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QC Ultra 6-RM Amp/6 Speaker Kit For Ultra Models

QC Ultra 6-RM Amp/6 Speaker Kit For Ultra Models

  • Complete dual amplfier/6 speaker kit with 525 watts total power
  • Includes QC 475-RM "Quadcast" 300 Watt 4 channel Amplifer 
  • Includes REV 225-RM 225 watt amp
  • Kit fits FLH (Batwing) and FLTR Road Glide model Ultras
  • No radio "re-flash' is required (Road Glide Ultra owners please see Note 2 below)
  • Amplifiers feature R.E.M.I.T. circuitry which gives superb FM reception from a class D amp
  • Supplied "G4" front and rear speakers are direct replacements for stock speakers
  • Lower adaptors are gloss black to match "Limited" models factory inner fairing
  • Unlike car audio based systems, the radios fader control will continue to work
  • Includes metal mesh grills for all 6 speakers
  • Includes 100% plug and play wire harness
  • All required hardware to complete the installation is in the box
  • 3 Year warranty on amplifiers
  • 20 Year warranty on speakers
  • Drag Specialties Part # 4405-0786


Note 1: The amplifiers in this kit are a Class D design. It should be understood that ALL Class D amplifiers, regardless of brand, cause a reduction in FM reception. The amps in this kit feature a proprietary circuit design called R.E.M.I.T. (Reduced Electro Magnetic InterferenceTechnology) that Hogtunes believes gives the BEST FM reception available for any Class D Amplifier designed for a motorcycle.


Hogtunes understands that some riders prefer the cosmetics of in-fairing antennas, however it should be noted that NOTHING works as well as the factory antenna. If FM is an important part of your riding experience, we strongly advise against the use of any in fairing type antenna!


Note 2: From a sonic point of view, Road Glide Ultra has the correct flash,however, the factory flash in Road Glide Ultra makes the radio play considerably QUIETER than it could. Less signal out from the radio means less signal going into the amps. If you install this system without a reflash,it will sound great, but will NOT reach its potential volume. A radio reflash by a Techno Research dealer is required to make this system play to its full volume potential. An OEM Dealer reflash will not “fix” this, as the OEM flash looks at the bikes VIN and will re-install the same “quiet” flash. To find aTechno Research dealer near you, please visit http://technoresearch.com/index.php/tuning-centers or CALL US!





  • Bike Fitment

    • 2014-Current FLHTK Limited Ultra Classic 
    • 2020-Current FLTRK Limited Road Glide Ultra  
    • 2016-Current FLTRU Road Glide Ultra 
    • 2014-Current FLHTCUG Tri Glide Ultra





  • Included In Box

    • 1x QC 475-RM 4 Channel Amplfier
    • 1x REV 225-RM 2 Channel Amplifier
    • 3 Pairs of G4 Speakers (Front/Rear/Lower)
    • 3 Pairs of Replacement Metal Mesh Grills
    • Speaker Adaptors For Liquid Cooled Models
    • All Required Mounting Plates For FLH and FLTR Models 
    • 100% Plug & Play Wire Harnesses 
    • All Required Hardware to Complete the Installation
    • 1 Installation Manual