I have a 40 in the center, 38's up front, 28's in the rear, and a pair of JBL N24s on the 6th channel. My sitting position is on the back wall. The 28's are positioned 7 ft. high on the side walls firing in towards the listeners. The N24's are on the back wall at ear level on each side of the couch. The room is 20' x 13'.
Is there any value to timbre-matching the speakers on the 6th channel? In other words, would I experience a significant improvement in sound if I changed out the JBL's for Polk Fxi30's? My interest is in movies only, not music (I prefer 2 channels for music).