Hey Matt, would there be a sound difference when mixing original birch and MDF low frequency boxes? I'm really trying to figure our how to fit these Titans as surrounds. I have 3 LCR and would really like all 7 or better yet Atmos to be the same speaker. Not easy to find baltic birch sheets. The original 21" depth will have me down to two chairs instead of 3 for a row. My goal is to run the same speaker at full range for the base layer.