I have two listening positions, one with just the Theatre and the other with all 5 connected speakers. While listening to music I have been switching between the 2 positions. There is a 2 to 3 second gap when selecting the new position, but I prefer the sound with the 18’s acting as front left and right. It “feels” slightly more bassy with just the Theatre. Not a huge difference, but just a subtle difference as it feels more open with the 18’s, which would make sense. Once the music is playing just on the Theatre after a little while I forget which position it is in and does sound very pleasing. I am glad I have the 18’s up front though!