Infinity Car Stereo System 54a 4 Ch User Manual

54a 4-Ch Power Amplifier  
Owners Manual  
Installation Guide  
 
APPLICATIONS  
For your convenience, weve included several application  
diagrams to help you plan your own system installation.  
Figures 1 through 3 show how to configure the Kappa 54a  
for stereo, bridged-mono, and tri-mode operation.  
For system expansion ideas, see the next page.  
NOTE: For simplicity, Figures 1 through 3 do not show power,  
remote, and input connections.  
Figure 1. This wiring  
diagram shows a  
Kappa 54a amplifier  
driving front and rear  
pairs of full-range  
speakers.  
Set Front Mode  
To STEREO  
(on top panel)  
Set Rear Mode  
To STEREO  
(on top panel)  
REM  
R +  
L
+
R +  
L
+
RF Speaker  
LR Speaker  
Set Front Filters Set Rear Filter  
KAPPA 54a  
(rear panel)  
To FLAT & F+R (on AUX)  
To FLAT  
(on top panel)  
+
+
(on top panel)  
-
-
LF Speaker  
RR Speaker  
+
+
-
-
Figure 2. This wiring  
diagram shows a  
Kappa 54a amplifier  
driving a front pair of  
tweeter/ midrange  
Set Front Mode  
To STEREO  
(on top panel)  
Set Rear Mode  
To STEREO  
(on top panel)  
REM  
R +  
L
+
R +  
L
+
systems and a rear pair  
of full-range speakers.  
LR Speaker  
RF  
System  
Set Front Filters Set Rear Filter  
KAPPA 54a  
(rear panel)  
To HP & F+R (on AUX)  
To FLAT  
(on top panel)  
+
(on top panel)  
-
-
+
LF  
System  
RR Speaker  
+
-
-
+
Figure 3. This wiring  
diagram shows a  
Kappa 54a amplifier set  
for tri-mode operation  
to drive a front pair of  
tweeter/ midrange  
Set Front Mode  
To STEREO  
(on top panel)  
Set Rear Mode  
To BRIDGE  
(on top panel)  
REM  
R +  
L
+
R +  
L
+
systems and a single  
rear subwoofer.  
Rear  
Subwoofer  
RF  
System  
Set Front Filters Set Rear Filter  
KAPPA 54a  
(rear panel)  
To HP & F+R (on AUX)  
To LP  
(on top panel)  
(on top panel)  
-
+
+
LF  
System  
-
-
+
Owner s Manual/ Installation Guide – 3  
 
SYSTEM EXPANSION  
5 1⁄4" Speakers  
(Hi-Pass, F& R)  
KAPPA 54a  
-
-
+
+
L/R Inputs  
Figure 4. In this  
example system, a  
Kappa 54a drives  
front and rear pairs of  
5 1⁄4" speakers. The  
54as stereo front and  
rear outputs are  
L/R Outputs  
(F+R Sum)  
Front  
-
-
+
+
summed to feed a  
Rear  
KAPPA 202a  
bridged-mono Kappa  
202a that drives a  
single 12" subwoofer.  
12" Subwoofer  
L/R Inputs  
-
+
Front (Hi-Pass)  
1" Twt.  
5 1⁄4" Speakers  
Rear (Hi-Pass)  
4" Mid.  
Systems  
KAPPA 54a  
KAPPA 102a  
KAPPA 202a  
-
-
+
+
L/R Inputs  
Figure 5. In this  
L/R Outputs  
(Low-Pass)  
expanded system, a  
Kappa 54a drives a  
front pair of  
-
-
Front  
component systems  
and a rear pair of  
5 1⁄4" speakers. The  
54as front low-pass  
outputs feed a Kappa  
102a to drive a stereo  
pair of 6" mid/ bass  
speakers. The 102as  
low-pass outputs feed  
a bridged-mono  
+
-
+
+
Rear  
6" Mid/Bass Speakers  
-
L/R Inputs  
+
Kappa 202a to drive a  
single 12" subwoofer.  
L/R Outputs  
(Low-Pass)  
NOTE: Many different  
systems are possible  
using the crossover  
settings on Kappa  
-
+
amplifiers, including  
ones with 24 dB per  
octave slopes achieved  
through cascaded  
12" Subwoofer  
configurations. For  
more information,  
consult your Infinity  
Car Audio dealer.  
L/R Inputs  
-
+
4 – Infinity Kappa 54a Power Amplifier  
 
PRECAUTIONS AND NOTES  
• The Kappa 54a has five levels of circuit protection that  
monitor the amplifier and will shut it down if the  
electrical system voltage drops below 10 Vdc or exceeds  
15.5 Vdc, temperatures are above 194° F (90° C), short  
circuits occur, or current draw exceeds product  
specifications. For best performance, check the intended  
mounting site to make sure the operating environment  
does not create conditions that will trigger circuit  
protection.  
• Always wear protective eyewear when using tools.  
• The Kappa 54a uses gold-plated, industrial-grade Weco®  
plug-in connectors for power and speaker wiring. Because  
of precision tolerances, do not insert the connectors into  
the amplifier without pre-wiring them first. Once the  
wires are fastened in each shell, they provide additional  
gripping area for easy connector removal.  
• When routing cables, keep input signal cables away from  
power cables and output speaker wires, as shown in  
Figure 6 (below).  
Prior to installation, turn off all audio systems and other  
electrical devices. Also disconnect the (–) negative lead  
from the vehicles battery.  
• When making connections, make sure that each  
connection is clean and properly secured. Observe the  
polarity markings on the rear panel. Refer to the  
application drawings (Figures 1 through 3 on page 3) to  
set up the amplifier for operation in stereo, bridged-  
mono, bi-amp, or tri-mode configurations.  
• At the installation site, locate and make a note of all fuel  
lines, hydraulic brake lines, and electrical wiring. Use  
extreme caution when cutting or drilling in and around  
these areas.  
• Use the amplifier as a mounting template to mark  
locations for the mounting holes.  
• If the amplifier s fuse needs replacement, use only  
the same rating and type as a replacement. Do not  
substitute another kind.  
• Check clearances on both sides of a planned mounting  
surface before drilling any holes or installing any screws.  
Remember that mounting screws can extend up to an  
inch behind the surface.  
SPEAKER Cables  
RF  
RR  
AUDIO Cables  
Source  
Unit  
Chassis  
Ground  
Ignition  
Kappa 54a  
Amplifier  
Battery  
LF  
LR  
Fuses  
+
Chassis  
Ground  
Chassis  
Ground  
POWER and  
REMOTE Cables  
Figure 6. To minimize possible noise pickup, use this suggested cable  
routing scheme to plan your amplifier installation.  
Owner s Manual/ Installation Guide – 5  
 
INSTALLATION  
The Kappa 54a is easy to install. For optimum  
performance, we recommend using high-quality, twisted-  
pair shielded RCA audio cables and 14-gauge or larger  
speaker wire. Also, youll need a minimum of 12-gauge  
stranded copper wire (e.g., red and black jackets) for the  
power connections. Use 18-gauge (e.g., blue jacket) wire for  
remote turn-on.  
M OUNTING THE AMPLIFIER...  
The Kappa 54a can be mounted in virtually any location  
in sid e the vehicle. However, make sure to keep the  
amplifier away from heater vents or ducts.  
1. At the chosen site, use the amplifier as a mounting  
template and mark locations of the four mounting holes.  
Depending on your total system plan, allow for adequate  
time and the possibility of overnight storage of your vehicle,  
since it may take more than one day to complete the  
installation.  
2. Drill a small pilot hole at each marked location.  
3. Mount the amplifier and securely tighten the mounting  
screws.  
W IRING THE AMPLIFIER...  
P ARTS LIST...  
Refer to Figure 7 (below) for details of the Kappa 54as front  
and rear panel connections.  
Examine and verify that the package includes the following  
items:  
1
1. For power, remote, and speaker wires, strip 4" off one  
end of each jacket to reveal bare wire for insertion into  
the Weco connectors.  
• (1) Kappa 54a Power Amplifier  
• (1) Spare ATC fast-blow fuse (40 A)  
• (1) Control cover with (2) machine screws  
• (1) Weco 5-pin audio connector  
• (1) Weco 2-pin power connector  
• (4) #8 mounting screws  
2. Using the Weco 2-pin power connector, connect a black  
wire from the nearest bare-metal chassis component to  
the (–) terminal. Then, connect a red wire from the  
vehicles +12-volt battery terminal to the (+) terminal.  
KAPPA 54a WIRING CONNECTIONS  
(front panel)  
KAPPA 54a WIRING CONNECTIONS  
(rear panel)  
Figure 7. Wiring connections for the Kappa 54a amplifier.  
6 – Infinity Kappa 54a Power Amplifier  
 
INSTALLATION (continued)  
3. Make sure the wires are firmly seated in the Weco 2-pin  
connector and that each screw is completely tightened.  
Insert the wired connector into the POWER socket on the  
amplifier. Press it in until it stops.  
S ETTING INPUT SENSITIVITY...  
Initially, turn the front and rear input sensitivity GAIN  
controls to their minimum (counter-clockwise) positions  
(refer to Figure 8).  
4. Using the Weco 5-pin connector, connect a blue wire from  
the source units remote connection to the REM terminal.  
Depending on polarity requirements (e.g., bridged-mono  
or tri-mode configurations – see Figures 1 through 3 on  
page 3), connect speaker wires from the speakers to the L  
and R (+ and –) terminals, as required by your system  
plan.  
1. Reconnect the (–) negative lead to your vehicles battery.  
Apply power to the audio system and play a favorite  
music track from CD or tape.  
NOTE: After the source unit is on, green LEDs (on the top  
panel) will illuminate, indicating the amplifier is on. If not,  
check the wiring, especially the remote connection from the  
source unit. Also refer to Troubleshooting” on the next page.  
5. Make sure the wires are firmly seated in the Weco 5-pin  
connector and that each screw is completely tightened.  
Insert the wired Weco 5-pin connector into the 5-pin  
socket on the amplifier. Press it in until it stops.  
2. On the source unit, increase the volume control to  
maximum position. Slowly increase the Front and Rear  
GAIN controls (clockwise) towards three o’ clock and, at  
the same time, listen to the quality of the reproduced  
sound. At some point, youll hear distortion on the music  
peaks. Stop the adjustment and turn it back slightly.  
6. Connect RCA cables from a source unit to the L and R  
INPUT jacks.  
S ETTING THE CROSSOVER...  
I NSTALLING THE CONTROL COVER...  
IMP ORTANT: If you pla n to u se th e Ka ppa 54a to d r ive  
fu ll-r a n ge spea ker s, set both AMP a n d AUX filter s to FLAT  
(r efer to Figu r e 1 on pa ge 3 a n d Figu r e 8 below) a n d skip  
to th e n ext section , “Settin g In pu t Sen sitivity”.  
After wiring and testing the Kappa 54a amplifier, install  
the control cover using the enclosed machine screws to  
deter tampering and help seal out dust.  
NOTE: Do not over-tighten the machine screws. Doing so may  
crack the cover.  
1. Set the front and rear CROSSOVER controls to the  
frequency recommended by the speaker manufacturer  
(refer to Figure 8). If the value is unknown, set the control  
midway.  
Figure 8. Kappa 54a front and rear controls for crossover, input,  
and output.  
2. Depending on your system plan, set the AMP and AUX  
switches to LP (low-pass), HP (high-pass), or FLAT (refer  
to Figure 8).  
Owner s Manual/ Installation Guide – 7  
 
TROUBLESHOOTING  
Use the following guide to identify symptoms and solve  
problems. Make sure the vehicles electrical system is  
working properly and power is reaching the Kappa 54a (i.e.,  
green LEDs on the top panel are on).  
SYMP TOM  
LIKELY CAUSE  
SOLUTION  
Audio cycles  
off and on;  
Amber protec-  
tion LEDs (on  
top panel) are on  
A protection circuit  
is turning the  
amplifier off and on  
Verify the following–  
electrical system is  
between 10 ~ 15.5 Vdc;  
temperature is not  
over 194°F (90°C);  
no short circuits;  
speaker loads are not  
less than 1 ohm  
(2 ohms in mono)  
SYMP TOM  
LIKELY CAUSE  
SOLUTION  
No audio  
Low /No Remote  
Turn-On Voltage  
Check connections;  
test turn-on voltage  
Speakers are not  
connected or are  
blown  
Check wiring; use  
VOM/DVM to  
measure speaker  
coil impedance  
Audio cycles  
off and on;  
Amber protection  
LEDs (on top  
panel) are on  
GAIN is set too high  
Set Input Sensitivity  
correctly (see previous  
page)  
Distorted audio Input sensitivity  
is not set properly  
See Setting Input  
Sensitivity on  
previous page  
Fuse blows  
Incorrect wiring or  
short circuit  
Check connections;  
refer to Applications  
(see page 3)  
Audio lacks  
punch”  
Speakers are wired  
with wrong polarity  
Check polarity of  
connections; refer to  
Applications (page 3 )  
SPECIFICATIONS  
K APPA 54A...  
Power Output, 4 ohms:  
Power Output, 2 ohms:  
4 x 50 watts  
4 x 75 watts  
Power Output, Bridged 4 ohms: 2 x 150 watts  
Frequency Response:  
Input Sensitivity:  
20 Hz ~ 20 kHz  
250 mV ~ 9 V  
0.05 %  
THD + Noise (4 ohms):  
Signal-to-Noise:  
> 95 dB  
Maximum Current Draw:  
Dimensions (w x h x l):  
40 A  
16 x 2 3 16 x 81 2 in.  
406.4 x 55.6 x 215.9 mm  
®
©1997, Infinity Systems, Inc., 20630 Nordhoff Street, Chatsworth, CA 91311, USA  
VOICE (818) 407-0228 • FAX (818) 709-9486  
www.infinitysystems.com  
Infinity constantly strives to update and improve existing products, as well as create new ones; therefore, the specifications and construction details in this and related Infinity  
publications are subject to change without notice. Unibloc is a trademark of Infinity Systems, Inc.  
P/ N SH1103 Rev. 2  
8 – Infinity Kappa 54a Power Amplifier  
 

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