SX20 and SX10 best practices for small conference rooms using built in Display Speakers

Hi,
Im planning to deploy some small meeting rooms using SX10 and SX20 codecs, I was wondering if someone could give me some key points to consider:
1. Display recommendation, nice built in speakers, low delay (goog performance with codec echo canceller) I wish to use a 60 - 70 inch Led TV (not yet defined which brand and model) I would like to receive some feedback about nice performance displays with nice audio and echo cancellation performance based on your experience.
2. What would be the drawbacks of using SX10 and SX20 in larger meeting rooms maybe 10 or 12 people?
3. When to use external microphone? or when is recommended to use only internal microphone?
Thanks in advance for your help.
Best Regards, have a nice day!

Pretty well any modern display should work well - different people are going to have different ideas about whether the speakers are any good or not, so you'll have to listen to a few yourself and make up your mid what you think is "better". The echo cancellation can be tweaked manually on the codec to suit the display if required (rather than leaving it on the "auto" setting which, in our installations, has caused more troubles than it's worth).
The main drawback of using the SX10, or the cheaper of the range of the SX20s, is the camera and the amount of zoom. In a larger room, you're not going to get a good close up view with a 2.5x camera. I'd suggest for a bigger room, you look at the 12x cameras.
As a general rule - use additional microphone(s) when you can't get someone within a 3m radius one of the other microphones. So in a larger room, you may need many.
Wayne
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