Infinity Kappa KP5004A 4-Channel Amplifier SKU: KP5004A



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Product Description

Big clean power and unbeatable reliability. This Ultra compact aluminum chassis amplifier with conformal coated PCB board combined with waterproof connections make this amplifier ideal for the Harley harsh condition environment. This amplifier has the perfect amount of power for Infinity and other speaker systems. Selectable internal crossovers make this the perfect amplifier for use with or without a DSP.

About Plug and play connections option

Speaker Outputs

We offer an optional plug and play configuration that terminates all speaker outputs with 4 pin Molex connectors that are plug and play with American Hard Bag and Velocity speaker wire harnesses. This is also the same Molex plug that Harley uses as the rear speaker output from the factory radio, so this connection is also compatible with any factory supplied speaker wire harness that mates with the factory radio output. 

Compatible Plug & Play Speaker Wire Harnesses Required for Installation (sold separately). 

VWH-FPOD Upper fairing speakers

WH-SBB2-PNP Rear speakers (lids) 

VWH-4CHSBB 4 Channel rear speakers (lids with active tweeters), also compatible with Velocity 8 DSP

VWH-TPSBB 4 Channel rear speakers (tour pack with active tweeters), also compatible with Velocity 8 DSP

Remote Turn On Input

We also terminate the remote input so that it is plug & play with the factory Harley accessory circuit in the fairing as well as all American Hard Bag, Musway, and Velocity DSP remote output harnesses.

With the plug & play option it is entirely possible to do a complete amplifier installation without ever cutting a single wire. 


  • All years and models of Harley baggers
  • Plug and play option only available for 2014 and later Road Glide, Street Glide, Electra Glide & Ultra Limited
  • Plug and Play rear speaker outputs may require additional adapters on factory amplified bikes and Ultra models


  • 1 Year Limited


Water Proof

Very High Level Performance

Road Glide

Street Glide

Why We Like This Amplifier

  • Fits all Harley Bagger fairings of all years
  • Waterproof
  • Very nice sounding and powerful
  • SImplified installation when optional plug & play kit is used
  • Industrial design will not fail on the road even in the harshest conditions
  • Very simple installation and setup


  • RMS Power Output @ 4Ω (Watts x Channels): 75 x 4
  • RMS Power Output @ 2Ω (Watts x Channels): 125 x 4
  • RMS Power Output Bridged into 4Ω (Watts x Channels): 250 x 2
  • Minimum Impedance Bridged: 4
  • Minimum Impedance Unbridged:2
  • Frequency Response at Rated RMS Power: 20-20kHz
  • Signal to Noise Ratio: 75 dB
  • Amplifier Class: D
  • Low-Pass Crossover Frequency: 60, 80, 120 Hz
  • Low-Pass Slope (dB/octave): 12 dB/octave
  • High-Pass Crossover Frequency: 60, 80, 120 Hz
  • High-Pass Slope (dB/octave): 12 dB/octave
  • Bass Boost: No
  • Bass Boost Frequency: N/A
  • Fan Cooled: No
  • Fuse Rating: 40
  • Speaker Level Inputs: Yes
  • Preamp Outputs: No
  • Height (inches): 1-3/4
  • Width (inches): 11
  • Depth (inches): 3-5/16
  • Parts Warranty: 1 Year
  • Labor Warranty: 1 Year

What's Included

  • 4-Channel amplifier with attached 6.5" input harnesses and 8.5" power/ground & output harnesses (inline 40A ATO fuse)
  • 2 Cover plates
  • Spare 40A ATO fuse
  • Four 5/8" screws
  • Four 4mm counter-sunk screws
  • Four 6" wire ties
  • 2 Decals
  • QR Codes for owner's manual (En/ Sp/ Fr)
  • Safety instructions

What's Not Included

  • Plug & play connections for power and speaker output are optional and must be selected before adding to cart. 
  • Additional RCA input cables or Harley specific radio signal adapters may be required depending on your bike.