I have a 5.1 system consisting of a Denon AVR-X2100W, BK XLS200 MKII sub and Q Acoustics 1010i front, rear speakers and 1000Ci centre speaker. One of the front speakers is starting to misbehave (audessey reports it is out of phase but doesn't seem to affect the sound) so I was thinking of replacing both fronts. I have a unused pair of Boston Acoustics A25 speakers which I am thinking of using as my front pair but not sure if they are better, worse or no different to the QA speakers or how they will behave with the QA's. The A25's have a larger bass unit (130mm) than the QA (100mm) but the treble unit is 25mm in both speakers. I am also wondering if I could remove the rather large QA centre speaker and have a 4.1 setup. I know what you are all thinking, these speakers are about 10 years old, but they work!