockwise or counterclockwise to suit your preference. ABOUT THE PHANTOM CENTER CIRCUIT Note: In order for the Phantom Center to work properly, the front speakers MUST be connected in correct polarity. Additionally, some factoryinstalled audio systems use extensive and non-defeatable equalization and channel delay, which may diminish the effect of the Phantom Center circuit. The Phantom Center circuit provides four tuning selections: Off, 1, 2 and 3. The three settings process the audio signal differently and provide optimization for several different car sizes and front speaker mounting locations. The chart below indicates switch positions that will probably sound best for a variety of car sizes and speaker locations but there is no correct setting. You should choose the one you like best. car size small mid-size large Midrange Speaker Location doors dash kick panel 2 2 or 3 3 1 or 2 2 or 3 3 1 2 2 or 3 Using the Phantom Center Setup CD (included with your BassLink 4sc) you�ll listen to some instructions, a spoken setup track and several music selections to determine the best adjustment for your system. The first four tracks are spoken tracks, with Track 3 being the most important of those tracks. Portions of Track 3 have been recorded through the equivalent of the Phantom Center circuit. Listen to Track 3, �Spoken Setup Track� and choose the switch position that , provides the best illusion of a person speaking halfway between the front speakers. Track 3: 0:00-0:10 0:11-0:21 0:22-0:33 0:34-0:47 0:48-0:60 Switch in the Off position Switch position 1 Switch position 2 Switch position 3 Rapid switching between the three positions

Note: The Phantom Center circuit affects the midrange speaker only in switch position 1, but may affect the separate tweeter as well in switch positions 2 and 3, depending on the tweeter�s cutoff frequency. If you have separate tweeters mounted in the tops of the doors or in the dashboard, and the chart indicates two possible switch positions, the second position may be the better choice.

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