Waves WLM - Loudness Meter Plug-in (Native)

Waves WLM - Loudness Meter Plug-in (Native)

Waves WLM - Loudness Meter Plug-in (Native)

Waves WLM - Loudness Meter Plug-in (Native)

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Product Highlights

  • Multi-Format Loudness Metering Software
  • SoundGrid Compatible
  • ITU, EBU and ATSC Compliant
  • 64-bit Processing
  • Audio Units
  • RTAS/AudioSuite
  • VST
  • Mac OS X
  • Windows 7
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  • 1Description

The WLM Loudness Meter Native from Waves is a plug-in that provides precision loudness measurement and metering for broadcast, movie trailers, games, packaged media and more.

Fully SoundGrid compatible and compliant with all current ITU, EBU and ATSC specifications, the WLM offers comprehensive Momentary, Short Term, Long Term, and True Peak readouts. It also features a unique warning and logging system that keeps track of your levels, and lets you know when you've exceeded them, or fallen short. WLM is an affordable, all-in-one, cross-platform, multi-format loudness metering software solution.

Main Features

ITU, EBU and ATSC compliant
Foreground, dialog, and average loudness measurements
Momentary, Short Term, Long Term, and True Peak readouts
Intelligent dialog sensor detects and measures speech
Mono, stereo, and 5.1 components


  • Short Term: displays (in LUFS) perceived short term loudness
  • Long Term: displays (in LUFS) average perceived program loudness
  • Range: displays (in LU) the overall loudness range across the program signal
  • Momentary: displays (in LUFS) momentary loudness levels, according to the Momentary scale control settings
  • True Peak: displays (in dBTP) inter-sample peaks which do not register in the sample data but may occur during reproduction of the digital signal
  • Unders: displays the number of times the signal goes below the specified Short Term Min value indicated in the settings panel
  • Overs: displays the number of times the signal exceeds the specified Short Term Max value indicated in the settings panel
  • Measurements Play/Pause: determines if program loudness is registered in the WLM memory for averaging long term loudness range
  • Follow Transport: determines if measurement starts and stops according to host application transport controls
  • Timer: indicates the amount of time measurements have been taken and integrated
  • Reset: resets the Long Term, Range, Overs and Unders counters and returns the integration timer to 00:00:00
  • Method: determines the measurement method
  • Weighting: determines the type of weighting filter
  • Channel: determines the channels being measured
  • Short Term Max: determines the maximum short term level
  • Short Term Min: determines the minimum short term level
  • True Peak Max: determines the maximum true peak level
  • Target: sets the target level reference
  • Custom Pre Filtering: provides low pass (LPF) and high pass (HPF) filters that pre-filter the audio prior to loudness measurement
  • Momentary Scale: determines the scale displayed in the momentary bar meter
  • Logging: displays CSV logging file options

Multi-Format Metering

Measurement Methods
  • EBU: uses foreground audio as the loudness anchor
  • LM1: measures and averages loudness across the whole program
  • DIAL: uses dialog as the loudness anchor, measuring and averaging loudness only when dialog is detected
Measurement Standards
  • ITU-R BS.1770-2
  • EBU R-128
  • ATSC A/85
Time Scales
  • Momentary
  • Short Term
  • Long Term
  • True Peak
  • ITU-R B.S.1770 - K-Weighting
  • Leq(a)
  • Leq(b)
  • Leq(c)
  • Leq(m)
Table of Contents
  • 1Description
System Requirements Mac
Core Duo 2.3 GHz
OS X 10.6.8 to 10.7
1024 x 768 minimum display resolution
Host application that supports Audio Units, RTAS, AudioSuite, and VST plug-in formats

Intel Core 2 Duo GHz/AMD Athlon 64 or equivalent
Windows 7
1024 x 768 32-bit minimum display resolution
Host application that supports RTAS, AudioSuite, and VST plug-in formats

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