Macd,
The size of your room is that in feet or meters? If it is in feet I would not sugest you use Dali Helicon 400's also if you do buy the 400 buy the mkI and not the mkII. I know someone who has done a direct comparison and he prefered the mkI. This person has reviewed a lot of gear so I trust him in this.
But in a room like your if it has brick or or concrete walls I think the 400 is to big.
The size of your room is that in feet or meters? If it is in feet I would not sugest you use Dali Helicon 400's also if you do buy the 400 buy the mkI and not the mkII. I know someone who has done a direct comparison and he prefered the mkI. This person has reviewed a lot of gear so I trust him in this.
But in a room like your if it has brick or or concrete walls I think the 400 is to big.