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Infinity Kappa Five

5-channel amplifier — 50 watts RMS x 4 at 4 ohms + 300 watts x 1 at 2 ohms

11 Reviews | 2 questions - 2 answers

Item # 108KAPPA5V

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Our take on the Infinity Kappa Five

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 Five 5-channel amplifier makes an ideal match for your high-performance Kappa speakers and subwoofer, dispensing 50 watts of clean power per channel to four full-range speakers, plus up to 300 watts to a subwoofer. A built-in crossover and input selector switch lets you configure your setup for the best possible performance, while the amp's Dynamic Bass Optimization circuit shapes the bass to get the best possible performance from your sub and enclosure.

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.

I don't know much about this stuff. I paid a pro to put a stereo in my truck that would make me happy. JDK sound and Security, recommended this amp with a Kicker 10" sub and Infinity Kappa speakers. I am very happy with it after about six months now. Really hits hard and clean!

Leggo, Newton, Ma.

What's in the Box:

  • 5-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

Product Highlights:

  • 5-channel amplifier
  • 50 watts RMS x 4 + 200 watts RMS x 1 at 4 ohms
  • 75 watts RMS x 4 + 300 watts RMS x 1 at 2 ohms
  • 150 watts RMS x 2 bridged + 200 watts RMS x 1 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: 10-75000 Hz (front and rear); 15-320 Hz (subwoofer)
  • 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 14-3/16"D
  • warranty: 3 years
  • Our 60-day money-back guarantee

Infinity Kappa Five Reviews

Average Customer Review(s):

(11 Reviews)
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Class D/DirectFET Technology: The Infinity Kappa Five 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.

5-Channel Design: This amplifier is designed to power four full-range speakers and a subwoofer simultaneously. All five channels are 2Ω stable; at 2Ω the power output is 75 watts RMS x 4 to the full range channels plus 300 watts RMS to the subwoofer channel. 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 5, 4, or 3 channels. When bridged, the front and/or rear channel output is 150 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.


Rear Input Signal Select: set to 2 CH or 4 CH, based on how many line outputs from the head unit are feeding the front and rear channels

Subwoofer Input: 1 pair of RCA inputs

Input Select Switch: set to INT or EXT, based on whether the head unit has a discrete subwoofer line output

Input Level: 3 rotary controls match the level of the preamp input signals for front, rear, and sub channels; 200mV to 6V

Crossovers: The Kappa Five has 12 dB per octave crossovers on all the outputs. Each is continuously variable from 32-320 Hz. The crossover on the sub output is low-pass only. The crossovers on the front and rear outputs are independently set to low-pass, high-pass, or full range.

  • Frequency: 3 rotary controls set the crossover points for the front, rear, and sub 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 (the sub channel crossover is always low-pass)

Dynamic Bass Optimization (DBO): The Dynamic Bass Optimizer (DBO) is used to enhance low frequency reproduction in your vehicle. Conventional bass-boost circuits only increase bass at a fixed frequency, and cause the amp to consume considerable power. The DBO allows you to adjust the frequency, as well as the boost level (up to 12dB), allowing you to fine-tune the bass in your system to optimize performance. The frequency control also acts as a subsonic filter.

  • HP Freq: Rotary control to set the sub-sonic filter and boost frequency; 10-80 Hz
  • Boost: Rotary control to set the boost level; 0-12 dB


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 4 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 4 gauge wire

Front and Rear Channel Inputs: 2 pair 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: 10 Set screw terminals (5 pair) for connecting speaker wires; handles up to 8 gauge; front left, front right, rear left, rear right, and sub.

Fuses: 2 Slots for 40A fuses (installed)

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Q & A

Customer Q&A

2 questions already asked

If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center: [ Krissy  Apr 27, 2014 ]  Staff