Sudden Harsh sound from B&W

[mr_m687]

I recently received a new pair of 804S from B&W after my original pair was found to have cosmetic flaws. My new pair has over 100 hours on them but have suddenly become extremely harsh sounding. The pair I returned had around 150 hours on them and never had this sound to them. The new pair sounded very similar to the old until now. Has anyone experienced sudden harshness during the break-in period? Could it be the bass changing? I don't have any idea what to expect from break-in? I know I have a bright room but even at medium volume it hurts to listen?

[jim777]

Check for connection problems (polarity), speaker placement, or room changes (did you remove a rug, open your curtains or something...). And if you have some A/V unit or whatever, check if you (or someone..) changed some settings in it.

[bigburner]

What happens when you try a different source?