If the C1 room is a square room, it will have stronger standing wave reinforcement at certain bass frequencies which may explain the impressive bass you had heard. Also its first reflection point from the sidewall will be much further away giving a weaker reflection and a longer time delay which can contribute to a better soundstage.
Without actually being there it is impossible to know for sure but the bottom line is this: Unless you are doing near field listening, it is very difficult if not impossible to draw any meaningful conclusion from comparing two different speakers in two different rooms.