A room large enough to equally space the speakers from the listening position requires less, if any, processing to adjust for time/distance variables which can only be a good thing.
You don't need a big room to enjoy the benefits of 7.1. More importantly is that the speaker systems tweeter/midrange units are matching. To a lesser degree but still important is the processors ability to setup and room correction.
I moved my 7.1 home theater from a smaller well dampened room to a larger less dampened room. While there were sonic differences attributed to the room size and damping the native or matrixed 7.1 remaines a more smoothly surround than 5.1.
You don't need a big room to enjoy the benefits of 7.1. More importantly is that the speaker systems tweeter/midrange units are matching. To a lesser degree but still important is the processors ability to setup and room correction.
I moved my 7.1 home theater from a smaller well dampened room to a larger less dampened room. While there were sonic differences attributed to the room size and damping the native or matrixed 7.1 remaines a more smoothly surround than 5.1.