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8 – Infinity Kappa 255a Power Amplifier
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 255a
(i.e., green LEDs on the top panel are on).
SYMPTOM LIKELY CAUSE SOLUTION
No audio Low /No Remote Check connections;
Turn-On Voltage test turn-on voltage
Speakers are not Check wiring; use
connected or are VOM/DVM to
blown measure speaker
coil impedance
Distorted audio Input sensitivity See
Setting Input
is not set properly Sensitivity on
previous page
Audio lacks Speakers are wired Check polarity of
“punch” with wrong polarity connections; refer to
Applications (pages 3
and 4)
SYMPTOM LIKELY CAUSE SOLUTION
Audio cycles A protection circuit Verify the following–
off and on; is turning the electrical system is
Amber protec- amplifier off and on between
10 ~ 15.5
Vdc;
tion LEDs (on temperature is not
top panel) are on over 194°F (90°C);
no short circuits;
speaker loads are not
less than 1 ohm
(2 ohms in mono)
Audio cycles GAIN is set too high Set Input Sensitivity
off and on; correctly (see previous
Amber protection page)
LEDs (on top
panel) are on
Fuse blows Incorrect wiring or Check connections;
short circuit refer to Applications
(see pages 3 and 4)
©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. Dynamic Bass Optimizer and Unibloc are trademarks of Infinity Systems, Inc. Weco is a registered trademark of Weco, Inc.
®
P/N SH1105 Rev. 2
SPECIFICATIONS
-9
-6
-3
0
-12
20 80
Freq. (Hz)
dB
DBO FREQ Control
(adjusts cut-off
frequency)
-6
0
6
12
-12
20 80
Freq. (Hz)
dB
DBO Q Control
(adjusts boost amount
at cut-off frequency)
Figure 8. Frequency response curves show range of Kappa 255a
DBO controls.
TROUBLESHOOTING
KAPPA 255A...
Power Output, 4 ohms: 4 x 50 and 1 x 200 watts
Power Output, 2 ohms: 4 x 75 and 1 x 300 watts
Power Output, Bridged 4 ohms: 2 x 150 and 1 x 200 watts
Frequency Response: 20 Hz ~ 20 kHz
Input Sensitivity: 250 mV ~ 9 V
THD + Noise (4 ohms): 0.05 %
Signal-to-Noise: > 95 dB
Maximum Current Draw: 80 A
Dimensions (w x h x l): 23 x 2
3
⁄16 x 8
1
⁄2 in.
584.2 x 55.6 x 215.9 mm