First of all, Wayfair were good about the problem as I was searching for a unit that would hold my center speaker which is 30" by 6.8".  In the questions someone asked the size of the top shelf and the answer was 7.5" by 33" well I bought my unit based on that and found out after assembling everything that the actual dimension was under 6" instead of 7.5".  Wayfair did compensate be for their error and I had to modify my box to accommodate my speaker.