The LAMBDA™ Digital Audio and Metadata Monitor displays and monitors both audio and metadata.  Up to 16 channels of baseband PCM audio can be fed and monitored via eight BNC inputs, or extracted from applied HD/SD-SDI signals.  The decoded and de-embedded audio channels are available on AES outputs. A full-time 2-channel LtRt or LoRo downmix is also provided and available on AES and balanced analog audio outputs.

ITU-R BS.1770 loudness measurements are available on LAMBDA's front panel display via meters and numeric values for accurate visual monitoring of eight audio channels and metadata information.  Audio can be monitored through the premium tuned speaker system with digital crossovers and bi-amplification or through the powerful front panel headphone output.


  • HD/SD-SDI and AES inputs

  • Available Dolby Digital (AC-3), Dolby Digital Plus (E-AC-E) and Dolby E decoding

  • Displays and reproduces up to 16 audio channels as well as metadata via serial input or VANC

  • Loudness metering per ITU-R BS.1770 standard

  • Audio levels displayed via front panel and monitored through internal speakers, headphone output, AES digital output, or balanced analog output


LAMBDA II is the ultimate digital TV broadcast audio monitor, offering AES and embedded HD/SD-SDI inputs for up to 16 audio channels. Optionally, it can also decode Dolby Digital (AC-3), Dolby Digital Plus (E-AC-3), and Dolby E signals.  

Loudness measurements in accordance with the ITU-R BS.1770 standard are clearly displayed on the long-life vacuum fluorescent display along with metadata information including acmod and dialnorm. Audio levels for all applied channels are visible and can also be audibly monitored per-pair or as a downmix. 

Outputs include HD/SD-SDI, individual AES pairs, a full-time Lt/Rt or Lo/Ro downmix, and balanced analog stereo outputs plus a front panel headphone output. 

A low-distortion, high-efficiency class-D power amplifier drives a pair of high-excursion full-range drivers and metal dome HF drivers in an acoustically-tuned enclosure, offering exceptional audio quality and loudness. 


Input Channels

  • Eight AES inputs via BNC connectors (SMPTE 276/AES-3ID-2001)

  • HD/SD-SDI (SMPTE 292M/259M) input (all 16 channels)


Dolby Digital (AC-3) and Dolby E decoding
(Available Option)

  • Decodes AC-3 and Dolby E signals, displays meters for all encoded channels, any pair of channels or downmix outputs for monitoring


Digital Audio Inputs and Outputs

  • 1/2, 3/4, 5/6, 7/8, 9/10, 11/12, 13/14, 15/16 AES inputs, with active loop- through or AES output of de-embedded channels or optionally decoded audio; AES Downmix Monitor output. All digital I/O via unbalanced female BNC connectors per SMPTE 276/AES-3ID-2001


Audio Sample Rate

  • 48kHz



  • 5msec (LoRo), 11msec (LtRt), adjustable in 1msec steps to 100msec


Frequency Response (Electrical Outputs)

  • 20Hz – 20 kHz +/- 0.25 dB


Speaker Outputs

  • 98 dB SPL @ 1 meter, 160Hz - 20 kHz, 85 dB SPL @ 120 Hz


Headphone and Monitor Outputs

  • Headphone via 6.3mm front panel connector, +12 dBu max into 600-Ohms, mutes speakers upon insertion; Analogue Monitor out via electronically balanced 3-pin male XLR, output impedance 25-Ohms, 24- bit DAC, +4dBu @ -20dBFS



  • PCM Audio: <1 msec; Dolby Digital (AC-3): 32 msec; Dolby E (NTSC): 33 msec; Dolby E (PAL): 40 msec


Metadata Input

  • 9-pin female D connector, 115 kbps, pinout per SMPTE 207M (RS-485); Designed to directly interface with Dolby Metadata; alternately metadata can be extracted from VANC space of applied HD-SDI signals



  • 10/100-BASE-T


Front Panel Controls and Indicators

  • Long-life, durable, reconfigurable vacuum fluorescent display provides visual indication of audio levels, metadata, and setup parameters. Independent navigation clusters with rotary encoder and switches for intuitive control of menus, monitor modes, volume, and mute


Power Requirements

  • High-reliability medical grade power supply rated at 100-264 VAC, auto-sensing, 45 W maximum; optional second supply for redundancy


Dimensions and Weight

  • 3.50”H (2RU) x 19”W x 15”D; (89 x 483 x 381 mm)

  • Net weight 13.4 lbs (6.1 kg), approximate



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



  • Click here to view the current regulatory compliance



  • Standard Telos Alliance 2-Year Warranty