LQ-1 combines ITU-R BS.1770 and EBU R128-compliant metering, comprehensive I/O options, an easy to read display, and a host of other features into a single, cost-effective, compact, and rugged 1RU package.

LQ-1 offers HD/SD-SDI, DVB-ASI, AES and analog I/O plus a TOSLINK® optical input, and accepts baseband and encoded signals with standard decoding for Dolby® Digital (AC-3), Dolby Digital Plus, and Dolby E.

Setup is simple: Select the desired input signal and choose to apply Dolby decoding and metadata if needed. Presets store diverse configurations and can be recalled from the front panel or by GPI.

Extensive alarm capabilities can indicate out of tolerance loudness, missing audio channels, corrupt or missing reference or metadata signals, and errors in Dolby-encoded bitstreams can be detected and logged.


  • LKFS metering for 5.1 or 2-channel audio with Dolby Dialogue Intelligence

  • ITU-R BS.1770-3 and EBU R128 compliant

  • HD/SD-SDI, DVS-ASI, AES, analog, and TOSLINK optical inputs

  • HD/SD-SDI (re-clocked), AES, and analog outputs

  • Front panel headphone output

  • Accepts up to 8 channels of baseband or encoded audio, with standard decoding for Dolby Digital (AC-3), Dolby Digital Plus, and Dolby E signals

  • Downmixed AES and analog output

  • LTC and ATC (SDI) timecode inputs for time-stamped logging

  • GPI/O alarms and control

  • Available SNMP via Ethernet for alarms and logging

  • Available redundant external PSU


Dolby Dialog Intelligence

Included Dolby Dialog Intelligence provides the most accurate estimate of loudness possible in an automatic meter. By pausing integration during non-dialog sections and reverting to BS.1770-2 over time, loudness can finally be measured with accuracy independent of program dynamic range.


Comprehensive Metering

Input and output signal levels are displayed alongside ITU-R BS.1770 measured LKFS loudness and dialnorm metadata to give instant verification of loudness compliance.


Flexible I/O and Audio Extraction

Baseband or coded audio can be extracted from any pair of an applied HD/SD-SDI signal, AES, optical or balanced analog inputs and routed to the decoding and metering core. In DVB-ASI mode, audio can also be sourced from a selected PID and then decoded and measured.


Downmix Output

A selectable Lt/Rt or Lo/Ro downmixed output is provided simultaneously via the front panel headphone connector and rear panel AES and stereo +4dBU balanced analog outputs. Functions such as metadata emulation and Associated Dialog (AD or Visual Descriptive) mixing can also be auditioned on the downmixed output.


Metering Standards

  • ITU-R BS.1770-1/2/3 with Dolby Dialog Intelligence and support for EBU R128


Audio Input Decoding

  • Baseband input and Dolby Digital (AC-3), Dolby Digital Plus, and Dolby E decoding standard. DVB-ASI mode to extract and meter audio from selected PID



  • Eight main input channels via four 75-Ohm BNC female connectors, internally terminated; Two-channel downmix AES output; Signal levels per SMPTE 276M/AES-3ID-2001



  • Auto-sensing HD/SD-SDI (SMPTE 292M/259M) inputs, up to 1080i/60/59.94/50Hz, access to all 16 audio channels



  • DVB-ASI (ETSI TR 101 891 v1.1.1) Transport Stream Input (via SDI connector). Audio PID can be selected for decoding and measurement


Analog I/O

  • 10K Ohm balanced XLR female stereo inputs, +4dBu nominal, +24dBu Max.; Balanced XLR male outputs, +4dBu nominal, +24dBu Max into 600 Ohms


Optical Input

  • Female TOSLINK connector for stereo or encoded input


Headphone Output

  • 6.3mm front panel connector, +12 dBu max into 600-Ohms


Sample Rate/Resolution

  • 48kHz, 24-bit


Parallel GPI/O Control Port

  • 9-pin female D connector, 0-5V TTL levels


Serial Metadata Input

  • 9-pin female D connector, 115 kbps per SMPTE 207M (RS-422/485): Directly interfaces with Dolby metadata (SMPTE RDD6)



  • 10/100 BASE-T via RJ45 for available external logging and SNMP reporting


Front Panel Controls and Indicators

  • Rotary navigation cluster plus graphical OLED display


Power Requirements

  • 90-264 VAC, 50/60Hz, auto-sensing, 35W maximum; Backup redundant DC Input 12VDC, 2.5A maximum via 2.5mm sealed, locking connector with protective cover


Dimensions and Weight

  • 1RU - 1.75”H x 19”W x 11.5”D (44 x 483 x 293 mm)

  • Net weight: 6 lbs. (2.72 kg) approximate


Shipping Dimensions and Weight

  • 22”W x 17”D x 7”H (178 x 559 x 432 mm)

  • Net weight: 11 lbs. (5 kg), approximate



  • Convection cooled. Operating: 0 to 50 degrees C, non-operating -20 to 70 degrees C



  • Click here to view the current regulatory compliance



  • Standard Telos Alliance 2-Year Warranty