Want to get Polk CSI A6 as a center speaker and would like to put it on the top shelf below the tv but it will only fit on the lower shelf of my current stand. Lower shelf is 3 inches off the floor and the 2nd shelf is 11 inches off the floor. Will the speaker being an extra 8 inches lower and that close to the floor make a significant difference? It will be center speaker for 2 RTIA9s and 2 FXI A6s and an Infiniti sub. Appreciate any comments/suggestions thanks.