The ideal solution is to use identical models throughout the system – so we’d highly recommend using all 6040Rs. But failing that we’d recommend complementing your stereo 6040Rs with centre and surround models of a similar size and comparable playback characteristics, such as the G Four or 8340 models. As part of the Smart Active Monitoring range, the 8340 has the advantage of close integration with GLM calibration software, like the 6040R.