There is quite a bit of information to discuss here, personally I would recommend getting a book about acoustical treatment. For some simple treatment, using some full frequency absorbtion will help you. You may also want to consider some diffusers to break up the standing waves that can then be absorbed more easily by the absorbtion materials you choose. Auralex makes all of these materials, wish i knew about some good tips on making them yourself, any tips there? diffusers can be just about anything.. just to break up the shape of the room so it is not so squared.
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