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Knowledge Base > Accessories > I/O Expansion Cards > 4 Channel AEC Input Card
Where can I find a conferencing application paper on the advantages of SymNet v. Biamp?
Is the SymNet AEC card compatible with the Radius 12x8?
No, only a DSP with a card slot will support the 4 Channel AEC Card, such as Edge and Radius AEC.
Will phantom power damage my non-condenser microphones?
Generally no, some older ribbon microphones are somewhat susceptible, but it’s always a safe bet to disable phantom power when not needed.
Tips and Tricks for Successful AEC
Where can I find AutoCAD files for EDGE and the Symetrix audio I/O cards?
If an AEC source is routed through the SymNet 4 Channel AEC Card module’s Aux In, can the analog input still be used?
Yes, the AEC source will come out of the AEC# output on the AEC Ins module minus any echo. The analog input will come out of the Direct# output of the AEC Ins module.
Does the SymNet 4 Channel AEC Card contain a processor?
Yes, there is a 400Mhz SHARC processor on the AEC card itself. This means there are no DSP resources used in Composer when utilizing AEC.
What if I order an Edge or Radius AEC Frame but do not fill up the card slots?
Filler panels will reside in the empty slots.
What is Phantom Power?
Phantom power derives its name from its invisibility to audio signals, even though the microphone cable carries both phantom power (as direct current) and audio signals (as alternating current). Specifically, the term phantom power means a positive DC voltage sent to the microphone on both audio leads, through current-limiting resistors which also serve to isolate the audio leads from one another. The front panel phantom power button applies phantom power via pins 2 and 3 of the mic input XLR connectors.