thanks for the answer, we are recording the lectures via philips dvt2010 that we put on the table and it’s word well.
the problem is with the reinforcment of the sound (as you said rightly), the current solution with the dynamic mic works but we try to improve the sound quality as we are able.
so the option for the neck mic is problem because the teacher disagree, the question is if there option that will work better then the dynamic mic.
thanks for the helpful answers!