Arc Audio KS 125.2 BX² Mini Full Range Amp SKU: KS125.2BX

Regular price $459.99 $399.99


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BX2 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.

These harmonics extend the perceived frequency response up to 1.5 octaves below the speaker cutoff frequency (f3) without perceived distortion, increased peak power consumption, or peak speaker excursion.

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.


  • Compatible Year - All
  • Compatible Model - All
  • Location - All
  • Additional Adapter Required - Yes
  • Modification Required - No
  • Plug & Play - No
  • Works with Electric Lid Locks - N/A


1 year


Very High Level Performance

Road Glide

Street Glide

  • 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).
  • Ultra-Compact Chassis Design Allows For Installation In Small Vehicles And Inside The Factory Fairing Of Most HD Brand Motorcycles.
  • Class G/H Switching Design Allows For Maximum Sound Quality, Performance And Reliability Without Distortion And Lack Of Performance Of Digital Class-D Amplifiers.
  • Designed By Audio Industry Engineer Robert Zeff.
  • Self Branded Ultra-Low ESR Caps And Power Supply Components Allow For maximum Efficiency Without Any Compromise Of Sound Quality Or Long-Term Performance.
  • 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 That Can Happen With Stator Based Charging Systems.
  • Can Drive Highly Reactive Loads Hi-Level Speaker Inputs For OEM Applications And Integration From Most Factory Radios Allowing You To Retain All Of The Factory Steering Wheel/Handle Bar Controls And Features.
  • Optically Isolated Mosfet Power Supply.
  • Stable to 2-Ohms Stereo.
  • Ultra-Low Radiated Noise for Clean AM/FM/ Reception


  • KS Mini Amplifier Manual Download Product Manual Here
  • KS 125.2 Mini Product Review Download Product Review Here
  • 2- Channels @ 4 Ohms 70 Watts
  • 2-Channels @ 2 Ohms 125 Watts
  • 1-Channel @ 4 Ohms (Bridged) 250 Watts
  • Frequency Response 5Hz - 20kHz
  • Crossover Range 50Hz - 550Hz
  • Bass Boost No
  • S/N Ratio 101dB
  • Input Sensitivity (Low) 170mV - 3.5V
  • BX2 Technology (Bal) Yes
  • Fuse 170mV - 3.5V
  • Dimensions 8.25"(L) x 4.8"(W) x 1.7"(H)

What's Included

  • 1 KS 125.2 amplifier
  • All hardware
  • Owner's Manual