I have the Dolby pro logic I in my current volvo c70. I can confirm that this is one of the best sounding systems I have experienced (yes better than the levinson one in lexus imo). They actually have three modes normal, center channel (ie. three channel up front) and prologic (uses all 7 speakers in my convertible ;-)). In this scenario even the rear gets to feel like you sitting at the ideal lisening positiion.