Infinity Stereo Amplifier 4SC User Manual

BassLink® 4sc  
®
BassLink 4sc  
 
CONNECTIONS  
Note: In order for the Phantom Center circuit to  
operate properly, the speakers and input wires  
MUST be connected in proper polarity!  
INPUT CONNECTIONS  
If your source unit provides only speaker-level  
output wires, connect those wires to the Universal  
Interface connections as shown in Figures 3a or 3b.  
Note: If your source unit provides two line-level  
outputs and two speaker-level outputs, you may  
connect the line-level output to the appropriate  
(front or rear) RCA-type input and the speaker-  
level outputs to the other (front or rear)  
Universal Interface connector.  
You must connect full-range signal to all four  
inputs on BassLink II (if you are using the 4sc).  
Do not connect a subwoofer output to any of  
the inputs if you are using the 4sc.  
SPEAKER CONNECTIONS  
If your source unit provides line-level outputs  
with RCA-type connectors, connect the signal  
cables to the FRONT and REAR LINE LEVEL  
inputs as shown in Figure 3c or 3d.  
Connect the speakers to the FRONT and REAR  
screw terminals, observing proper polarity  
(Figure 3).  
Connect the input signal wires according to  
Figures 3a through 3d.  
Figure 3.  
3a.  
3c.  
RR  
LR  
Rear  
Remote Level  
Control  
Front  
Remote Level  
4-Channel Speaker Outputs  
(from Source Unit)  
Control  
4-Channel Line-Level Outputs  
(from Source Unit)  
3d.  
3b.  
BassLink II  
Remote Level  
Control  
Source Unit  
Remote Level Control  
RF  
Remote Level  
Control  
2-Channel Speaker Outputs  
(from Source Unit)  
LF  
®
2-Channel Line-Level Outputs  
(from Source Unit)  
BassLink 4sc  
3
 
CONTROLS AND FUNCTIONS  
REMOTE CONTROL  
BASSLINK 4sc  
BASSLINK II  
Figure 7.  
Figure 4. REMOTE LEVEL controls.  
Figure 5. BassLink 4sc controls.  
Figure 6. BassLink II controls on the front panel.  
SUB LEVEL: Use this control to adjust the  
amount of bass to suit your preference.  
PHANTOM CENTER: Use this switch to select the  
proper adjustment of the Phantom Center circuit  
according to your car and your preference.  
POWER LED:This indicator will glow blue when  
BassLink II is operational.  
PHASE Control: Use this switch to reverse  
the phase of BassLink IIs output with respect  
to its input.  
PHANTOM CENTER:  
LEFT: Slide the switch to this position to provide  
a phantom center for front left seating position.  
OFF: Slide the switch to this position to turn off  
Phantom Center processing.  
FRONT/REAR GAIN: Use these to adjust the levels  
GAIN Control: Use this control to adjust the  
relative volume (loudness) of BassLink II with  
respect to the other speakers in the vehicle.  
of the front and rear speakers.  
AUTOTURN ON: For speaker-level connections,  
use this switch to activate (or deactivate)  
BassLink IIs automatic turn-on circuit.  
POWER LED:This indicator will glow blue when  
BassLink II and 4sc are operational.  
RIGHT: Slide the switch to this position to provide  
a phantom center for front right seating position.  
CROSSOVER: Use this control to adjust the  
amount of high-frequency information present  
in BassLink IIs output.  
SERVO LED:This indicator glows blue when the  
subwoofer is at maximum excursion and the  
amplifier is modifying the output to maintain  
maximum performance.  
Note: Once you have chosen the best Phantom  
Center switch position and made the necessary  
adjustments to the Front Gain and Rear Gain  
controls and set the Subwoofer Level control  
and Phase switch, you won’t need to make any  
further adjustments on the BassLink II or the 4sc.  
BASS BOOST: Use this control to correct any  
perceived peak or dip in the bass response  
(typically around 40Hz in most vehicles). Set the  
control to any value between –6dB and +3dB,  
according to your preference.  
For more information about using the controls,  
see “Tuning BassLink II and 4sc” on page 5.  
4
 
TUNING BASSLINK II AND 4SC  
SETTINGTHE FRONT SPEAKER AND  
SUBWOOFER LEVELS  
5. Turn the Sub Level control (on the remote  
level control) to its maximum output setting  
(fully clockwise).  
ABOUT THE PHANTOM CENTER CIRCUIT  
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, withTrack 3 being the most important  
of those tracks. Portions of Track 3 have been  
recorded through the equivalent of the Phantom  
Center circuit. Listen toTrack 3, “Spoken Setup  
Track, and choose the switch position that  
provides the best illusion of a person speaking  
halfway between the front speakers.  
Note: In order for the Phantom Center to work  
properly, the front speakers MUST be connected  
in correct polarity. Additionally, some factory-  
installed audio systems use extensive and  
non-defeatable equalization and channel delay,  
which may diminish the effect of the Phantom  
Center circuit.  
Note: Refer to page 4, ”Controls and Functions,”  
for the location of controls.  
6. While listening to the same track that you  
used in step 3, turn BassLink IIs Gain control  
clockwise until the servo light (located on  
BassLink IIs end panel) begins to flash with  
each bass note but doesn’t stay lit continuously.  
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 IIs subwoofer should play regardless  
of the Fader or Balance controls position.  
7. While sitting in the drivers seat, listen to  
your system, making a mental note of the  
amount of upper bass being reproduced.  
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.  
Track 3:  
0:00-0:10 Switch in the Off position  
0:11-0:21 Switch position 1  
0:22-0:33 Switch position 2  
0:34-0:47 Switch position 3  
0:48-0:60 Rapid switching between  
the three positions  
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.  
2. Turn the Rear Gain (located on the 4scs end  
panel) and BassLink IIs Gain control (located  
on BassLink IIs front panel) all the way  
down. Turn the Front Gain (located on the  
4scs end panel) to 1/4 volume. Only the front  
speakers should be playing. Additionally,  
turn BassLink IIs Crossover control and Bass  
Boost control to their midpoint positions and  
set BassLink IIs phase control to the 0° position.  
Midrange Speaker Location  
car size  
small  
mid-size  
large  
doors  
dash  
2 or 3  
2 or 3  
2
kick panel  
2
1 or 2  
1
3
3
9. Adjust the Crossover control until you hear  
only low-frequency information coming from  
BassLink IIs woofer. You should use the  
highest (clockwise) position possible that  
doesn’t allow any vocal information to be  
audible from BassLink IIs woofer (when you  
listen in the drivers position).  
2 or 3  
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 units volume control to 3/4 volume.  
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 tweeters  
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.  
10. Adjust the Bass Boost control clockwise or  
counterclockwise to suit your preference.  
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.  
®
BassLink 4sc  
5
 
TUNING BASSLINK II AND 4SC (CONTINUED)  
Tracks 5 through 16 are music tracks. There  
are three excerpts of songs and each excerpt  
is recorded four times; once with no processing  
(switch in the Off position), once through switch  
position 1, once through switch position 2 and  
once through switch position 3. Using the music  
tracks, choose the switch position that distributes  
the sound best between the right and left speakers.  
You can use the following list of tracks as a guide.  
PHANTOM CENTER SETUP CD  
SETTINGTHE PHANTOM CENTER CIRCUIT  
1. Before you begin, set the Phantom switch on  
the remote control for the seat in which you  
are sitting. Set the Phantom Center switch on  
the 4sc in the Off position.Turn the Rear Gain  
control on the 4sc all the way down (counter-  
clockwise) and make sure no sound is coming  
from the rear speakers.  
ADDING THE SOUND FROM THE REAR  
SPEAKERS  
With music playing, turn the Rear Gain control  
clockwise until sound from the rear speakers is  
clearly audible but not so loud that it makes the  
music seem to come from the back of the car.  
Track 1  
Track 2  
Track 3  
Track 4  
Track 5  
Track 6  
Track 7  
Track 8  
Track 9  
Introduction  
Instructions forTrack 3  
Spoken SetupTrack  
Instructions for MusicTracks  
Lonely Savior (no processing)  
Lonely Savior (switch position 1)  
Lonely Savior (switch position 2)  
Lonely Savior (switch position 3)  
AnotherTime, Another Place  
(no processing)  
2. Insert the Phantom Center Setup CD into your  
CD player.  
3. Follow the spoken instructions on the setup CD.  
4. Once you have chosen the switch position you  
like best usingTracks 1–17, stop the CD and  
move the Phantom Center switch on the 4sc  
to the position you have chosen. You can use  
Track 17 and the music selections that follow  
(Tracks 18–20) to check your work.  
Track 10 AnotherTime, Another Place  
(switch position 1)  
Track 11 AnotherTime, Another Place  
(switch position 2)  
Track 12 AnotherTime, Another Place  
(switch position 3)  
Track 13 Cinderellas Revelation  
(no processing)  
Track 14 Cinderellas Revelation  
(switch position 1)  
Track 15 Cinderellas Revelation  
(switch position 2)  
Track 16 Cinderellas Revelation  
(switch position 3)  
Track 17 Conclusion  
Track 18 Lonely Savior: Ken Birmingham  
Track 19 AnotherTime, Another Place:  
Mike Christian  
Track 20 Cinderellas Revelation: Joe Chinnici  
6
 
TROUBLESHOOTING  
SPECIFICATIONS  
BassLink 4sc  
PROBLEM:  
BassLink II and 4sc Power LEDs are not lit.  
PROBLEM:  
PROBLEM:  
BassLink 4sc Power LED lit but no sound from  
one or all speakers.  
No output from BassLink II when head-unit  
fader control is set to front or rear (in a  
4-channel connection).  
Amplifier Power:  
35W x 4 channels at 4 ohms  
50W x 4 channels at 2 ohms  
Frequency Response: 90Hz to 47kHz  
Fuse: 30A  
Max. Current Draw: 26A  
CAUSES and SOLUTIONS:  
1. Poor or improper power connection. Check  
power, ground and remote connections.  
Check speaker level input for proper  
connections (see No Output).  
CAUSES and SOLUTIONS:  
1. Improper input signal connections. Check  
all input connections on BassLink II and  
source unit.  
CAUSE and SOLUTION:  
Input connections are improperly wired.  
Verify all connections (see Connections,  
on page 3).  
Idle Current Draw:  
Input Sensitivity:  
<800mA  
100mV to 6V line-level input  
1V to 16V universal interface  
2. Blown or improperly installed fuse.  
Check main battery fuse and replace  
if necessary.  
2. Damaged speaker wire or improper speaker  
connections. Check speakers and wiring;  
change if necessary.  
3. Improper signal connections between  
BassLink 4sc and BassLink II. Check gray  
ribbon signal cable connection to 4sc  
(see Installation, Figure 2).  
Crossover Frequency: Fixed 80Hz high-pass  
Check fuse on BassLink II and 4sc.  
Crossover Slope:  
12dB per octave  
PROBLEM:  
BassLink II turns on before head unit is  
completely on and produces a “thump”  
sound.  
PROBLEM:  
4sc Power LED not lit but BassLink II  
Power LED is.  
CAUSE and SOLUTION:  
PROBLEM:  
Music sounds distorted.  
For speaker-level connections, head unit is  
producing a false turn-on signal. On BassLink IIs  
side panel, slide AUTO TURN ON to OFF. It will  
be necessary to connect the Remote lead  
to a switched ignition voltage source.  
CAUSES and SOLUTIONS:  
1. Improper power connection between  
BassLink 4sc and BassLink II. Check Power  
Connector (see Installation, Figure 2).  
2. Improper signal connection between  
BassLink 4sc and BassLink II. Check gray  
ribbon signal cable connection to the 4sc  
(see Installation, Figure 2).  
CAUSES and SOLUTIONS:  
1. Gain levels are set too high or head unit  
volume is too high. Reduce volume and/or  
Gain Levels.  
2.Tone Controls on head unit misadjusted.  
Check controls and adjust as necessary.  
PROBLEM:  
BassLink IIs BassLink 4sc POWER LED  
remains on after head unit is turned off.  
3. Blown or improperly installed BassLink 4sc  
fuse. Check fuse and replace if necessary.  
PROBLEM:  
No output from BassLink 4sc and BassLink II.  
CAUSE and SOLUTION:  
For speaker-level connections, this is normal  
operation when AUTO TURN ON is set to ON.  
BassLink II and BassLink 4sc will remain on for  
another 5 to 10 minutes after sensing that audio  
signals are not present before shutting down.  
CAUSES and SOLUTIONS:  
Input connections are improperly wired. Verify  
all connections (see Figures 4 and 5).  
®
BassLink 4sc  
7
 
Declaration of Conformity  
We, Harman Consumer Group International  
2, route de Tours  
72500 Chateau du Loir  
France  
A valid serial number is required for warranty coverage.  
This product is designed for mobile applications and is not intended for connection to the mains.  
Features, specifications and appearance are subject to change without notice.  
declare in own responsibility that the product described in this owner’s  
manual is in compliance with technical standards:  
Infinity, Harman International and BassLink are trademarks of Harman International Industries, Incorporated, registered in the United States and/or other countries.  
EN 55013:2001+A1:2003  
EN 55020:2002+A1:2003  
Infinity Systems, 250 Crossways Park Drive, Woodbury, NY 11797 USA  
© 2005 Harman International Industries, Incorporated. All rights reserved. • Part No. BASSLINK4SCOM10/05  
Klaus Lebherz  
Harman Consumer Group International  
Chateau du Loir, France 10/05  
¤
 

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