pommie steve:
bass can often be the biggest problem to solve,moving the speakers around in the room can have a big affect on the bass output,the extra thick carpet may be partly responsible but i suggest experimenting with speaker positioning first,have you placed the speakers in a different position?,even small changes can make a big difference to the bass and the overall tonal aspect and the way it reacts with the room,if you have the speakers slightly closer to a rear or side wall this can thicken the bass and by altering the toe in of the speakers you can affect the tonal balance,it would be worth experimenting with these before buying new speakers.
Unfortunately I am not able to move the speakers positions about much as I live in a flat and it is not that big, the speakers are already very close to th wall but there a bay window behind my speakers- do you think that has a lot to do with the issue perhaps? Also the speakers would look so much better if they could be spiked through the carpet and balanced on the concrete floor. What a dilemma....