"Partial" Concert hall acoustics

Hi everybody, I would like to know if a partial stage acoustic conditioning would be enought for a concert hall like this: Measurements are 10 meters x 20 meters x 5 meters ceiling height the hall only got mineral fiber ceiling, and walls and floor are concrete made. Is ok only conditioning the stage walls? Do I need hangers like this ?

I think there is no low cost solution, but should it helps anything?

I do not know how answer a question of "is partial treatment enough?" You will still have echos AND reflections off the ceiling. Dispersion may be appropriate also... There is a saying in english: The wrong product at the right price is still the wrong product. Andre

OK, I see. So the question should be: If you were at the stage, and the stage is 3 walls treated, should it sound the drums better than if you listen it in the middle of the hall?