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Updating Your SeirenHD HDA2B8 Interface Firmware & DSP Software

The SeirenHD HDA2B8 is a 10-channel A2B interface designed for 2023.5+ Harley-Davidson Skyline OS systems. It features:

  • 8 analog DSP-controlled output channels
  • 2 additional A2B digital channels
  • Used for retaining factory rear amplifiers
  • Retaining factory subwoofers
  • Or feeding secondary A2B amplifiers

This guide walks you through:

  • Updating the firmware
  • Selecting the correct pre-tuned configuration
  • Accessing the DSP tuning software
  • Properly connecting to and using the DSP tuning platform

*IMPORTANT BROWSER NOTICE*

At this time, Google Chrome and Microsoft Edge may block USB communication with the SeirenHD DFU and EQ websites because the browser reports the site as “Not Secure.”

This issue has already been reported to both Google and Microsoft and is currently being worked on.

Chrome / Edge Temporary Workaround

If you prefer to use Google Chrome or Microsoft Edge, you can manually add a browser exception to allow communication with the SeirenHD interface until the browser issue is resolved.

Step 1: Enter the following URL into your browser address bar:

chrome://flags/#unsafely-treat-insecure-origin-as-secure

Step 2: Enable the option located at the top of the page.

Step 3: Add the following URLs into the provided text box:

ws://10.10.254.1,http://eq.seirenhd.com,http://dfu.seirenhd.com

Step 4: Click the "Relaunch" button at the bottom of the page to restart the browser and apply the changes.

This browser communication issue has already been reported to both Google Chrome and Microsoft Edge. Until the issue is corrected by the browser developers, this workaround should resolve connection issues when using those browsers.

BEFORE YOU START

You Will Need

  • A Windows laptop or computer
  • Internet connection
  • A USB-C DATA cable connected to the SeirenHD HDA2B8

IMPORTANT USB-C CABLE NOTE

The USB-C cable used for updating MUST be a data-capable USB cable.

Many USB-C cables sold for phones and charging devices are “charge-only” cables and will NOT allow communication between the computer and the SeirenHD HDA2B8.

If the DFU or EQ website does not detect your interface, the most common cause is using a charge-only USB cable.

For best results, use:

  • A known USB data transfer cable
  • A USB cable that has previously been used for:
    • Android Auto
    • Apple CarPlay
    • Data transfer
    • Device programming
    • Computer file transfers

Avoid low-cost charging-only cables whenever possible.

STEP 1 — Connect the Interface

Connect the SeirenHD HDA2B8 to your computer using a USB-C data cable.

The interface will automatically power up from the USB connection.

Open Mozilla Firefox.

Navigate to:

dfu.seirenhd.com

You should now see:

  • Device Name
  • Serial Number
  • Current Firmware Version

Displayed on screen.

USB Connection Note

The HDA2B8 receives power directly from the USB connection during firmware updating and DSP programming. External vehicle power is not required while connected to the computer.

STEP 2 — Select the Correct Firmware

The DFU page contains TWO TYPES of firmware:

Universal Firmware Options

These are designed for custom DSP tuning access.

Full EQ — Version 2.2.2

  • Flat output
  • Full DSP access
  • Recommended for most custom systems

EQ Sub — Version 2.2.1

  • Flat output with subwoofer configuration
  • Full DSP access

These firmware versions allow access to the web-based DSP tuning software.

PRE-TUNED FIRMWARE OPTIONS

The SeirenHD DFU system also includes many pre-configured DSP tunes designed specifically for certain speaker systems.

Examples include:

  • Hertz
  • Cicada
  • Factory Rockford Stage 3
  • With Sub
  • Without Sub
  • Extreme Audio EX
  • Extreme Audio SS
  • Velocity Coax Horn
  • Velocity Overdrive

These tunes are already optimized for those speaker combinations.

VERY IMPORTANT

DO NOT select firmware based ONLY on the version number.

The DFU page may show the “newest” universal firmware at the top, but your correct firmware may be a different version number depending on your speaker package.

Example

A Hertz tune may use a lower firmware number than the universal tune — that is NORMAL.

What matters is selecting the firmware that matches YOUR exact speaker setup.

Selecting the wrong firmware can result in:

  • Incorrect EQ
  • Poor sound quality
  • Improper crossover settings
  • Incorrect DSP configuration

STEP 3 — Install the Firmware

Once you locate the correct firmware:

  • Press the yellow “Update” button
  • Allow the update process to complete
  • DO NOT disconnect the USB cable during the update
  • Wait until the update fully finishes

STEP 4 — FOR CUSTOM DSP USERS ONLY

If you installed either:

  • SeirenHD HDA2B8 Full EQ (2.2.2)
  • SeirenHD HDA2B8 EQ Sub (2.2.1)

Then continue with the steps below.

Reconnect the Interface

After the firmware update:

  • Unplug the USB cable from the interface
  • Wait approximately 60 seconds
  • Plug the interface back into the computer

STEP 5 — Access the DSP Tuning Software

Open Firefox and navigate to:

eq.seirenhd.com

This is the web-based DSP software for the SeirenHD HDA2B8.

From here you can:

  • Adjust crossover settings
  • Tune EQ
  • Set time alignment
  • Configure output levels
  • Save and load tuning files

NOTES ABOUT DSP TUNING

The Full EQ and EQ Sub firmware options provide:

  • Flat signal output
  • Full manual DSP access
  • Custom tuning capability

These are intended for:

  • Advanced users
  • Dealers
  • Professional tuners
  • Custom audio systems

If you simply want a plug-and-play experience, it is recommended to use the pre-tuned firmware that matches your speaker package.

For users wanting advanced tuning control and maximum performance, we highly recommend watching the DSP tuning tutorial video below before making adjustments.

DSP TUNING VIDEO GUIDE

For a full walkthrough on how to use the SeirenHD Pro DSP Tuning Software, watch our step-by-step video guide below:

▶ WATCH THE DSP TUNING VIDEO GUIDE

How to Use Our Pro DSP Tuning Software on the SeirenHD A2B Amp Interface for 2023.5+ Harley-Davidson Models

This video covers:

  • Connecting to the DSP software
  • Understanding channel routing
  • Setting crossovers
  • Adjusting EQ
  • Time alignment
  • Saving and loading tune files
  • Proper DSP tuning practices
  • Tips for getting the best sound quality from your system

This guide is highly recommended for anyone using:

  • Full EQ firmware (2.2.2)
  • EQ Sub firmware (2.2.1)
  • Custom speaker configurations
  • Advanced DSP tuning setups

TROUBLESHOOTING

Device Does Not Connect

Try:

  • Using Firefox instead of Chrome or Edge
  • Reconnecting the USB cable
  • Closing and reopening Firefox
  • Waiting 60 seconds after firmware updates before reconnecting

DFU Page Loads But No Device Appears

  • Verify the USB cable is connected properly
  • Verify you are using a DATA-capable USB-C cable
  • Try a different USB cable
  • Try a different USB port
  • Restart Firefox

DSP Site Will Not Detect Device

  • Ensure you installed:
    • 2.2.2 Full EQ
    • or 2.2.1 EQ Sub
  • Disconnect USB for 60 seconds and reconnect
  • Refresh the EQ page

NEED HELP?

Volunteer Audio offers:

  • Lifetime Tech Support
  • Step-by-step install videos
  • Plug-and-play motorcycle audio systems
  • Professional DSP tuning assistance

Call: 1-844-30-AUDIO
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