Hertz-Arc Speaker Amplifier Combo SX165-Moto720


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 baggers 1998+. Our new combo offers simple installation and spectacular out-of-the-box sound.

  • Loud as many horn speakers but without a horn
  • Better sounding than bullet style horns but much louder than regular dome tweeters
  • Waterproof
  • Drop in fitment for all 6.5" Harley speaker locations
  • Two extra channels on amplifier allow for adding more speakers

The MOTO 720 from ARC Audio delivers an impressive 720 Watts of power across its four output channels and up to 360 Watts when bridged to a single four-ohm speaker. The amplifier delivers more power and features from the compact Harley motorcycle-specific chassis. The compact 8.125 by 5.5-inch footprint is ideal for many Harley applications. New speaker terminal blocks integrated into the amplifier chassis deliver solid and reliable power delivery in even the harshest of conditions. The signal connectors are plug-and-play to the provided RCA signal input dongle that comes with the amplifier. Input level range switches have been added to the front panel to make it easy to switch between high- and low-level inputs. 

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 SX 165 NEO Coax Speaker Set

This is a truly amazing Harley-specific speaker. Hertz hit it out of the park with this design. The large oversized 1.4-inch tweeter is the loudest non-horn tweeter we have ever tested and it is louder and better sounding than many stand-alone horns. The woofer of this speaker is a pro audio design that has been optimized for use in Harley applications. Designed to perform in the fairing, tour packs, and lower fairings these woofers deliver clarity and loudness for even the largest scale systems.


  • UV Treated
  • Waterproof
  • Dust & Dirt Proof
  • Designed for High Vibration and Extreme Temperatures

Arc Audio Moto720 4-channel Amplifier

How It Works:

The sensitivity and crossover adjustments are made by removing the machined aluminum top panel of the amplifier, so the system is easy to fine-tune once in place in a Harley fairing. This same panel also prevents water from entering the switches on the top of the amplifier, making this amplifier an ideal addition to your 1998-Present Harley bagger!


  • Microprocessor Class-D Design
  • Auto Sense Turn-On Technology
  • Single Side Plug And Play Connection Design
  • Watertight Direct Connect Speaker Terminals
  • Differential Inputs Allow for RCA and Speaker Level Inputs
  • Terminal Blocks Accept 8-AWG Cables for Reliable Performance
  • High Signal To Noise Ratio Without Compromising Power Output
  • Fully Balanced Input Stage Significantly Increases Flexibility
  • Ultra-Low ESR, High Capacity Power Supply Storage capacitors
  • Bridged Mode Auto Detect Turn-On Works With Chip Based OEM Head units
  • Precision Filtering Reduces Interference in Radio 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 - Peak W 200
  • Power Handling - Continuous W 100 Hi-pass filtered @ 150 Hz - 12 dB Oct.
  • Impedance Ω 4
  • Frequency response Hz 100 ÷ 20k
  • Sensitivity dB SPL 96,5
  • Woofer size mm (in.) 165 (6.5)
  • Midwoofer size mm (in.) -
  • Tweeter size mm (in.) 35 (1.4)
  • Super tweeter size mm (in.) -
  • Woofer Voice Coil Ø mm (in.) 38 (1.5)
  • Tweeter voice coil Ø mm (in.) 28 (1.1)
  • Woofer magnet Special Neodymium N38 H
  • Midwoofer magnet -
  • Tweeter magnet Special Neodymium N38 H
  • Woofer cone Water repellent pressed paper
  • Tweeter dome PEI

Specifications: Amplifier

  • Model: MOTO 720
  • 4- Channels @ 4 Ohms: 150 Watts
  • 4-Channels @ 2 Ohms: 180 Watts
  • 2-Channel @ 4 Ohms (Bridged): 360 Watts
  • Frequency Response: 10Hz - 20kHz
  • Crossover Range: 50Hz - 550Hz
  • Input Sensitivity (Low): 200mV - 3.5V
  • Built-in Fan Cooling: Yes
  • Pigtail Harness Included: Yes
  • RCA Harness Included: Yes
  • Dimensions 8.125"(L) x 5.43"(W) x 1.8"(H)


What's in the Box?:

  • (1) Pair Hertz SX 165 NEO High SPL Coax Speakers
  • 8 gauge OFC power kit with amplifier mounting pad
  • (1) Arc Audio Moto 720 Full Range Amp
  • All Applicable Manuals and hardware


  • 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