4-Speaker Ultra Boom! Audio Stage I Bagger Kit

Part Number 76000411A




Fill the air with sound from this Boom!™ Audio Boom Bagger Kit. The marine-grade, Class D, amplifier was designed to withstand the harsh on-the-road environment. When installed, the increased power of the amplifier provides the upgraded speakers a clean signal, and a custom equalization to optimize the performance of the 4-Speaker Ultra Boom!™ Audio speaker system.

  • Designed specifically for Harley-Davidson® models equipped with a King Tour-Pak®
  • Features a UV-stabilized, water and dust-resistant injection-molded polypropylene coned woofer built to withstand the elements while delivering rich sound (frequency response 75Hz-20kHz)
  • Highly efficient 2-ohm design (91.5db, 2.83V @ 1m) and plenty of power (75 watts/channel RMS)
  • Plug-n-play connectivity features new harnesses that fasten at all existing connections - speakers and amp fit effortlessly without cutting or splicing wires
  • Ensure maximum output of your audio system with the recommended High Output Charging System P/N 29900028A
  • Kit includes Boom!™ Audio 6.5" fairing speakers, Boom!™ Audio 4-channel fairing-mounted amplifier, amplifier mount and wiring harness
  • Dealer installation is recommended and Dealer Digital Technician software update is required
  • Stop by a participating dealer to interact with a unique audio display that lets you simulate how your bike will sound with Boom!™ Audio upgrades - contact your local dealer for details

Fits '14-later FLHTCU, FLHTCUL, FLHTK, FLHTKL and FLHTCUTG models. Also fits '14-later FLHT and FLHX and '14-'17 FLHXS models equipped with a Boom!™ Box audio system, King Tour-Pak® luggage and rear speaker pods. Dealer Digital Technician software update is required. Dealer installation is recommended. Separate purchase of Power Extension Harness P/N 69200921 is required if installed with Hidden AM/FM/WB Antenna P/N 76000513, Electra Glo™ Headlamp Trim Rings or Fairing Edge Lights.

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  • Model


Use of a Boom!™ Audio Amplifier turns off the radio's internal amplifier. Installation of a third or fourth set of speakers requires the Boom!™ Audio Speaker Expansion Kit

  • Water Resistant

  • Dealer Install Recommended

  • Warranty

    2 year limited warranty – Go to for full details
  • Sold in Unit

  • In The Box

    Boom! Audio 6.5” fairing and rear speakers, Boom! Audio 4-channel fairing-mounted amplifier, amplifier mount, and wiring harness
  • Configuration

    2-way full range
  • Audio Size

    Woofer - 6.5", Tweeter - 1"
  • Impedance

  • Crossover

    2nd Order High-Pass Filter @ 3000Hz
  • Sensitivity

    91.5dB +/- 2dB
  • Class

    Class D
4-Speaker Ultra Boom! Audio Stage I Bagger Kit is rated 4.0 out of 5 by 8.
Rated 2 out of 5 by from Not worth the grand it cost Can not hear after 55 miles an hour speakers can not handle bass had it my bike for 2 years now replacing it so I can listen to music at cruising speed
Date published: 2018-01-09
Rated 5 out of 5 by from Great Upgrade Upgraded from the stock system before delivery of the Tri Glide after hearing the difference on similar cycles. It sounds great going down the road and retains the OE look.
Date published: 2017-07-01
Rated 4 out of 5 by from Great sound however 2 speakers failed Great sound upgrade for being hearing impaired. However 2 speakers have failed to date one front one rear.. both the center speaker just fell out.
Date published: 2017-05-13
Rated 5 out of 5 by from What a difference. Just got my 2014 Ultra Limited out of storage at the dealership and had this upgrade added. Right from the beginning I knew the money I spent was well worth it. Although it is somewhat louder than stock, I can truly say the clarity and punch is a huge upgrade. The bass hits you squarely in the chest with excellent high end sound also. I can take the volume all the way up and the system has no distortion. I had kids in the car next to me playing along with a drum solo that was on the radio and they gave me a thumbs up. I would definitely recommend this product.
Date published: 2016-03-18
  • y_2018, m_2, d_26, h_20
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  • clientName_harleydavidson

What is the difference in part numbers 76000411 and 76000411a?

Asked by: yamadog11

Boom! Audio Stage I Bagger Amp & Speaker Kit - 4-Speaker P/N: 76000411A

Where can the PDF installation instructions for the Boom! Audio Stage I Bagger Amp & Speaker Kit - 4-Speaker P/N: 76000411A be downloaded from. I need them to decide whether I can install this product or not.
Asked by: WLibert

Auto volume control

I have a 2015 tri-Glide and when I purchase the bike I had the BOOM! AUDIO BAGGER AMP & SPEAKER KIT installed before i pick it up from the dealer and now the auto volume control will not work on the bike also when it does come on then I cant change the volume from the handle bars. Is this normal when you have the BOOM! AUDIO BAGGER AMP & SPEAKER KIT added??? If so what can I do to get this to work? $1000.00 is a lot to pay for something that does not work!!
Asked by: rkelly17

Will upgrade play without having the new software flashed

Asked by: Jimmy69
Hello Jimmy69, You do need to have the download installed to activate all of the components. Thank You!
Answered by: JD34
Date published: 2015-04-16

Amp in kit

will this amp in this kit power the front stage II speakers that HD just came out with?
Asked by: oneup
Hi Oneup, Unfortunately, no, the Boom Audio Stage I Amp in this kit will not power the Stage II Speakers. If you were going to install Stage II Fairing Speakers, you would need the Stage II Fairing Amp kit, P/N76000278, Thank you for your question.
Answered by: FXS78
Date published: 2015-03-09
  • y_2018, m_2, d_26, h_20CST
  • bvseo_bulk, prod_bvqa, vn_bulk_2.0.7
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  • clientName_harleydavidson

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    Prices listed are generally the Manufacturer's Suggested Retail Price (MSRP), excluding taxes and shipping. Prices at local dealerships may vary. All online orders will be fulfilled and shipped by
    Harley-Davidson Motor Company as the agent for the Selling Dealer.