Infinity Kappa 255A, Service Manual

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FEATURES
The Kappa 255a is a 5-channel power amplifier that offers 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
4-ohm 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.
· 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)
· 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 orange when protection is
activated
·
Industrial-grade, gold-plated, “pre-wire and plug-in” 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