• views: 93
• date: 19 August 2026
• posted by: voska89

Software Overview

APU Loudness Contour provides real-time equal-loudness filtering with selectable perceptual contour models and adjustable reference levels. ISO 226 and Fletcher-Munson curves support reference levels from 20 dB SPL to 120 dB SPL, with smooth interpolation between the available phon curves.
The plug-in supports both linear-phase and minimum-phase filtering. Makeup gain compensation is available for each contour and reference level, with calibration based on pink-noise LUFS measurements. Additional output gain can be used for further manual level adjustment.
An integrated real-time spectrum analyzer provides detailed frequency visualization with configurable analysis parameters. Users can select different FFT sizes, window types, bucket widths, and time-averaging settings, while frequency display can be switched between linear, logarithmic, or musical-note scales.

Key Features

• Apply real-time equal-loudness filtering.
  
• Support ISO 226 (2003 & 2023) loudness contours.
  
• Support Fletcher-Munson contours.
  
• Provide K-weighting and A/C-weighting options.
  
• Support ECMA-418 and ITU-R 468 contours.
  
• Normalize contours to 0 dB at 1 kHz.
  
• Adjust contour weight in positive or negative directions.
  
• Use 0% weight for a flat frequency response.
  
• Invert the contour response using negative weighting.
  
• Adjust ISO 226 and Fletcher-Munson reference levels from 20 dB SPL to 120 dB SPL.
  
• Interpolate smoothly between phon curves.
  
• Choose between linear-phase and minimum-phase filters.
  
• Apply contour-specific makeup gain compensation.
  
• Calibrate makeup gain using pink-noise LUFS measurements.
  
• Adjust additional output gain for manual level control.
  
• Analyze audio with the integrated real-time spectrum analyzer.
  
• Configure FFT size, window type, bucket width, and time averaging.
  
• Display frequency information using linear, logarithmic, or musical-note scales.
  
• Use automatic zoom and custom dB range settings for spectrum visualization.
  

Why Choose APU Loudness Contour

APU Loudness Contour is suited to audio engineers, producers, and other users who need to examine or shape frequency response according to established equal-loudness models. Its range of contour standards and adjustable weighting controls provides detailed control over perceptual loudness filtering.
The combination of selectable filter types, reference-level control, calibrated makeup gain, and real-time spectral analysis provides a flexible environment for monitoring and processing frequency-dependent loudness characteristics.

System Requirements

APU Loudness Contour requires a compatible system capable of running the APU Software plug-in. Specific operating system, processor, memory, and hardware requirements were not provided in the source information.

Home Page

https://apu.software/contour/

Product Information

• Software Name: APU Software Loudness Contour
  
• Version: v5.7.1
  
• Languages: English
  
• License type: Full Version
  
• File Size: 57.9 MB
  

   
   
   

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