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MAAT DROffline MkII Analyzer Batch Loudness Measurement Software

DROffline MkII File Analyzer

MAAT’s DROffline MkII is the batch measurement companion application to our official DRMeter MkII real time DR + R128 measurement plug-in.


  • Official DRi, R128, PSR, RMS
  • Channel–specific measurements
  • Full file metadata


  • LPCM, ALAC (macOS–only), FLAC file formats
  • Sample rates from 44.1 to 384 kHz
  • Word lengths from 16 - 24 bit fixed
    + 32 bit floating point




  • macOS 10.9 and newer, Universal Binary 2, 64 bit only
  • Windows 7 and newer, 32 & 64 bit

Measure R128 Loudness, DRi & More

MAAT’s DROffline MkII batch measurement app is the only software that automatically measures all mandated R 128 parameters, along with official DRi and a host of key metrics that your DAW may not display. All this in the background and out of your way. Offering essential options for musically justified, file–based metering, DROffline MkII offers 24 different measurements, including integrated DRi Dynamic Range and PSR, the emerging Sample Peak–to–Short Term Loudness Ratio. One file can be evaluated, or an entire directory can be measured in batch mode, all in the background while you continue to work.

DROffline MkII generates both plain text and tab–delimited text logs, with optional engineer and studio metadata, so you can hand your clients good looking reports that they can use for replication, distribution and as documentation for post, provenance, or chain of evidence.

Attention Pro Tool & Logic users! DROffline MkII offers easy access to all audio statistics and metadata, with an instant drag & drop interface. Speaking of drag & drop, DRO2 works in conjunction with DRMeter MkII to run measurements when you drop an audio file onto a DRM2 instance in your DAW.

Divide & Conquer

Bringing forward the legacy of the PMF’s legendary TT Dynamic Range metering system, DROffline MkII works with all current international Loudness metrics plus emerging measurement techniques that provide more meaningful numbers than R128 methods alone. Granted, R128 or A/85 is essential for all modern pro workflows, but other Loudness meters only provide half the story.
The companion DRMeter MkII is a plug-in that manually generates DRi values when applied to the loudest passages in a track, and is the perfect real time complement to DROffline MkII for quickly estimating both Loudness and subjective loudness. 

Learn More

This quick video shows you how DROffline MkII works in conjunction with DRMeter MkII for instant measurements and metadata…

Watch it directly on YouTube

Download — DROffline MkII User Manual

The user manual PDF includes lots of production tips and useful info on Loudness

Product Features

DRO2 measures DR, R128 and A/85. Plus, it has HRA (high resolution audio) support and a whole lot more! Did we mention it’ll romp though your directory far faster and more securely than cloud–based utilities?

Loudness Measurements

Mandated R128 & A/85
  • Maximum True Peak (joint measurement as per ITU)
  • Maximum Momentary (joint measurement as per ITU)
  • Maximum Short–Term (joint measurement as per ITU)
  • Integrated Loudness (joint measurement as per ITU)
  • Loudness Range (joint measurement as per ITU)

File Metadata

Additional Informative Metrics
  • File Name
  • Absolute Path
  • File Format
  • Sample Rate
  • Word Length
  • Bits Used (filled)

Loudness Measurements

  • DRi (joint measurement as per PMF)
  • DRi LEFT
  • Maximum True Peak LEFT
  • Maximum True Peak RIGHT
  • Maximum Momentary LEFT
  • Maximum Momentary RIGHT
  • Maximum Short–Term LEFT
  • Maximum Short–Term RIGHT
  • Maximum Sample Peak (SPPM) LEFT
  • Maximum Sample Peak (SPPM) RIGHT
  • Maximum Sample Peak (SPPM joint measurement)
  • Minimum PSR (Sample Peak–to–Short–Term Loudness
    joint measurement as per AES)


Comprehensive, Modern & Fast
  • Cross–platform
  • Fast local background processing
  • More accurate than many other “measurement” products
  • More secure than cloud services
  • 44.1 to 384kHz sample rate
  • Lossless — FLAC, ALAC (macOS–only)

Customer Reviews

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