Infinity 255a User Manual
®
50w x 4 + 200W x 1
255a
ST
BR
HP
FLAT
LP
.25V
9V
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.25V
9V
.25V
9V
80Hz
20Hz
320Hz
32Hz
60
Hz
Q
FREQ
REAR
INPUT
SUB
INPUT
MIN
MAX
320Hz
32Hz
320Hz
32Hz
HP
FLAT
LP
FRONT LP
EXT
INT
EXT
ST
BR
SUBWOOFER
FRONT REAR
50W X 4
+
200W CLASS D
DIGITAL SUBWOOFER
AMPLIFIER
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255a 5-Ch Power Amplifier
Owner’s Manual
Installation Guide
DECLARATION OF CONFORMITY
We, Infinity Systems A/S
Kongevejen 194B
DK-3460 Birkerød
DENMARK
declare in own responsibility, that the product described in this
owner’s manual is in compliance with technical standards
EN 55013/A12/8.1994 and EN 55020/12.1994.
Steen Michaelsen
Infinity Systems A/S
Birkerød. DENMARK. 3/97
KAPPA 255A POWER AMPLIFIER
The Kappa 255a is a member of Infinity’s new Kappa series
of mobile power amplifiers. Housed within the sleek,
extruded aluminum frame, you’ll find five channels of
amplification – four for full-range, midrange, or highfrequency reproduction and a 200 watt class-D channel to
efficiently power a subwoofer. This unique “hybrid”
amplifier features a flexible integrated crossover so you can
easily configure the Kappa 255a for a front, rear, and
constant bass system, or for a three-way system with
separate midbass or tweeters.
ABOUT THE WARRANTY...
You’ve selected a premium product that offers superior
performance and advanced materials, resulting from over
25 years of car audio design.This Infinity product is made
with our ongoing dedication to creating the best consumer
audio products possible. As a result, you can expect your
new Kappa Power Amplifier to provide you with many
years of listening enjoyment.
All Infinity Automotive Products carry a limited parts and
labor warranty (see the enclosed warranty card), so retain
KAPPA 255A AMPLIFIER FEATURES...
The Kappa 255a is a 5-channel power amplifier that offers
the bill of sale to protect your purchase and to aid us with
any service-related questions you may have.
full-range stereo and bridged-mono operation on four
analog channels and band-limited mono operation on a
class-D channel for subwoofer applications. The front/rear
amplifiers are rated at 50 watts (rms) per channel into a 4ohm load, while the subwoofer channel is rated at 200 watts
(rms) into a 4-ohm load. In bridged-mono configurations,
front and rear amplifiers can deliver up to 150 watts (rms)
for the same load. The Kappa 255a also features:
• 2-ohm operation, rated at 75 watts (rms) per channel for
front and rear channels and 300 watts (rms) for the
subwoofer channel
• Bridge/stereo switches for fast system setup
• Built-in 12 dB-per-octave electronic crossovers, variable
from 32 to 320 Hz, with an “x15” front-channel switch (to
increase the frequency range from 480 Hz to 4.8 kHz)
ABOUT THIS MANUAL...
To attain maximum amplifier performance, we encourage
you to read the remaining pages before installing and
operating your new Infinity Kappa Power Amplifier.
Especially review the Applications section (on the next two
pages) for ideas on designing a system. Also, save these
instructions for future reference.
IMPORTANT: Installation of automotive stereo components can require extensive experience in performing a
variety of electrical, and mechanical procedures. Although
these instructions explain how to install a Kappa Power
Amplifier in a general sense, they do not show the exact
installation methods for your particular vehicle. If you do
not have the experience, do not attempt the installation
yourself; instead ask your Authorized Infinity Car Audio
Dealer about professional installation options.
• Dynamic Bass Optimizer™ (DBO) 12 dB-per-octave
subsonic filter with variable frequency (20 to 80 Hz) and
Q for enhancing subwoofer low frequencies while
conserving amplifier power
• Front and rear channels, individually selectable as highpass, low-pass, or through-pass
• External switch for subwoofer inputs allows direct
connection to source units with subwoofer outputs
• Amplifier input sensitivity controls to match a wide
range of input signal levels from 250 mV to 9 V
• Five protection levels guard against over-voltage, undervoltage, over-power, over-temperature, and over-current
situations
• 2-color LED array indicates green when power is on and
TABLE OF CONTENTS...
Applications ..................................................3
orange when protection is activated
• Industrial-grade, gold-plated, “pre-wire and plug-in”
System Expansion...........................................4
connectors for an easy-to-install high-quality interface
• Transparent control cover to deter tampering yet provide
a clear view of installation settings
• Built-in automotive type fuses to protect the amplifier
• Unibloc™ chassis provides improved heat-sink capacity
and exceptional RFI shielding characteristics
Precautions And Notes .....................................5
Installation ...................................................6
Troubleshooting..............................................8
2 – Infinity Kappa 255a Power Amplifier
R
– ––
+ ++
L
R
– –
+ +
L
KAPPA 255a
(front panel)
KAPPA 255a
(rear panel)
REM
–
R
+–+
L
SUBWOOFER 1 and 2
are common outputs
and are supplied as
a convenience for
dual-subwoofer
applications
Subwoofer
LR
-
+
+
-
+
-
RRLF
+
-
RF
+
-
ST
BR
HP
FLAT
LP
.25V
9V
G
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M
O
D
E
M
O
D
E
O
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P
U
T
C
R
O
S
S
O
V
E
R
.25V
9V
.25V
9V
80Hz
20Hz
320Hz
32Hz
60
Hz
Q
FREQ
REAR
INPUT
SUB
INPUT
MIN
MAX
320Hz
32Hz
320Hz
32Hz
FRONT LP
EXT
INT
EXT
ST
BR
SUBWOOFER
FRONT REAR
O
U
T
P
U
T
C
R
O
S
S
O
V
E
R
D
B
O
X
O
V
E
R
HP
FLAT
LP
x1
x15
Set Switches As Shown
(set controls for your system plan)
Set to EXT for
source unit with
subwoofer outputs
KAPPA 255a
(top panel)
R
– ––
+ ++
L
R
– –
+ +
L
KAPPA 255a
(front panel)
KAPPA 255a
(rear panel)
REM
–
R
+–+
L
+
-
+
-
LF
Tweeter
+
-
RF
Tweeter
RR
Mid
LR
Mid
+
-
+
-
Subwoofer
(4 Ω min.)
Subwoofer
(4 Ω min.)
+
-
ST
BR
HP
FLAT
LP
.25V
9V
G
A
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A
I
N
M
O
D
E
M
O
D
E
O
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T
P
U
T
C
R
O
S
S
O
V
E
R
.25V
9V
.25V
9V
80Hz
20Hz
320Hz
32Hz
60
Hz
Q
FREQ
REAR
INPUT
SUB
INPUT
MIN
MAX
320Hz
32Hz
320Hz
32Hz
FRONT LP
EXT
INT
EXT
ST
BR
SUBWOOFER
FRONT REAR
O
U
T
P
U
T
C
R
O
S
S
O
V
E
R
D
B
O
X
O
V
E
R
HP
FLAT
LP
x1
x15
Set Switches As Shown
(set controls for your system plan)
Set to EXT for
source unit with
subwoofer outputs
FRONT LP creates
bandpass when rear
output is set to HP
KAPPA 255a
(top panel)
APPLICATIONS
Enclosed are several diagrams to help you plan your own
system installation. Figures 1 through 3 (on pages 3 and 4)
show how to configure the Kappa 255a to drive front and
rear speakers and a subwoofer, tweeters and midrange
speakers and a pair of subwoofers, and a tweeter/midrange
component set, midbass speakers, and a subwoofer.
Figure 1. This wiring diagram shows
a Kappa 255a amplifier driving front
and rear pairs of full-range speakers
and a single subwoofer.
For system expansion, see Figure 4 on the next page.
NOTE: For simplicity, Figures 1 through 4 do not show power,
remote, and input connections.
Figure 2. This wiring diagram shows a
Kappa 255a amplifier driving a pair of
tweeters, a pair of midrange speakers,
and a pair of subwoofers (4 Ω minimum).
Owner’s Manual/Installation Guide – 3
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