Velocity RZA1000.4 Harley 4 Channel Amplifier 1,100 Watts SKU: RZA1000.4



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Our Favorite 4 Channel Amplifer

The RZA1000.4 is the very best-sounding amplifier made specifically for Harley use. This amplifier has better speaker cone control at high volumes for better bass, and far better high frequency fidelity than other amplifiers. Natively compatible with factory Harley radios and aftermarket radios alike, the RZA1000.4 has a super wide range input (.41 to 10 volts) that is balanced so that it can accept anything from a standard line level RCA to a high voltage speaker level input directly from a factory radio. And it does this without the need for any noisy line levelers. This amplifier uses a far superior internal power supply to other amplifiers and can sustain extreme performance where other amplifiers just run out of gas and clip or drop in volume. This is a beast of an amplifier in a small footprint. This amplifier features a full chassis heat sink for more performance in a much smaller size package. The full chassis heat sink also allows for the amplifier to be mounted in any position and to keep cool even on the hottest summer days.


  • 1998 - 2013 Road Glide, 2 in the fairing without any modification to the bike. One fits between each fairing glove box and the inner fairing.  
  • 1998 - 2013 Street Glide and Electra Glide, 1 in the fairing without modification to the bike. 
  • 2014 and later Street Glide and Electra Glide, 1 easily fit on top of the radio without any modification to the bike.  
  • 2015 and later Road Glide, One fits under the radio.
  • Additional Amplifiers can be added to the bags with a plug and play harness on all models.


  • 2 Years Limited
  • 3 Years if installed by an authorized Velocity Speaker Design dealer


Extreme Level Performance

Road Glide

Street Glide

  • Full Chassis Heat Sink Design Can Be Mounted in Any Position
  • Compact Design Fits All ‘14 and Later Fairings Without Any Modification
  • Super Wide Range Signal Input Stage Is Compatible With Most Any Type of Analog Signal
  • Made Specifically for Harley Applications
  • Optimized for Velocity Speakers
  • Flexible Design Is Perfect for Every Type of Speaker on a Bike Including Subwoofers, Bag Woofers, Mid Ranges, and Tweeters
  • Onboard Active 12 db crossovers

Free Radio Flash Loaner Tool

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Flash Your Bike Yourself and Be Sure That the Job Is Done Right

Our flash tool rental kit ships with all of the parts required to flash any Harley touring bike radio from 2014 - current year. The kit ships with a return shipping label for your convenience. After you are finished with the tool simply drop it in the mail and receive a full refund for your $200 deposit.

$120.00 Value! 

Read all of the details here


  • 1,350 Watts Peak Power
  • 4 x 275 Watts @ 2 Ohm RMS
  • 4 x 150 Watts @ 4 Ohm RMS
  • 2 x 550 Watts @ 4 Ohm Bridged RMS
  • Crossover High/Low Pass 40hz - 400hz @ 12db
  • Signal Input Range .41V - 10V Balanced High & Low Level
  • RCA Input - Yes
  • Speaker Level Input - Yes (over RCA connection)
  • Efficiency 87% @ Full Power
  • Remote Trigger 12V or Signal Sense
  • Fuse Size 60A
  • Power Cable 8 Gauge


  • 9.1" L x 4.1 W x 1.54 H

What's Included

  • RZA1000.4 Amplifier
  • RCA Input Harness
  • Speaker Output Harness
  • Allen Wrench