Lenrd bass traps from Auralex in the front corners will help tremendously in taming the megaphone effect from those areas of your room and will even out the reponse. Also I use the small 2 inch thick 1 foot sq panels on top of my bookcase where noone can see them and I think they help.
In my recording studio I cover about 30% of the walls with 2 inch thick 2 x 4 foot panels and this quiets the ping effect from drywall to a great degree. I am able to obtain good soundstaging while monitoring and that translates well to other playback systems and formats.
In my recording studio I cover about 30% of the walls with 2 inch thick 2 x 4 foot panels and this quiets the ping effect from drywall to a great degree. I am able to obtain good soundstaging while monitoring and that translates well to other playback systems and formats.