I have a Yamaha DSP-A1 with B&W CC6 centre speaker. After one year of perfect operations, the speaker started to short the amp during high energy sequences. At first I thought it was the amp. The dealership confirmed it was the speaker and recommended to connect a higher rating speaker. I swaped the centre speaker with a loaner from the shop and the problm dissapered. I thought I already had a high rating speaker connected but apparently not enough. Did any one face a similar problem? Any reccomendations?