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GeckoFlex 8921DAC 4-Channel Digital Audio to Analog Audio Converter w/Delay Tracking

The 8921DAC provides conversion of two digital audio streams, either balanced or unbalanced, to four analog audio outputs. In addition to digital to analog conversion, it offers per-channel independent delay with up to 5 seconds per channel. Its various modes enable modification of the outgoing analog signal, such as channel gain, swapping, channel summing, phase inversion, and more. Many adjustments to this board can be performed directly on the board’s card-edge controls while a few of the more complex adjustments require the web-based interface or the Newton control panel.

  • Two 32-96 kHz AES/EBU digital audio inputs, either balanced or unbalanced
  • 24-bit D-to-A conversion
  • Four balanced analog audio outputs
  • 0 dBFS supports up to +24 dBu
  • Four buffered digital balanced outputs
  • Independent control of each audio:
    • Channel including
    • Channel pairing
    • Level adjustments
    • Phase inversion
    • Delay of up to 5 seconds
    • Tone generation
  • Card-edge control and status indicators
Supported Chassis Types
GeckoFlex with 8900A-R GeckoFlex Audio rear board, Gecko audio chassis: 8900TX-A, 8900TF-A, 8900TFN-A

Power Rating
8 Watts – single slot

Digital Input
Digital audio input signal:
  • Balanced: AES-3id-1992
  • Unbalanced: AES-3id-1995
Number of inputs: Two balanced or unbalanced
Connector type:
  • Balanced: mini-screw terminal block
  • Unbalanced: BNC
Common mode range:
  • Balanced: 20 Vp-p DC – 20 kHz
  • Unbalanced: N/A
Sampling rate: Input sampling rate 32 to 96 kHz and output sampling rate 48 kHz
Input return loss: >25 dB (100 kHz to 10 MHz)
Input impedance:
  • Balanced: 110Ω
  • Unbalanced: 75Ω

Analog Output
Number of outputs: Four channels, single output each channel
Output impedance: 5Ω single-ended and 10Ω differential
Connector type: Mini-screw terminal block

Signal/noise ratio: >104 dB unweighted 22 kHz filter, >107 dB "A" weighted
THD + noise swept, 20 Hz to 20 kHz: >0.01% 22 kHz filter, +24 dBu (≥–80 dB)
Interchannel crosstalk: <–100 dB 20 Hz to 20 kHz
Frequency response: ±0.1 dB 20 Hz to 20 kHz wrt 1 kHz @ 48 kHz

Operating temperature range: 0° to 45°C
Non-operating temperature range: –10° to +70°C
Humidity: 10% to 90% non-condensing
November 25, 2013
Hillsboro, Ore., November 25, 2013 — Brazil's Canção Nova, a non-profit Catholic Community located in Cachoeira Paulista in the state of São Paulo, is upgrading its broadcast infrastructure with a range of Grass Valley® solutions including five Maestro™ branding and master control systems, five Concerto™ 64x64 routing switchers, five GeckoFlex™ signal processing systems, and six K2 Summit® servers for optimized live event workflows. The system will be live in November and span five locations.
November 12, 2013
Hillsboro, Ore., November 12, 2013 — Bank TV, a satellite broadcaster in the Ukraine, has launched a complete, end-to-end high definition (HD) news production solution from Grass Valley® to facilitate the smooth delivery of its 24/7programming. At the core of the broadcaster's new structure is GV STRATUS® nonlinear media production tools for enhanced production and a streamlined workflow. GV STRATUS is being used in tandem with EDIUS® multiformat nonlinear editing software and GV Edge™ Integrated Playout System with K2 Edge™ playout nodes for 24/7 playout. This deal with Bank TV builds upon the recent momentum generated by Grass Valley in the Ukrainian broadcast market as well as traction gained by GV STRATUS in the EMEA region.
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