Tech Topics

This page links to some topics of a detailed technical nature. Not all of these topics are specific to MSO, but understanding them can be useful when tracking down and solving problems that are sometimes encountered when using MSO.

• Current Topics

  • Important Considerations For SPL Optimization
    • Important Considerations For SPL Optimization
      • What This Article Covers
      • Standalone SPL Optimization
      • Multi-Stage Optimization Has Less Strict Filter Requirements
      • Setting Sub Gains Before Measuring
    • Distortion Matching For Dissimilar Subs
      • Maximizing SPL Requires Careful Sub Setup
      • SPL Maximization Tries To Acoustically Match Subwoofer Phase Responses
      • SPL Maximization Tries To Keep All DSP Channel Gains Equal
      • Using Distortion Matching To Set Relative Sub Gains
      • Testing the REW Use Harmonic Frequency as Ref Option
      • Summary of Results So Far
      • Recommended Method for Distortion Matching
      • Using Mismatched Amplifier Gains to Achieve Subjective Preferences
  • Creating Specialized Configurations
    • Creating Specialized Configurations
      • Creating Configurations Without the Configuration Wizard
      • When Manual Creation of Configurations is Needed
      • How to Create Specialized Configurations Manually
    • Creating Configurations Manually
      • Manual Creation of Configurations
      • The First Configuration
      • Creating Subsequent Configurations by Cloning
    • Defining Filter Channels
      • The Assumed DSP Channel Structure
      • Adding Filter Channels
    • Adding Filters, Delays and Gains
      • How to Manually Add Filters to Filter Channels
      • Adding Multiple Filters Using Copy and Paste
      • Restrictions on Delays and Gains
    • Associating Measurements With Filter Channels
      • Filter Channel Measurement Associatiions
      • The Example Project Without Measurement Associations
      • Performing the Measurement Associations on the Example Project
    • Making Measurement Groups
      • Creating Measurement Groups Manually
      • Adding Measurement Groups
      • Why "Measurement Groups"?
    • Changing Filter Parameter Values and Constraints
      • Manually Setting Filter Parameter Values and Limits
      • Using the Properties Window
      • Parameter Locking
      • The Different Methods of Specifying Filter Parameter Values and Limits
  • Exporting MSO Configurations for Use with JRiver Media Center
    • Exporting MSO Configurations for Use with JRiver Media Center
      • JRiver Configuration Export
      • Preliminary Considerations: Negative Delays
      • Running the JRiver Export Wizard
  • The miniDSP "Write-Only" Problem
    • The miniDSP "Write-Only" Problem
      • The miniDSP Software Display May Not Accurately Reflect the Device State
      • Only Trivial Information Can Be Read From a miniDSP Device
      • The ezbeq Software Documentation Warns About This
      • If In Doubt, Use the miniDSP Reset Function
      • The miniDSP Software Should be Upgraded to the Newer Device Console
  • The History of Multiple-Subwoofer Optimization
    • The History of Multiple-Subwoofer Optimization
      • Introduction
      • Bruno Korst-Fagundes Masters Thesis
      • JBL BassQ
      • Sound Field Management (SFM) and Other Work by Harman
      • Earl Geddes Approach
      • The Double Bass Array (DBA) and Controlled Acoustic Bass System (CABS)
      • Dirac Live Bass Control (DLBC)
      • Software Differences Between the Plane-Wave Approach and SFM/DLBC/MSO
      • Trinnov Waveforming
  • How Optimization Errors are Calculated: the Details
    • How Optimization Errors are Calculated: the Details
      • Error Calculation Details
      • Background
      • Details Common to All Optimization Modes
      • Details Common to Optimization Modes Supporting a Target Curve
      • Details of As Flat as Possible at All Listening Positions Mode
      • Addressing Seat-to-Seat Variation More Directly
  • Two-Channel Multi-Sub Setups Using MSO and Equalizer APO
    • Two-Channel Multi-Sub Setups Using MSO and Equalizer APO
      • Two-Channel DIY Bass Management for Multiple Subs
      • The Equalizer APO Configuration File
      • Saving Equalizer APO Data For the Entire Configuration
      • Saving Equalizer APO Data For a Single Channel
  • "Optimizing the Splice" of Subs to Multiple Satellites
    • Theory
      • Introduction
      • Hardware and Software Requirements
      • Caveats
      • Background: The Sub Distance Tweak
      • Conditions for Perfect Integration When Using an LR4 Crossover
      • What's Missing In The Sub Distance Tweak?
      • Independent Satellite Phase Adjustment
      • Integration of All Satellites Using Multiple Crossover Frequencies
      • Concern About Adding All-Pass Filters
    • Using MSO to "Optimize the Splice" of Subs and Satellites
      • Procedure for Integrating Multiple Satellites
      • Conventional MSO Use vs. Multi-Satellite Splice Optimization
      • Preparing for Dirac
      • Setting Up The MSO Project
      • Summary of Overall Optimization Procedure

• Obsolete and Unsupported Topics

  • Using MSO to Help Find the Optimum Crossover Frequency
  • The Geddes Approach: No Conventional Crossover