Echo cancellation on Xperia X

Hello,
This is a problem that has been bugging me for years (literally) but I finally got around today to confirming it.
I have an Xperia X with a Love Mei super-rugged case. I find that when the phone is in the case and make calls using the phone’s speaker and mike then callers hear their own voice echoed back to them. If I remove the phone from the case (even during a call) the problem disappears. The reason is not hard to guess - the rigid case literally carries the sound from the speaker back to the mike. So I have just learned to live with it by using an external headset whenever possible.
But today while upgrading to Sailfish latest version (4.3.0.12-f5121-0.2.3.8) I first decided to reinstall Android first to see if the problem happened with Android too and found that there was no echo at all. I then went and installed Sailfish (now a virgin installation) and tested again, and yes the problem had come back.
So my question is, can anyone suggest a way of making the echo cancellation work under Sailfish as it does under Android?
Thanks!

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Dear Avidscavenger ,
I wanted to thank you for your evidence. I had the same problem with my Xperia 10 III, but after reading your reflections, I cut the cover very precisely in corripondence with the microphone.
Now everything is working without echo! Thank you for your sharing.

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that thread is very awesome

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