I was just wondering what everyone has done for their door thresholds when they have a double door/double wall? It's a span of around 10" now, so not sure exactly what will work best. Carpet will be on either side and the home theater door has the nice seals and jams from the sound proofing company. The other door will be a normal interior door but might put some cheaper seals on that one in the future. Is an aluminum type threshold recommended, or just a flat piece of solid wood?