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Diamond-Arc Speaker Amplifier Combo 65SG-Moto720


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Ready for a compact and powerful system for your 1998+ Harley bagger? We’ve got you covered with our new Diamond-Arc Audio Combo. Our new combo offers simple installation, and no need to mount external tweeters. You'll enjoy a fuller-sounding bottom and much better sound quality than all other horn-type speakers.

  • Better sounding than any other pro audio setup
  • Rainproof
  • Drop-in fit, easy installation
  • Crazy loud

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

Diamond Audio 6.5" Speaker Kit

We have been working closely with Diamond Audio for some time now on pro audio speakers specifically for Harley applications. This kit is the result of all that hard work. The kit is a direct bolt-in that does not require any modification to the bike to install. Contains one set of MSPRO65 High Output Pro Speakers, one pair of M075T Extreme Output Tweeter-Short Horns, and matching grills


  • Keep all of your gauges

  • No need to cut up your fairing

  • Much higher volume levels

  • Much better sounding than any other pro audio setup

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 Street, Electra or Ultra Glide!


  • 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 Rating: 200 W RMS/ 400 MAX

  • Sensitivity: 97dB 1W/1M

  • Frequency Response: 110Hz-10k Hz+/-3dB

  • Nominal Impedance: 4 ohm

  • Mounting Depth: 2.375"

  • Cut-out Diameter: 5.625"

  • Over-all Diameter: 6.5"

  • Over-all Height: 2.5625"

Specifications: Tweeters

  • Diameter - 2.28"

  • Overall depth - 2.0"

  • Mounting Depth - 1.12"

  • Sensitivity - 106 dB 1W/1M

  • Frequency - 2k - 20k

  • Impedence - 4 Ohm

  • Power Hnadling - 50W RMS / 100W Max

  • Included Crossover - 12db

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)


  • 2014+ Street Glide, Electra Glide, Ultra Glide

Installation notes: When retaining factory radio, a radio flash and or a DSP is highly recommended. 

What's in the Box?:

  • (1) Pair Diamond Audio MSPRO65 High Output Pro Speakers

  • (1) Pair Diamond Audio M075T Extreme Output Tweeter-Short Horns

  • (1) Pair Fairing Speaker Grills

  • 8 gauge OFC amplifier power and mounting kit

  • (1) Arc Audio Moto720 Amplifier

  • All Applicable Manuals and hardware


  • Diamond 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.

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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.

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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.



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  • 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

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