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Hertz-Arc Speaker Amplifier Combo for Road Glide MPK165-KS125.2


Ultimate Sound in a Compact Design with High Power Speakers and Amp For All 2015 and Newer Road Glides

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 2015+ Road 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.

This combo comes with an installation kit and everything you need to upgrade your Harley's sound system.

Flash Your Own Radio

This combo is available with an optional radio flash tool that allows you to flash your own radio unlimited times. Licensed for a single bike (VIN locked) and you can add as many additional bikes as you like for $49

Hertz MPK 165.3 Speaker Upgrade Kit

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. 


  • 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 Mini Full Range Amp

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.


  • 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

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

Specifications: Speakers

  • 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

    Specifications: Amplifier

    • 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)


    • 2015+ Road Glide
    • Speakers Fit Under Factory Speaker Grills for a Totally Stealth Installation

    What's in the Box?:

    • (1) Hertz MPK 165.3 Speaker Upgrade Kit
    • (1) Pair Road Glide Specific Tweeter Mounting Brackets
    • (1) Arc Audio KS 125.2 BX² Mini Full Range Amp
    • All Applicable Manuals and hardware


    Usually ships in 1 to 3 business days. We process and build orders in the order in which they are received. This allows our experts to review every order and check that it is correct for your specific bike. This means sometimes you might wait a little longer to receive your order but it's always worth it!


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


    Shipping This Item Ships to The United States 

    Items built to order have a build time of up to two weeks before shipping. Items that are not built to order (e.g. amplifiers, speakers, .etc) typically ship in 2 - 3 business days. Many of our speaker kits feature machined special parts and customized wire harnesses that are built to order. We process and build orders in the order that we receive them. This allows our experts to go over every order and check that your particular order is correct for your particular bike. This means sometimes you have to wait a little longer to get your order but it's always worth it! 

    Once You Order Does Ship

    You will receive an automated email with tracking information as soon as our shipping department creates a shipping label for your package.  


    There are many more speakers, amplifiers, and kits to choose from than what you see here.

    [powr-form-builder id=1f43a15c_1475460501]

    Please allow 10 business days for your order to arrive if it is an item that is built to order. Items that are not built to order (e.g. amplifiers, speakers, .etc) typically ship the next business day.We process and build orders in the order that we receive them. This allows our experts to go over every order and check that your particular order is correct for your particular bike. This means sometimes you have to wait a little longer to get your order but it's always worth it! 

    Returns are easy, simply contact us for a returns number and send your item to our returns centre for fast processing. We'll get you a replacement or refund in a snap! You can find our refund policy here.

    Here are 5 great reasons to buy from us:



    Easy Returns

    Returns are easy, simply contact us for a return Authorization number and send your item to our returns center for fast processing. We'll get you a replacement or refund in a snap! You can find our refund policy here.



    Your part is guaranteed to fit. We test fit every part we sell on actual bikes in order to verify fitment on each model, generation, and in each possible location. You can be sure that if we have stated that a part fits your bike, that it will, or your money back. You will find model, year, and location fitment details on most product pages.

    Secure Ordering


    Ordering from American Hard Bag is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either.



    We Thoroughly Test Every Part We Sell on a Real Bike. There are a lot of parts out there that we refuse to sell. If it’s not up to our high standards, it never makes it to this website. We have parts that fit various budgets and levels of insanity, but all parts we carry are exceptional performers.



    Because We Are Fully Authorized Retailers for All Brands We Sell, Manufacturers Warranties Are 100% Valid. There are only a select few authorized online retailers for the brands that we sell. Most all online retailers (even the really big ones) are not authorized at all! And the manufacturer's warranty is void before you even get your items.

    Easy as 1 - 2 - 3!

    We have 3 great financing options for you. Snap Financing, Installment Payments, and Split Pay. Learn more below.

    No Credit Financing

    12-18 months

    4 Payments

    Did you know - you can check your eligibility with all 3 options without negatively impacting your credit?


    Questions? Call us at 888-311-0016

    Financing with Snap!

    Get Approved

    Could get approved for a lease purchase agreement of up to $3,000

    *minimum finance $450

    Instant Access

    Get instant ACCESS to your financing upon approval


    Get shopping! Snap lease-to-own financing lets you get what you need, when you need it.

    • 100 days same as cash - $0 in fees if paid off within 100 days
    • No hidden fees
    • No interest
    • No application fee
    • No credit needed and no hard credit inquiry - Bad credit/No credit OK!
    • High credit limits
    • 80% approval rate - All you need is a job making $1200 or more, be 18+ years old, and have an active checking account.
    • Snap doesn't offer traditional loans. Instead, we offer a consumer lease that allows you to finance the merchandise over 12-18 months of convenient payments. We also offer a 100-Day payment option, the best terms around. Need new tires for your car? Or new furniture for your growing family? Don't let bad credit stand in your way. Snap is your partner for fast and easy lease-purchase financing.
    • No Credit Needed refers to Snap’s lease-purchase financing that considers more than just credit reports to determine approvals or denials. In fact, applications for Snap’s lease-purchase financing aren’t even reported to TransUnion, Equifax, or Experian. Our proprietary decisioning process allows us to look beyond bad credit, no credit, and bankruptcy to approve more applicants.

    See what you qualify for without impacting your credit.


    Questions? Call us at 888-311-0016

    Financing with Bread

    Shop Online
    Select Pay Over Time with Bread at checkout

    Choose your plan - Easy Installments or Split Pay with your card of choice

    Get your item now and pay over time!
    It's that easy!

    1. Simple transparent terms. No prepayment penalties. No deferred interest.
    2. Applying is easy. All we need is a few pieces of information and you get a decision in seconds.
    3. Sign up for automatic payments and have the flexibility to change your due date if needed.
    4. Always know how much you’ll pay. Easy equal installments. No surprises.
    1. U.S. residents over the age of 18 (or over 19 for Alabama or Nebraska residents) are eligible, provided your identity can be verified.

    2. Checking your rate does not affect your credit score as only a soft pull is completed to check your eligibility. If you choose to finance your purchase with Bread after your pre-approval, we will not perform a hard inquiry with any of the three major credit reporting agencies. Once you have taken out a loan, Bread may report repayment information about your account to the consumer reporting agencies, which may impact your credit score. We may also obtain your credit profile from smaller credit reporting agencies.

    3. You will not be able to adjust your loan terms after you have checked out.

    4. You can apply via the website of any participating online store. When you’re ready to buy, click on Bread’s® financing button to get your rate in seconds. If you pre-qualify, you will be presented with the financing terms offered and sample payment amounts. Add the item to the retailer’s shopping cart and choose Bread® or “Pay Over Time” as your preferred method of payment when you check out.

    Got Questions? 

    Call American Hard Bag and we can help to see if Snap or Bread Finance is right for you!
    1(888) 311-0016