Impedance matching question

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You were right mneary, the speaker needs enclosure. It's still not perfect though co'z I only use some cardboard. I'll try to find some rubberized foam and see what happens! I'm very happy I finally got it to work! Thanks to you!
 
Have you ever heard a speaker without an enclosure or with a cardboard enclosure? The low frequencies are cancelled.

DTMF doesn't work if the low frequencies are cancelled.

I am glad you fixed it.
 
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