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No, I'm saying that there is a circuit: https://wiki.analog.com/resources/tools-software/sigmastudio/toolbox/adialgorithms/aec it's in every audio device that has both input and output.
When you entirely rely on the mic and speakers in a laptop, this circuit is in use.
It connects the input and output in such a way that echoes are cancelled. It's an analog thing.
But... to get this, the only rule is that you must have both signals as analog in the same place.
The back of the Wave 3 has a headphone jack... to take advantage of the AEC circuit, you need to use the headphone jack.
Meaning... headphones or external speakers connected to the mic and both signals are analog within that.
The Jabra would win here, not because it does a better job of isolating your voice (it does not, it picks up the whole room), but because it's all integrated and so the AEC circuitry is used.
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Velocio
I'm currently using the USB connection, into my TS3 dock. Sound is monitor speakers on my Samsung 43M70A which is DP to HDMI from the same TS3.
Are you saying that I'll get better / actual echo cancellation if I swap the USB C connection of the Elgato to the headphone jack and plug that into the jack on my TS3?