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ComTech D Series Amplifiers: How to apply Speaker Tunings

Technical Support Guide

Written by Guillermo Gutierrez

Updated at April 21st, 2026

Table of Contents

Brand: Models: Overview: Instructions: Note:

Brand:

  • Crown

Models:

  • CTD-2125
  • CTD-4125
  • CTD-8125

Overview:

This amplifier comes preloaded with speaker tunings for many JBL Control Series models and other 70‑volt speakers right out of the box.  This article explains how to load the tunings.


Instructions:

  1. Open the amplifier’s WebUI, then go to the Configuration tab.

    Accessing the WebUI

 

  1. Under Output Channel 1 Control Panels, you will find the Speaker Tuning section.

 

  1. To apply a tuning, click the “Tunings” button.


 

  1. A pop-up will appear asking you to select the speaker brand, series, model, and application options.

 
 

  1. Press “Apply” to load the tuning onto the output channel.


 

Note:

To remove the tuning, you can revisit the “Tunings” menu or select “Custom” to fully clear all tuning data from the channel.

 

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Table of Contents

Brand: Models: Overview: Instructions: Note:

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