® 255a 5-Ch Power Amplifier FRONT x15 x1 32Hz 320Hz LP HP FLAT 9V G C A R I O .25V N S S O 32Hz V M E BR O R D 320Hz O ST E LP U T HP P FLAT U T 50W X 4 + 200W CLASS D DIGITAL SUBWOOFER AMPLIFIER REAR SUBWOOFER 9V G 9V G C A R I O .25V N .
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.
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. 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. –R+ – Figure 1.
APPLICATIONS (continued) Figure 3. This wiring diagram shows a Kappa 255a amplifier driving a front set of tweeter/midrange components, a rear pair of midbass speakers, and a single subwoofer. –R+ – Set Switches As Shown KAPPA 255a (set controls for your system plan) FRONT x15 x1 32Hz 320Hz LP HP FLAT REAR 9V G C A R I O .25V N S S O 32Hz V M E BR O R 320Hz D O ST E LP U T HP P FLAT U T (front panel) SUBWOOFER 9V G 9V G C A A R I I O .25V N .
PRECAUTIONS AND NOTES • The Kappa 255a 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.
INSTALLATION The Kappa 255a is easy to install. For optimum performance, we recommend using high-quality, twistedpair shielded RCA audio cables and 14-gauge or larger speaker wire. Also, you’ll need a minimum of 10-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...
INSTALLATION (continued) 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 (see Figures 1 through 3 on pages 3 and 4), connect speaker wires from the subwoofer(s) to the L and R (+ and –) terminals, as required by your system plan. 5. Make sure the wires are firmly seated in the Weco 5-pin connector and that each screw is completely tightened.
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 255a (i.e., green LEDs on the top panel are on).
