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BT355 HD Radio Line Leveler And Pre-Amp Adapter for 2014 and Up

1.00 LBS


Product Info

New information about flash - call 800-735-2419 for details

Our new BT355 Line Leveler allows you to install an aftermarket amp and speaker system on your 2014 and up HD.

Included in our 2014+ amp packages.


  • Removes bass distortion when connecting an amp to the factory 2014+ radio
  • High quality three stage circuit for optimal sound quality and precise filtering
  • Adjustable level and frequency
  • Adapts high (speaker) level inputs to pre-amp outputs


  • For 2014 and up stock HD radio*

*NOTE - Ultra models do not have a rear speaker connector in the fairing. For plugging in rear speakers, please see the Breakout Connector for Ultras.


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Product Reviews

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Showing reviews 1-4 of 15 | Next

  1. Worth every penny 5 Star Review

    Posted by on 25th Jun 2018

    Totally fixes stock HU eq curve without having to get the bike flashed and makes good clean audio.

  2. Works like a charm 5 Star Review

    Posted by on 7th May 2018

    Installed an amp and it didn’t sound right. Put the Bt355 in and adjusted the amp and now it’s clear and loud. Worth every penny since I put in a common amp. Stage 1 Boom speakers.

  3. Overcoming Harley 5 Star Review

    Posted by on 4th Mar 2018

    I did not want to be stuck with Harley’s stage 2 stuff but was going to. Then I found out Biketronics has developed these line levelers. I installed a different audio system for reasons untold. These units installed as per their instructions results in trouble free audio. I did not have to go to Harley for anything. On a side note. The people & products at Biketronics are extremely awesome. Call them up if you’re looking at upgrading. I promise you they will do their absolute best to fix you up.

  4. Just what the sound doctor needed 5 Star Review

    Posted by on 27th Feb 2018

    Customer service is A1. Product shipped fast and arrived as described with great instructions. Will definitely recommend to anyone wanting great sound with the factory boom audio unit

Showing reviews 1-4 of 15 | Next

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