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Free Download APU Software Loudness Contour v5.6.2 | 58 MB
APU Loudness Contour is a real-time equal-loudness filtering plug-in designed to shape audio according to recognized perceptual loudness standards. It provides precise control over multiple loudness contour models, making it suitable for audio analysis, monitoring, mastering, and production workflows.
The software is intended for mastering engineers, audio professionals, researchers, and content creators who require accurate frequency compensation based on human hearing characteristics. It supports several established equal-loudness standards while allowing users to customize contour strength and reference listening levels.
APU Loudness Contour combines flexible filter processing with built-in spectrum analysis, enabling users to evaluate and adjust frequency response using real-time visual feedback.
Software Overview
APU Loudness Contour provides access to multiple equal-loudness contour standards, including ISO 226 (2003 and 2023), Fletcher-Munson, K-weighting, A/C-weighting, ECMA-418, and ITU-R 468. Each contour is normalized at 1 kHz and includes adjustable weighting controls for modifying or inverting the selected response curve.
The plug-in supports both linear phase and minimum phase filter processing. Built-in makeup gain compensation is calibrated for each contour and reference level, while an integrated real-time spectrum analyzer provides configurable visualization options for monitoring frequency content during processing.
Key Features
- Real-time equal-loudness filtering.
- Support for ISO 226 (2003 & 2023), Fletcher-Munson, K-weighting, A/C-weighting, ECMA-418, and ITU-R 468 standards.
- Adjustable contour weighting with positive and negative scaling.
- Variable reference levels for supported loudness curves.
- Linear phase and minimum phase filter modes.
- Automatic makeup gain compensation based on selected contour.
- Additional output gain adjustment.
- Integrated real-time spectrum analyzer.
- Configurable FFT sizes, window types, bucket widths, and time averaging.
- Frequency visualization with linear, logarithmic, and musical note display modes.
Why Choose APU Loudness Contour
APU Loudness Contour is designed for users who need accurate loudness compensation based on established perceptual hearing models. Its support for multiple standards and configurable filter options makes it suitable for audio evaluation, mastering, monitoring, and research applications.
The integrated analysis tools allow users to observe frequency content while applying equal-loudness processing, helping improve monitoring and decision-making during audio production.
System Requirements
Windows operating system
Frequently Asked Questions
What is APU Loudness Contour used for?
It is used to apply equal-loudness filtering based on recognized perceptual loudness standards for monitoring, mastering, and audio analysis.
Which loudness standards are supported?
The plug-in supports ISO 226 (2003 and 2023), Fletcher-Munson, K-weighting, A/C-weighting, ECMA-418, and ITU-R 468.
Does the software include audio analysis tools?
Yes. It features an integrated real-time spectrum analyzer with configurable visualization and analysis options.
Home Page
https://apu.software/contour/
Product Information
- Software Name: APU Loudness Contour
- Version: 5.6.2
- Languages: English
- License type: Full Version
- File Size: 58 MB
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