The center surround shares the same delay setting as the surrounds, but there is a separate channel calibration adjustment for it. The two speakers will be calibrated together as a single entity since they are sharing the same amp channel. If you haven't do so already, run back through the channel output level adjustment (described on page 24 of the 1050's manual ) while in 6.1 Surround mode to get the center surround channel adjusted properly. There are also some instructions on wiring two speakers to the same output on page 23 of the manual, which can help make sure you've got the wiring correct.