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Lectrosonics ASPEN SPN Trio Audio Processor

Apr 14, 2011 3:53 PM, by John McJunkin

A heavy-duty, three-in-one mixing, processing, and telepresence solution.

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The Trio ships with a Windows application called ASPEN Control Panel, which facilitates control over every parameter in the system. The application’s graphical user interface offers tabs across the top of the display that show what aspect of operation is being monitored and controlled. In particular, the first tab, Activity, is an overview of overall operation, including input and output channel levels, conferencing input and output levels, and acoustic echo cancellation activity. Other tabs focus in more detail on inputs, outputs, signal processing, matrix operation, events, and so forth. The interface provides rich detail, a great example of which is the filter display, which graphically represents the spectral curve of the applied filter, along with the filter’s effect on phase.

The Lectrosonics ASPEN SPN Trio is a very powerful conferencing and telepresence solution that offers sophisticated matrix mixing, auto-mixing, signal processing, and acoustic echo cancellation, along with POTS bridging and a power amplifier to supply speakers in the conference space. The construction of the unit feels bulletproof and its operation is surprisingly simple, considering the levels of sophistication of which it’s capable. The audio quality is excellent, and it facilitates extensive sculpting of the signal ultimately heard by the users. The auto-mixing sounds very good, largely due to the transparency yielded by its proportional gain algorithms as opposed to the gate-oriented mechanisms of other auto-mixers. In consideration of the tremendous power of this device, the sticker price is well justified, and it is worthy of a look for any contractor who needs a sophisticated system for conferencing and telepresence.

John McJunkin is the principal of Avalon Podcasting in Chandler, Arizona. He has consulted in the development of studios and installations and provides high quality podcast production services.

Product Summary:

  • Company:Lectrosonics, Inc.
  • Pros: Reliable, sophisticated auto-mixing and processing.
  • Cons: Software is Windows-only.
  • Applications: Conferencing, Telepresence, Signal auto-mixing, and distribution.
  • Price: $5,125
  • Matrix: 48 mix buses with full output matrixing
  • ASPEN Port: 1Gbps control and audio data between ASPEN units
  • Inputs: 8 mic/line
  • Gain: 0dB—56dB, programmable in 8dB steps
  • Input Level: 0dBu nominal, max 20dBu
  • Input Impedance: 8kΩ differential mode, 2kΩ common mode
  • Phantom Power: True 48V
  • Dynamic Range: 102dB
  • EIN: -127dBu (20Hz–20kHz, unweighted)
  • THD + Noise : 0.01%
  • Programmable Inputs: 30
  • Programmable Outputs: 16
  • Echo Cancellation: Centralized, bridgeable for Telepresence
  • AEC Tail Time: 128ms
  • Line EC Tail Time: 48ms
  • Outputs: 2 speaker outputs (10W) 1-8 line level (0dBu), 9-12 mic/line level (0, -20, -40dBu)
  • AEC Bandwidth: 10kHz
  • Overall Bandwidth: 21kHz

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