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Helix-Diamond Speaker-Amplifier Combo 2014+ Harley Street Glide C-14SGHXDA-SYS1


Complete Plug-and-Play Extreme-Level Harley Street Glide Stereo System Upgrade

This kit comes loaded with all of the parts you need to upgrade your 2014-and-Up Street Glide. This is top-level gear, and it's all plug-and-play with the factory radio. So there is no need to track down all of the best components, wire harnesses, and installation hardware. It's all included in this kit.

The Best Sound Quality

Step into the top level of pro audio Road Glide speakers. This kit includes everything you will need to add Diamond Audio M075T horns and MSPRO65 mid-woofers to your 2014+ Street Glide. This is a whole new level of loudness that has not been possible until now.

Easy Installation

We include several parts in this kit that make installation a snap. Included are quick disconnect harnesses for each of the horns and crossovers. The included speaker grills bolt into the place of the original factory grills. Each horn comes with a CNC machined HDPE backplate. All fasteners are stainless steel. The woofers are plug-and-play with the factory Harley speaker wiring and many more installation goodies!

IP65 Marine Grade Speakers

These speakers are designed to take all of the weather you can throw at them. They are treated for extreme UV exposure, extreme swings in temperature, high vibration, and water.

Competition Level Parts All-Around

There are no performance bottlenecks in this entire kit. Every part is the latest and greatest. The Helix amplifier has the most advanced DSP on the planet. The speakers come with custom grill-mounted horns. Every component comes with the best possible connection and wire harness solution possible. 

  Included in This Kit:

  • (1) Helix M FOUR DSP 4-Channel Amplifier with Integrated 10-Channel DSP
  • (1) Pair 6.5" Diamond Audio MSPRO65 pro audio woofers
  • (1) Pair Dual-stage Diamond Audio M075T compression horn tweeters 
  • (1) Pair Stamped steel, powder-coated Street Glide speaker grills with horn provisions
  • (1) 8 gauge OFC amplifier power kit for Harley Davidsons
  • (1) Set '14 & up Harley factory radio signal interface harness
  • (1) Set '14 & up Harley factory speaker pod interface connectors with extensions
  • (1) Set Neoprene speaker gasket
  • (1) Set CNC machined HDPE horn mounting rings 
  • (1) Set Pre-wired OFC tweeter extensions with serviceable quick disconnects

The Magic Compression Horns

The Diamond Audio M075T is a dual-stage horn design with a much smoother sound than what is ordinarily possible. The full format diaphragm is large and robust, which allows for extreme level output volumes. The magnet in these horns is actually in front of the diaphragm, and the voice coil is on the front side of the diaphragm, which is genius and allows for a much more compact horn design that easily fits in front of the midrange.

Bold Pro Audio Mid Woofers

The Diamond Audio MSPRO65 6.5" woofers are a significant improvement on all other pro audio type mid-woofers on the market. These woofers have a better bottom-end response. Other popular pro audio woofers sound notoriously thin on the bottom end. Diamond Audio uses a convex cone geometry that increases cone rigidity under load while keeping the moving mass down. This makes the speaker louder and better sounding.

 Note: The improved bottom end response of these woofers is superior to other 6.5 inch woofers on the market but should not be confused with the bass response of larger woofers like subwoofers or 6x9 lid speakers. 

Steel Speaker Grills with Horns Mounted

We stamp and mount the MO75T horns for you. Black coated stainless steel fasteners are used, and a CNC machined HDPE backplate so that the speaker grills match the integrity of the rest of the bike.

12db Crossovers Add a Lot to Performance and Reliability

Most of the horns on the market come with 6db caps for crossovers. Those types of crossovers have a lot of problems, though. The sound of a horn using just a cap changes dramatically with volume, making it impossible to tune your system to sound equally as good at high volume as lower volumes. The crossovers included in this kit are 12db crossovers with a much higher power handling and a much more stable output at all volume levels.

Helix M FOUR DSP 4-Channel Amplifier with Integrated 10-Channel DSP

The Brand New Helix M FOUR DSP is a powerful 4-channel amplifier with a fully integrated digital sound processor manufactured in Germany that brings a continuous output of 135 Watts per channel, both at 4 Ohms and 2 Ohms. This game-changing control center is cool, compact, efficient, and up for any challenge in your Harley system.

Perfect for integration with factory Harley radios, the M Four amplifier/DSP has many features that make it different from anything else ever made.


Fits 2014-Present Street Glides. Will not fit in the fairing of '13 and down Road Glide or Street Glide. Works with all radio flashes, factory (i.e., Ultra, CVO, Standard, etc.), and aftermarket (i.e., Rockford, Kicker, Soundz, etc.).

 Helix M Four DSP Amplifier Harley Radio Connections

Factory Harley Radio Interface for Front Signal Included

There is No need to buy a separate radio connection harness. Plug-and-play connections are included with this amplifier. There is also no need for an external radio load compensation network either. The Helix M Four DSP amplifier has an advanced radio load compensation circuit built-in. Helix amplifiers do not require the complex and bulky signal interfaces that all other amplifiers and DSP units require. This makes connections much simpler and much cleaner. 

Helix M Four DSP Harley Accessory Connection

Factory Harley Accessory Power Interface Included

There is no need to cut into the factory radio harness to get accessory turn-on power. A plug-and-play connection and cable are included.

Premium 8 Gauge Power Harness

The included power harness is 100% OFC (oxygen-free copper). The ANL fuse holder is waterproof and install-friendly. The power cables have been pre-terminated, heat shrunk and loomed for you. Comes with a mounting pad making for a beautiful installation in the fairing every time.

Harley Davidson Fairing Speaker Pod Connectors

Plug and Play Speaker Pod Connectors with Extensions

Don't cut any wires! We include plug and play connectors for the factory speaker pods in the fairing. This makes the installation easy. Plug into the pods and connect the speaker wire extensions into your new amplifier.

Neoprene Speaker Gasket

It wouldn't make any sense to install the best speakers without properly sealing them into the speaker pods. So we include a unique but straightforward gasket that we have manufactured just for speakers in Harley Davidson applications. The adhesive and the neoprene rubber maintain integrity for years in extreme temperatures.

Specifications - Amplifier/DSP:

  • Model: M FOUR DSP
  • Power RMS: @ 4 Ohms: 4 x 135 W; @ 2 Ohms: 4 x 135 W; Bridged @ 4 Ohms: 2 x 270 W
  • Amplifier Technology: Class D
  • Inputs: 6x RCA, 6x High-level speaker, 1x Optical SPDIF, 1x Remote In
  • Input sensitivity: RCA 1-4 V, Highlevel 5-20 V
  • Input impedance RCA: 22 kOhms
  • Input impedance high-level: 9-33 Ohms
  • Outputs: 4x Speaker, 6x RCA, 2x Remote Out
  • Output voltage RCA: 6 Volts RMS
  • Frequency response: 20 Hz-22,000 Hz
  • DSP resolution: 64 Bit
  • DSP power: 295 MHz
  • Sampling rate: 48 kHz
  • DSP Type: Audio signal processor
  • Signal converters: A/D: AKM 32 Bit, D/A: AKM 32 Bit
  • Signal-to-noise ratio digital input: 105/108 dB Speaker / Line Output
  • Signal-to-noise ratio analog input: 102/105 dB Speaker / Line Output
  • Distortion: < 0.03/0.005 % Speaker / Line Output
  • Damping factor: 100
  • Operating voltage: 10.5-16 Volt (max. 5 sec. down to 6 Volts)
  • Idle current: 1500 mA
  • Max. remote output voltage: 500 mA
  • Fuse: 2x 30A LP-Mini-Fuse
  • Additional features: ADEP.3 circuit, Auto Remote switch, 32 Bit CoProcessor, Control Input
  • Dimensions (H x W x D): 2.0” x 9.06” x 6.06”

Specifications - Woofers:

  • Model: MSPRO65
  • 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 - Compression Horn Tweeters:

  • Model: M075T
  • Overall Diameter: 2.28"
  • Cut-Out Diameter: 1.61"
  • Over-All Depth: 2.0"
  • Mounting Depth: 1.12"
  • Sensitivity: 106 dB 1W/1M
  • Frequency Response: 2k - 20k
  • Nominal Impedance: 4 Ohm
  • Power Handling: 50W RMS / 100W Max
  • Included Crossover: 12db


Typically ships in 2 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!


  • Helix Components: 1 Year
  • Diamond 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.

    Finance Up to $3,000 Today and Shop Right Away

    American Hard Bag has teamed up with Snap Financing to offer our customers a 100 day same as cash financing option. We have found this to be a great program. We advise you to pay off your purchase within 100 days to take advantage of $0 in fees. We cover the financing fee for you, as long as you pay your purchase off within the 100 days. After that point fees will apply.  

    No Interest & You Pick Your Payments

    We pay your initial SNAP processing charge for you. There is an initial charge that SNAP has for running the application, but we cover that charge entirely for you when you make your purchase. SNAP gives our customers 100 days to pay and not incur any fees or interest. So your entire purchase is "Same As Cash". No hidden fees.

    No Credit Needed & No Hard Credit Inquiry

    Snap has an 80% approval rate. It's simple. If you have had a job for 90 days or more, have a checking account in good standing, and make more than $1,200 a month you should qualify. You never have to worry about your credit score being affected by applying. So there is nothing to lose except a great opportunity. 

    Up to $3,000


    Apply Now

    Bad Credit, No Credit, OK!

    Snap Finance provides easy financing for people with good or bad credit just the same. Even if you have no credit, Snap is a great way to finance the things you need. It’s not a traditional loan, but a consumer lease that spreads out your purchase over 100 days.

    We don’t pull credit from the main credit bureaus (CRAs)- because that actually can hurt your credit! And our finance experts are here to help. What does that mean to you? Even with a low credit score, you have a great chance of being approved with Snap! Don’t let no or bad credit stand in your way anymore.

    High Credit Limits

    Not only do we offer high approval rates, we offer high approval amounts as well. So if you have a job and good banking history, apply today to see how much you qualify to receive. Once approved we’ll set up easy automatic payments which makes owning the new audio system for your Harley or upgrading your existing system a breeze. Don’t let your credit history stand in the way. 

    All you need to begin a new application is:

    • Be at least 18 years old
    • Have a steady job with reliable income
    • Have an active checking account

    $450 is the minimum amount that can be financed. 


    Apply Now


    Got Questions? 

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