Running my new Tannoy V4 speakers in over the last few days whilst at work, I wired one speaker out of phase and placed them facing each other at a low volume (5/6 out of 80). To me, they sound worse than when they were out of the box, flat, sterile and unbalanced. They were very close to each other during this time. Could the tweeters have damaged one another firing at each other in close proximity?