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Infinity Kappa Four

4-channel amplifier — 125 watts RMS x 4

Item # 108KAPPA4

Infinity designed the latest Kappa Series amplifiers to deliver increased efficiency and performance from an...

Find what Fits your car

Infinity designed the latest Kappa Series amplifiers to deliver increased efficiency and performance from an...

Discontinued item

Item # 108KAPPA4

About the Infinity Kappa Four

Infinity designed the latest Kappa Series amplifiers to deliver increased efficiency and performance from an extremely compact package. These slim powerhouses stand only 1-3⁄4" tall, so they'll fit easily in spaces where other amps just won't go. And efficient heat dissipation means these amps won't get too hot in tight quarters.

Infinity designed the latest Kappa Series amplifiers to deliver increased efficiency and performance from an extremely compact package. These slim powerhouses stand only 1-3⁄4" tall, so they'll fit easily in spaces where other amps just won't go. And efficient heat dissipation means these amps won't get too hot in tight quarters.

The Kappa Four 4-channel amplifier makes an ideal match for your high-performance Kappa speakers, dispensing 125 watts of clean power per channel. You can also bridge the amp to 2-channel mode, sending 300 watts each to a pair of subs. A built-in crossover and input selector switch let you configure your setup for the best possible performance.

The amp's Class-D design generates less heat, eliminating the need for large heatsinks. Non-stop Thermal Protection circuitry adjusts the amp's output so it runs cool no matter how hard you push your system. Balanced speaker-and preamp-level inputs reject engine whine and other noise from your car's electrical system. A unique detachable power/ground plug lets you connect and disconnect large-gauge power cables in one easy step.

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Product highlights:

  • 4 channel amplifier
  • 125 watts RMS x 4 at 4 ohms (150 watts RMS x 4 at 2 ohms)
  • 300 watts RMS x 2 bridged at 4 ohms
  • CEA-2006 compliant
  • variable high- and low-pass filters (32-320 Hz, 12dB per octave)
  • bass boost: 0-12 dB
  • frequency response: 10 Hz to 75 kHz
  • Non-stop Thermal Protection ciruitry
  • Class-D amplifier design
  • differential balanced speaker-and preamp-level inputs
  • 4-gauge power and ground leads and a 80-amp fuse recommended — wiring and hardware not included with amplifier
  • fuse rating: 40A x 2
  • 7-1/16"W x 1-3/4"H x 14-5/8"D
  • warranty: 3 years
  • Our 60-day money-back guarantee
  • MFR # Kappa Four

What's in the box:

  • 4-Channel amplifier
  • Two 40A ATO fuses
  • 4-Gauge terminal adapter (installed)
  • Instructions (English/ German/ French/ Spanish/ Dutch/ Italian/ Swedish/ Danish/ Finnish/ Polish/ Portuguese/ Russian)
  • Warranty/Product Registration card

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Features
Controls
Connections

Features

Class D/DirectFET Technology: The Infinity Kappa Four features high-power Class D circuit topology with DirectFET transistors, a design that increases power output and overall efficiency, with improved heat transfer from the transistors to the chassis.

CEA-2006 Compliance: The specifications given by Infinity for the Kappa Five comply with the CEA-2006 Amplifier Power Standard from the CEA (Consumer Electronics Association). All manufacturers who comply with the standard can display the CEA-2006 logo on their product.

4-Channel Design: This amplifier is designed to power four full-range speakers. All four channels are 2Ω stable; at 2Ω the power output is 150 watts RMS x 4. CEA-2006 compliance is maintained at 2Ω, with less than 1% THD+N. The amplifier's front and rear channels are individually bridgeable, so the Kappa Five can run 4, 3, or 2 channels. When bridged, the front and/or rear channel output is 300 watts RMS into 4Ω.

Protection Circuitry: The amp features protection circuits and will shut itself down in the following cases:

  • DC Output: DC voltage is detected on the amplifier output
  • Over/Under Voltage: Voltage at the +12V (Battery) terminal is too high or too low
  • Short Circuit: Short circuit in speaker or speaker wire

Non-Stop Thermal Protection: Kappa amps protect themselves against excess heat with circuits that cool the amplifier down by gradually reducing output, instead of shutting down completely.

Status LEDs: Three LEDs on top of the chassis indicate the status of the amplifier. Two Power LEDs indicate the amplifier is on. The Protection LED indicates one of the protection circuits has engaged.

Controls

Front Input Select:

  • Front/Rear: choose which inputs feed this side of the amp (no Y-adapters needed when using only one input)

  • Stereo/Left/Right: choose stereo, or which channel is output when this side of the amp is bridged

Rear Input Select:

  • Front/Rear: choose which inputs feed this side of the amp (no Y-adapters needed when using only one input)

  • Stereo/Left/Right: choose stereo, or which channel is output when this side of the amp is bridged

Input Level: 2 rotary controls match the level of the preamp input signals for front and rear channels; 200mV to 6V.

Crossovers: The Kappa Four has independent 12 dB per octave crossovers on the front and rear outputs. Each is continuously variable from 32-320 Hz and selectable; low-pass, high-pass, or full range.

  • Frequency: 2 rotary controls set the crossover points for the front and rear channels; continuously variable from 32-320 Hz.
  • Crossover Switches: 2 switches set the front and rear crossovers to low-pass, high-pass, or full range.

Bass Boost: The Bass Boost control allows you to enhance the bass output from the rear channels; 0 to 12 dB at 50Hz.

Connections

Power: A 4-Gauge terminal adapter is installed on the power/ground/remote terminals; if removed, it reveals three 8 gauge set screw terminals (Infinity recommends 4 gauge power and ground when the power cable is more than 4 feet)

  • +12V: Set screw terminal for power wire from battery; handles up to 2 gauge wire
  • Remote: Set screw terminal for remote turn-on lead; handles up to 12 gauge wire
  • Ground: Set screw terminal for ground; handles up to 2 gauge wire

Front and Rear Channel Inputs: 2 pairs of RCA inputs. The amp will accept a speaker level signal through the RCA inputs. A speaker wire to RCA adapter is needed (136XDCLR2S, sold separately).

Speaker Output: 8 set screw terminals (4 pair) for connecting speaker wires; handles up to 8 gauge; front left, front right, rear left, and rear right.

Fuses: 2 Slots for 40A fuses (installed).

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