Hertz-Arc Speaker Amplifier Combo for Street Glide MPK165-KS125.2 SKU: C-14HZAA-SG165KS



Free System Design Call Now 1(888)311-0016

Big Plug & Play Sound for Your 2014+ Harley Street Glide
Ready for a compact and powerful system for your Harley? We’ve got you covered with our new Hertz-Arc Audio Combo that fits all 2014+ Street Glides. This combo boasts spectacular out of the box sound without requiring complex tuning, a fuller-sounding bottom end than pro audio type speakers, and silk dome tweeters that have better sound quality than horn-type speakers. Best of all, it has bolt-in, drop-in fitment!

Arc Audio’s KS 125.2 Full Range Mini Amplifier has a bass frequency extension technology that provides increased perceived bass frequency response below the low-frequency cut-off in an audio system. BX2 uses the principle of the missing fundamental, which creates the sensation of low frequencies by generating a carefully calculated series of harmonics designed to simulate the auditory experience in the human ear caused by the missing fundamental pitch. 

When paired with the MPK 165.3 Speaker Upgrade Kit from Hertz, you have a system that produces crisp highs and beefy lows, clear enough to hear at high speed running down the freeway.


  • 2014 and later Street Glide, Electra Glide and Ultra
  • Speakers are plug and play
  • Amplifier requires either an RCA input signal (DSP or aftermarket radio) or a custom Arc Audio specific signal harness can be ordered that is plug and play to your factory Harley radio. Call to order custom harness 1(888) 311-0016.


  • Hertz Audio Components: 1 Year
  • Arc Audio Components: 1 Year
  • American Hard Bag Components: 5 Years


Water Resistant

Very High Level Performance

Street Glide

What's Included

  • (1) Hertz MPK 165.3 Speaker Upgrade Kit
  • (1) Arc Audio KS 125.2 BX² Mini Full Range Amp
  • All Applicable Manuals and hardware

MPK 165.3

Product Overview

Step into high-volume sound with smooth silk dome tweeters. This speaker kit is designed to fit under your factory speaker grills and does not require any modification to your speaker pods or your bike's wire harness. This speaker upgrade kit is perfect for anyone who has extremely high sound quality expectations but still wants to be able to play loud. 

Technical Specifications

  • Power Handling - 220w
  • Continuous Power - 110w
  • Impedance - 4ohm
  • Frequency - 40 ÷ 22,5k
  • Sensitivity dB SPL - 92
  • Voice Coil - 25 (1)
  • Woofer Size - 6.5"
  • Tweeter Size - 1.14"
  • Crossover Type - 2 Way Passive Crossover
  • Crossover Cutoff - 3,5 kHz


  • V-cone® and Boundary Free Surround technologies
  • Dedicated crossover MPCX 2.3 designed to exploit the wide extension of the  MP 165.3 woofers
  • 1mm low parasitic resistance copper filter coil
  • High-density flux ferrite woofer magnet
  • Neodymium tweeter magnet
  • Pressed-pulp cone with cotton fibers woofer cone
  • Tetolon tweeter cones

Arc Audio KS 125.2 BX²

Product Overview

BX2 technology allows the system user to experience dramatically improved levels of system performance, sound quality, and improved low-frequency response by:

  • Increasing low-frequency output and performance without causing the speakers to perform outside their physical design limitations.
  • Decreasing power consumption during low-frequency reproduction up to 75%.
  • Allows small format speakers to reproduce low frequencies traditionally designed for larger speakers.

Technical Specifications

  • 2- Channels @ 4 Ohms - 70w
  • 2-Channels @ 2 Ohms - 125w
  • 1-Channel @ 4 Ohms (Bridged) - 250w
  • Frequency -5Hz - 20kHz
  • Crossover Range - 50Hz - 550Hz
  • S/N Ratio - 101dB
  • Input Sensitivity - 170mV - 3.5V
  • Fuse - 1 x 30 Amp
  • Dimensions - 8.25"(L) x 4.8"(W) x 1.7"(H)


  • The KS125.2BX Mini Exclusively Incorporates ARC Audio’s BX2 Low-Frequency Enhancement Technology. The BX2 Technology Gives You Big Bass And Improved Low-Frequency Response Without The Additional Physical Demand On Your Speakers.
  • The KS125.2BX Mini Uses A High-Velocity Forced Induction Fan For Additional Cooling.
  • Bridge Auto Detect Mode (Autosense Turn On).
  • Class G/H Switching Design 
  • Protection Against: Reverse Voltage, Speaker Short, And Thermal Overload.
  • Wide Band Over Voltage Protection Allows For Continued Use Without Interruption From Very High Voltage Spikes
  • Optically Isolated Mosfet Power Supply.
  • Stable to 2-Ohms Stereo.
  • Ultra-Low Radiated Noise for Clean AM/FM/ Reception

Fairing Mounted Amplifier Power Kit

Product Overview

This powerful amplifier kit comes complete with all the cabling, speaker wires, terminals, disconnects, and fuse blocks needed to perform a quality installation, except for RCA interconnects.


  • Waterproof eight gauge fuse holder that uses MIDI-style fuses
  • Fuse holder is compact and very friendly to mount
  • Comes with a large hook and loop mounting pad
  • Includes load resistors to prevent distortion and damage