202a 2-Ch Power Amplifier
Owner’s Manual
Installation Guide
APPLICATIONS
For your convenience, we’ve included several application
diagrams to help you plan your own system installation.
Figures 1 through 3 show how to configure the Kappa 202a
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 202a amplifier
set to stereo to drive a pair of
full-range speakers.
Set Mode Switch
To STEREO
(on top panel)
REM – R +
+
L –
Set Filter Switches
To FLAT
KAPPA 202a
(rear panel)
(on top panel)
-
-
+
+
R Speaker
L Speaker
Figure 2. This wiring
diagram shows a Kappa
BRIDGE (on top panel)
202a amplifier set to
Set Mode Switch To
bridge (mono) to drive a
single subwoofer.
REM – R +
+
L –
Set Filter Switches
(on top panel)
KAPPA 202a
(rear panel)
+
Subwoofer
-
Figure 3. This wiring diagram
shows a Kappa 202a amplifier
set for tri-mode operation. For
a desired crossover frequency,
use the chart to select a low-
pass inductor for the sub-
woofer, and corresponding
high-pass capacitors for left
and right speakers.
Set Mode Switch
To STEREO
(on top panel)
REM – R +
+
L –
Set Filter Switches
To FLAT
R Speaker
L Speaker
KAPPA 202a
FREQUENCY INDUCTOR CAPACITOR
Crossover 6 dB/oct. LP 6 dB/oct. HP
-
(on top panel)
(rear panel)
-
(4 ohm)
(4 ohm)
+
+
Capacitor
Capacitor
75Hz
8.0 mH
6.4 mH
5.0 mH
4.2 mH
3.6 mH
3.2 mH
530 µF
400 µF
318 µF
265 µF
227 µF
198 µF
100 Hz
125 Hz
150 Hz
175 Hz
200 Hz
Inductor
Subwoofer
Owner’s Manual/ Installation Guide – 3
SYSTEM EXPANSION
KAPPA 52a
5 1⁄4" Speakers
-
+
L/R Inputs
Figure 4. In this example
system, a Kappa 52a drives
a pair of 51⁄4" speakers.
The 102a’s stereo low-pass
outputs feed a bridged-
mono Kappa 102a to drive
a single 12" subwoofer.
L/R Outputs
(Low-Pass)
-
+
KAPPA 102a
12" Subwoofer
L/R Inputs
-
+
1" Tweeter
4" Midrange
System
KAPPA 52a
KAPPA 102a
KAPPA 202a
-
+
L/R Inputs
1" Tweeter
4" Midrange
System
Figure 5. In this expanded
system, a Kappa 52a drives
a pair of component
L/R Outputs
(Low-Pass)
systems. The 52a’s low-
pass outputs feed a Kappa
102a to drive a stereo pair
of 6" mid/ bass speakers.
The 102a’s low-pass
outputs feed a bridged-
mono Kappa 202a to drive
a single 12" subwoofer.
-
-
+
+
6" Mid/Bass Speakers
-
L/R Inputs
NOTE: Many different
systems are possible using
the crossover settings on
Kappa amplifiers,
including ones with 24 dB
per octave slopes achieved
through cascaded
+
L/R Outputs
(Low-Pass)
-
configurations. For more
information, consult your
Infinity Car Audio dealer.
+
12" Subwoofer
L/R Inputs
-
+
4 – Infinity Kappa 202a Power Amplifier
PRECAUTIONS AND NOTES
•
The Kappa 202a has five levels of circuit protection
that monitor the amplifier and will shut it down if the
elect r ica l syst em volt a ge dr ops below 10 Vdc or
exceeds 15.5 Vdc, temperatures are above 194° F (90°
C), sh or t cir cu it s occu r , or cu r r en t dr a w exceeds
product specifications. For best performance, check
t h e in t en d ed m ou n t in g s it e t o m a k e s u r e t h e
operating environment does not create conditions that
will trigger circuit protection.
•
•
Always wear protective eyewear when using tools.
The Kappa 202a uses gold-plated, industrial-grade
®
Weco plu g-in con n ect or s for power a n d spea ker
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,
t h ey p r ovid e a d d it ion a l gr ip p in g a r ea for ea s y
connector removal.
•
•
When routing cables, keep input signal cables away
fr om power ca bles a n d ou t pu t spea k er wir es, a s
shown in Figure 6 (below).
•
•
Prior to installation, turn off all audio systems and
ot h er elect r ica l devices. Also discon n ect t h e (–)
negative lead from the vehicle’s battery.
Wh en m a k in g con n ect ion s, m a k e su r e t h a t ea ch
connection is clean and properly secured. Observe the
pola rity ma rkings on the rea r pa nel. 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
AUDIO Cables
Source
Unit
Chassis
Ground
Ignition
Kappa 202a
Amplifier
Battery
LF
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
Th e Ka p p a 202a is ea s y t o in s t a ll. F or op t im u m
performance, we recommend using high-quality, twisted-
pair shielded RCA audio cables and 14-gauge or larger
speaker wire. Also, you’ll 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.
MOUNTING THE AMPLIFIER...
The Kappa 202a can be mounted in virtually any location
i n si d e t h e veh icle. H owever , m a ke su r e t o keep t h e
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 a nd the possibility of overnight stora ge 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. Mou n t t h e a m p lifier a n d s ecu r ely t igh t en t h e
mounting screws.
WIRING THE AMPLIFIER...
PARTS LIST...
Refer to Figure 7 (below) for details of the Kappa 202a’s
E xa m in e a n d ver ify t h a t t h e pa ck a ge in clu des t h e
following items:
front and rear panel connections.
1
1. For power, remote, and speaker wires, strip ⁄4" off
•
•
•
•
•
•
(1) Kappa 202a Power Amplifier
(2) Spare ATC fast-blow fuses (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
one end of each jacket to reveal bare wire for insertion
into the Weco connectors.
2. Usin g t h e Weco 2-pin power con n ect or s, con n ect
individual black wires from the nearest bare-metal
chassis component to each (–) terminal. Then, connect
in dividu a l r ed wir es fr om t h e veh icle’s +12-volt
battery terminal to each (+) terminal.
KAPPA 202a WIRING CONNECTIONS
(front panel)
KAPPA 202a WIRING CONNECTIONS
(rear panel)
Figure 7. Wiring connections for the Kappa 202a amplifier.
6 – Infinity Kappa 202a Power Amplifier
INSTALLATION (continued)
3. Make sure the wires are firmly seated in each Weco
2-pin connector and that each screw is completely
tightened. Insert the wired connectors into the POWER
sockets on the amplifier. Press each one in until it stops.
SETTING INPUT SENSITIVITY...
Initially, turn the input sensitivity GAIN control to its
minimum (counter-clockwise) position (refer to Figure 8).
1. Recon n ect t h e (–) n ega t ive lea d t o you r veh icle’s
battery. Apply power to the audio system and play a
favorite music track from CD or tape.
4. Using the Weco 5-pin connector, connect a blue wire
from the source unit’s 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.
NOTE: After the source unit is on, green LEDs (on the top
pane)l 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.
2. On the source unit, increase the volume control to
maximum position. Slowly increase the GAIN control
(clockwise) towards three o’ clock and, at the same
time, listen to the quality of the reproduced sound. At
some point, you’ll hear distortion on the music peaks.
Stop the adjustment and turn it back slightly.
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.
6. Connect RCA cables from a source unit to the L and R
INPUT jacks.
SETTING DBO...
SETTING THE CROSSOVER...
Dynamic Bass Optimizer (DBO) is a new approach to
en h a n cin g low-fr equ en cy r epr odu ct ion in a veh icle.
Conventional bass boost controls add bass at a fixed
fr equ en cy a n d ca u s e t h e a m p lifier t o con s u m e
considerable power. DBO conserves valuable power at
the lowest frequencies and allows you to adjust the level
and “character” of the bass sound, instead of just the
amount of boom.
IMP ORTANT: If you pla n to u se th e Ka ppa 202a 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”.
1. Set t h e CROSSOVE R con t r ol t o t h e fr equ en cy
recommended by speaker manufacturer (refer to Figure
8). If the value is unknown, set the control midway.
Since a subwoofer in a tuned box is given to overexcursion
below the tuned frequency, set the FREQ control below
the box’s resonant (tuned) frequency (see Figure 9 on the
next page). Power typically wasted in this region will now
be conserved and instead be available for frequencies the
enclosure will reproduce. Use the Q control to boost the
bass at the set frequency by as much as 12 dB (at MAX
position – see Figure 9 on the next page).
For sealed enclosures, use DBO to enhance the output so
it sounds more like a tuned box. This is a result of 12 dB
of rolloff being added to the enclosure’s rolloff and a
flattening of frequency response (at the curve’s knee)
when Q is boosted.
For infinite baffles, set the FREQ control to the speaker’s
Fs value (to keep the subwoofer from trying to create bass
below the resonant frequency) and adjust the Q control
according to personal taste.
INSTALLING THE CONTROL COVER...
After wiring and testing the Kappa 202a amplifier, install
the control cover using the enclosed machine screws to
deter tampering and help seal out dust.
Figure 8. Kappa 202a controls for crossover, input, output, and
DBO (Dynamic Bass Optimizer).
NOTE: Do not over-tighten the machine screws. Doing so may
crack the cover.
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 vehicle’s electrical system is
working properly and power is reaching the Kappa 202a
(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
and/or bass control
See Setting Input
Sensitivity and
Setting DBO
is not set properly
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
KAPPA 202A ...
Power Output, 4 ohms:
2 x 200 watts
2 x 300 watts
DBO FREQ Control
DBO Q Control
(adjusts cut-off
frequency)
(adjusts boost amount
Power Output, 2 ohms:
at cut-off frequency)
dB
0
dB
12
Power Output, Bridged 4 ohms: 600 watts
Frequency Response:
Input Sensitivity:
20 Hz ~ 20 kHz
-3
-6
-9
6
0
250 mV ~ 9 V
0.05 %
THD + Noise (4 ohms):
Signal-to-Noise:
-6
> 95 dB
80 A
19 1 ⁄2 x 2 3 ⁄16 x 81 ⁄2 in.
-12
-12
20
80
Freq. (Hz)
20
80
Freq. (Hz)
Maximum Current Draw:
Dimensions (w x h x l):
Figure 9. Frequency response curves show range of Kappa 202a
DBO controls.
495.3 x 55.6 x 215.9 mm
®
©1996, Infinity Systems, Inc., 20630 Nordhoff Street, Chatsworth, CA 91311, USA
VOICE (818) 407-0228 • FAX (818) 709-9486
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. Dynamic Bass Optimizer and Unibloc are trademarks of Infinity Systems, Inc. Weco is a registered trademark of Weco, Inc.
P/ N SH1104 Rev. 3
8 – Infinity Kappa 202a Power Amplifier
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