In your situaution i would

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In your situaution i would placewireless lav mic onthe teacher. If the first option is impossible, my next option would be mic-ing the podium, subject to the teacher staying put, which is unlikely.

Option #3 would be using a mixer output -LINE-MIC signal transformers were available at Radioshack.

Last option would be picking audio off the speaker with the shotgun – not perfect, but working solution.

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