Infinity 255a T R O U B L E S H O O T I N G, S P E C I F I C A T I O N S, K A P P A 2 5 5 A

T R O U B L E S H O O T I N G

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
Audio cycles	A protection circuit
off and on;	is turning the

Amber protec- amplifier off and on tion LEDs (on

top panel) are on

Audio cycles	GAIN is set too high
off and on;
Amber protection
LEDs (on top
panel) are on
Fuse blows	Incorrect wiring or
	short circuit

SOLUTION

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)

Set Input Sensitivity correctly (see previous page)

Check connections; refer to Applications (see pages 3 and 4)

S P E C I F I C A T I O N S

K A P P A 2 5 5 A . . .

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 81 ⁄2 in.
	584.2 x 55.6 x 215.9 mm

DBO FREQ Control				DBO Q Control
	(adjusts cut-off		(adjusts boost amount
dB		frequency)	dB	at cut-off frequency)
0			12
-3			6
-6			0
-9			-6
-12	20	80 Freq. (Hz)	-12	20	80 Freq. (Hz)

Figure 8. Frequency response curves show range of Kappa 255a DBO controls.

®

©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.

8 – Infinity Kappa 255a Power Amplifier P/N SH1105 Rev. 2