Even with the Aria I have to reduce the bass around 45 Hz. Room modes are always a problem when you can't place your speakers as you'd wish.
Thats the issue most people don't realise.
Your room is an extension of your speakers (your room IS a speaker in effect) and people buy speakers without doing enough research on how it will interact in your room.
I would never have bought the Spendor A7's for my room had I realised the effect room modes and nulls would have. That 40hz mode is a killer though. Extremely powerful and not easily tamed.
These little 906's look to be the ideal speaker for a modest British lounge especially if complimented by a pair of subwoofers!