I have an Overture with Beolab 4000 & 6000. 6000's are in the lounge (large room with vaulted ceiling) and the 4000's are in the dining room (a smaller room with beamed ceilings). With full system operating the bass & volume from the 4000's is far too much, can I control these seperately. My link to these is the 4 wire powerlink and will be difficult to change.