ST400 Cruiser Motorcycle Speaker System


Speaker Option



Loud pipes? No problem! We've got you covered!  Designed to take your music to the next level with 400 watts of loud and clear highway sound featuring Kenwood® amplification and 4" Kicker® speakers!  Easily mounts to the handlebars or highway bars of your Harley-Davidson®, Honda, Yamaha, Victory and more.  Connect using the built-in Bluetooth® or directly with your aux-in headphone jack.

  • 400 watts of power for loud & clear sound at highway speeds & beyond
  • Illuminated handlebar mounted controller for play/pause, source, volume & tracks
  • Connect to any Bluetooth® enabled device for a wireless audio connection
  • Also connects to any standard headphone jack or RCA connection for dual-source options
  • Keep your audio device charged with the built in USB charger connection
  • Choose from an available 2-speaker or 4-speaker option
  • Mount to handlebars or highway bars with the included hardware
  • All-Weather certified for even the harshest weather conditions
  • Industry leading 5-year warranty on all parts and components
  • Made with steel enclosures in a high quality show chrome or satin black finish
  • Designed and built in the USA with only the highest quality components
Steel Horse Audio ST400 Cruiser Edition Motorcycle Speaker System Now Available At Amazon



  • Channels: 2 or 4
  • Max Power (Watts): 400W
  • 4ohm RMS Output:  50W x 4 Channels
  • Classification:  Full Range Class D
  • Signal-to-Noise Ratio:  90dB
  • Frequency Response: 20Hz-20kHz (+0dB, -1dB)
  • Amplifier Size: '5-11/16 X '1-3/4 X '3-7/8 inch

    View instruction manual



  • Kenwood® 400W weatherproof amplifier with Bluetooth®
  • Illuminated, weatherproof handlebar controller
  • Strap mount add-on for controller, to fit any size bar
  • CS Series 4-inch (4") Kicker® speakers in waterproof housings
  • 3.5mm to RCA cable for optional connection to any standard headphone jack
  • Mounting hardware for 1" & 1-1/4" bars included (Other sizes available upon request)
  • Instruction manual with black zip ties

This is for a complete Steel Horse Audio Bluetooth 4" Motorcycle Speaker System kit.  All you need to provide is your mobile audio device.

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Product Q & A


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  • What are the dimensions of the speaker enclosures?

    The speaker enclosures / housings measure 4.75" diameter by 3" depth.

  • Will this fit easily on my 2016 Fatboy handlebars with a detachable batwing fairing?

    Yes, these will fit great with a windshield or batwing fairing.  They can be mounted flush with the bars.

  • Where does the amp get mounted?

    The amplifier measures '5-11/16 X '1-3/4 X '3-7/8 inches and is typically mounted in a saddlebag, fork bag, windshield bag, swing arm bag, front down tube bag or side tool compartment.

  • Is 10 amp draw constant? Is there a USB input? Can switched power source be a toggle switch? What is the measurement of handlebar clamp? Will I-pod touch work with system?

    10 Amps is the peak draw.  There is a USB port for charging only, but RCA inputs for a wired connection and Bluetooth for wireless connection.  Switched power can be a toggle switch or connected to something that comes on and off with the bike (headlight, taillight, etc).  The clamps will mount to a 1" or 1-1/4" bar diameter (other sizes also available).  An iPod touch or any other audio device with a headphone jack or Bluetooth will work great.

  • Any way to attach the 2nd set of speakers to the rear of the bike? like on the sissy bar for the passenger?

    Yes, the 2nd set can be mounted just about anywhere, from highway bars and luggage racks to sissy bar/backrest or even in place of the rear foot pegs.  They are universal and allow for a lot of different mounting options.

  • Is it possible to add on 2 more speakers to this amp? I will mount the initial set-up on my handlebars and if I want to add 2 extra speakers later, is that possible?

    Yes, this is the same amp that is included with the 4-speaker system for easy upgrading to 4-speakers at any time.

  • What are the speaker specs?

    • 400W Peak Wattage • 200W RMS Wattage • 4ohm Resistance • 2-Way Speaker Design • 4" Woofer • 1/2" Tweeter • 88dB sensitivity • 60-20k frequency range

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