I thinking of building a shadow box for my speakers in my ht similar to the one done by BritinVA. Is it ok if my center channel is set back a few inches into the box? The shadow box will only be 2x2 or 2x3 covered with gom. If I move the center channel close to the material it will be closer to the seating area then the left and right speakers. Hopefully I am being clear. Thank you in advance for any help.