Discontinued Products


For decades, we have explored and pioneered the field of digital audio and loudness metering, offering state of the art tools that let you measure, correct and convert audio for any application.

With LM2, you get a full-featured stereo loudness and true-peak meter, as well as a mastering-grade true peak limiter, which is perfect not only for post, film and live production, but also for broadcast ingest, linking and transmission.

When you need to comply with broadcast standards, the numbers are paramount, and on LM2's front panel, you can check the all-important digits instantly. For even more loudness details, simply connect LM2 to a PC or Mac via USB and you get full, realtime Radar screen picture using the included Icon application.

In short, with LM2 we stay true to our pioneering obligations and are proud to present you with next-generation metering!

Precision Normalization and Meta Data

Precision Loudness, True Peak and Logging

Precision Normalization and Meta Data
Global broadcast guidelines now recognize the need for keeping audio transmission easy and predictable; the main facilitators being transparent normalization and fixed metadata. LM2 facilitates precision normalization and optimum use of dialnorm metadata in AC3 transmission in order to avoid level jumps between regular programming and promos or commercials.

Standard Support

LM2 comes pre-loaded with factory presets compliant with new ITU-R BS.1770, ATSC A/85, EBU R128, NABJ, OP-59, BCAP and more guidelines. LM2 is easily field upgradeable* and will keep synchronized with global practices as they refine. Undoubtedly, standards will be updated within LM2's warranty period which is a whopping 5 years.

True-Peak Limiter

LM2 also features a fully fledged true-peak limiter with 5 adaptive and dedicated limiting profiles optimzed for various types of content.


  • True-Peak Limiter Profile 1: Dynamic
    Tailored for 'sensitive' content - such as classical music, jazz and other acoustic genres - that only need gentle dynamic processing.
  • True-Peak Limiter Profile 2: AC3 Codec
    This profile is tuned to avoid overloads when using Dolby's AC3 codec.
  • True-Peak Limiter Profile 3: Universal
    Use this limiter profile for general purposes and for 'unknown content', for example live transmissions.
  • True-Peak Limiter Profile 4: Loud
    In general, we recommend that you don't process your audio too heavily as it is likely to introduce dynamic distortion, but in case you just need to go very loud, this is the limiter profile you should choose.
  • True-Peak Limiter Profile 5: Voice
    As the name implies, this limiter profile is optimized for voice. It could be speakover applications or for talk radio.  


LM2 always offers a wide variety of 24 bit resolution audio inputs and outputs: AES/EBU, TOS, SPDIF / AES3 id, ADAT and Analog. Analog I/Os are scaled in the analog domain for max utilization of converter dynamic range. Analog inputs may be trimmed at 0.01 dB precision. LM2 may connect via USB to a PC or a Mac for access to the Radar display, Logging, Remote control, Preset management etc.

Lm 2_rear

lm2 logging

24/7 Logging

As a standard feature, LM2 comes with hindsight: The radar can show the past 24 hours, but LM2 actually includes so much memory of its own that you can take a detailed look one week back in time, even if it has had no connection to a computer. Dump log files routinely to a PC or to a Mac, import files into graphing templates included, or design your own in Excel, Numbers etc.

Ingest Normalization

The primary application for LM2 is as a loudness meter but it does one more thing very well: Automatic level offset of programs at a no-compromise resolution (48 bit, fixed point). LM2 therefore includes a precison true-peak limiter to avoid output overload when positive gain normalization is required. For fans of speech normalization, allow LM2 to measure some regular dialog and normalize to that. Otherwise, let its relative gate function automatically take care of all sources. Presets are included, the choice is yours.

Loudness Radar Meter Features

Radar View

Short Term Loudness History, 4 min per revolution, 6dB between circles

Loudness Target

True–peak warning

Loudness Unit


Time since Reset

Program Loudness (I)

(entire program)

Loudness Range (LRA)

(entire program)

Loud part

Short Term Loudness (S)

Soft part

Short Term Loudness (S)

Outer Ring

Momentary Loudness (M)

Sound on Sound
by Hugh Robjohns

There's more to loudness than meets the ear - and after years of research, TC know more about that than most. (...) There's no doubt that loudness metering is the way of the future. Film, radio and TV mixers are already using loudness metering, and the music industry, too, is beginning to see the light... slowly. Interestingly, if you reference mixes to a loudness measurement rather than a peak level, hard limiting becomes extremely counter-productive, dynamic variation is welcomed, and all forms of music compete on an even field. Hurrah!

Check out the full review by Sound on Sound (PDF)
Loudness Authority logo 2016

Loudness Website

Keeping track of the multitude of issues around loudness can be a challenge. That's why we've created a one-stop dedicated loudness website where you'll find critical information on the most important issues.

The site is an answer to the highly relevant question:
"What Is Loudness, and Why Is It Important?"

Visit the Loudness Website

LM2n Webstore

LM2n Plug-in Included

The LM2 hardware unit includes an iLok2 license for our LM2n Loudness Radar Meter plug-in that supports all major DAWs (Digital Audio Workstations), including the latest versions of Pro Tools.

Featuring the same core algorithm, the LM2 hardware unit and the LM2n plug-in form a perfectly matched pair, offering the same precise loudness measurements across the worlds of hardware and software.


Learn More About The LM2n Plug-in

Coverflow Banner

In the Press

There's a reason that world-leading broadcast magazine regularly invite us to share our knowledge: we've been pioneers in the digital audio world since 1985.

We've taken part in research studies and the definition of international broadcast standards right from the start, donating technology which has become a crucial part in new, open international standards.


Read The Articles Here


Icon Software controlling 8 LM2's

Broadcast & Production Sales Team

Sales Strip MKII




Find Your Local Sales Representative


Sign Up to Our Broadcast & Production Newsletter

Your details

Select newsletters

  1. By subscribing I agree to receiving commercial electronic messages from TC Electronic, which may include relevant information from its parent company MUSIC Group and its subsidiaries.

Some of Our Broadcast Users Across the Globe

TC Electronic Broadcast Customers