ST400 Classic Speaker System

Speaker Size
Kenwood Motorcycle Speaker System   Kicker Motorcycle Speakers

Designed to be loud and clear even at highway speeds, the NEW ST400 Classic Edition motorcycle speaker system by Steel Horse Audio features 4" Kicker™ speakers and pushes 400 watts of top power.  Easily mounts to the handlebars or highway bars of your Harley-Davidson (H-D), Indian, Victory, Honda, Kawasaki, Yamaha and more.

  • 400 watts of peak power for loud & clear sound at highway speeds
  • Easy bolt-on installation to the handlebars or highway bars of any Harley, Indian, Honda, Yamaha& More
  • Connects to any audio device using an aux-in standard headphone jack (or use a separate Bluetooth® or FM radio add-on)
  • Pair with Saddlebag Lid Speakers for the ultimate audio experience
  • All-Weather certified for even the harshest weather conditions
  • Acoustic baffles for added bass response and musical clarity
  • Choose from 4" or 5.25" speakers with a 2-speaker or 4-speaker option
  • True spec-tinned Oxygen-free Copper speaker wire for superior sound and corrosion prevention
  • Made with steel enclosures in a high quality show chrome or satin black finish
  • Premium 8 Gauge Amplifier Wiring Kit with 100% Premium OFC Copper
  • Designed and built in the USA with only the highest quality components
  • Industry leading 5-year warranty on all parts and components




      • Channels: 2
      • Max Power (Watts): 400W
      • 4ohm RMS Output:  45W x 2 Channels
      • Built-in Variable Crossover
      • True spec-tinned Oxygen-free Copper wire
      • Amplifier Size: 8-5/8"W x 1-13/16"H x 3-15/16"D
      • Speaker Size:  Diameter 4.75" | Depth 3"

        View instructions manual




          • Kenwood 400W compact motorcycle amplifier with wire harness
          • CS Series 4-inch (4") Kicker® speakers in waterproof housings
          • 3.5mm to RCA cable for connection to any standard headphone jack
          • 100% Copper spec amplifier wiring kit
          • Mounting hardware for 1" & 1-1/4" bars included. (Other sizes available upon request.)
          • Instruction manual with black cable ties

          This is for a complete Steel Horse Audio ST400 Motorcycle Speaker System kit.  All you need to provide is your mobile audio device.


          PRODUCT Q&A


          Ask a Question
          • What system will work on a harley softail..2021

            All of our motorcycle speaker systems are universal and will work on great on your '21 Softail

          • Can I hook up my Bluetooth to this system instead of using phone jack to listen to music?

            The ST400 system is not Bluetooth out of the box.  However, you can add on one of our Bluetooth handlebar controller options and skip using a cord.

          • Is this particular system bluetooth?

            The ST400 motorcycle speaker system is not Bluetooth out of the box.  However, you can add on one of our Bluetooth handlebar controller options and make it Bluetooth capable.

          • I’m curious how the volume is controlled on the ST400? I can stream off my iPhone but can’t pull it out every time I want to change tracks, volume etc. I would really like an honest comparison between st400 and the st600 ???

            The default volume control on the ST400 is to use your audio device directly.  A lot of folks will use a phone handlebar mount to access it easier, however, we recommend one of our Bluetooth controllers.  With either of these, you can control the phone without having to pull it out.  Everything is conveniently controlled on the handlebars with the controller... As far as an ST400 to ST600 comparison, the ST600 is a small jump up from the ST400.  It will give you about 2x the output plus has some added features.

          • Will the ST400 or ST600 models fit a 2005 triumph rocket III?

            The ST400, ST600 or ST900 will fit nicely on the handlebars of your Triumph Rocket III.  We've done a few installs on them and they look and sound great!

          • What speed volume control app do you guys use , I have an I phone

            We recommend the basic and simple iOS app called "Volume by Velocity".


            Yes, that would work just fine for the positive connection (+), as it is still a direct connection to the battery.

          • I have a 2018 Harley Fatboy; is there a way to plug these into a power source other than a direct connection to the battery ? Also will they fit my handle bars ?

            These motorcycle speaker systems are designed to connect directly to battery for the positive connection (12V+).  However, you could tap in to a power line elsewhere on the bike as long as it provides the same amount of power.  The ground can connect directly to the frame and does not need to connect directly to battery.  The systems will include mounting hardware for 1" and 1-1/4" bars.  We have 7/8", 1-1/8" and 1-1/2" available (free upon request).

          • What kind of radio can I use?

            You can use any radio or audio device with a standard headphone jack or Bluetooth.

          • Can I hook this amp to my accessory connector on my '14 Road King?

            Yes, this is a popular option...  The connection plug is under the seat in front of the battery, it's capped. It is only hot when the ignition is on as well as the accessory switch. There is another under there that is always hot but it doesn't have a switch. H-D® can sell you the correct plug end to plug into either of them.

          • Where does the amp mount?

            The amplifier on the ST400 system is small, measuring only 8-5/8"W x 1-13/16"H x 3-15/16"D.  It can typically be installed in a bag or a side tool compartment.  Fork bag, windshield bag, front down tube bag, swing arm bag, etc all work great too