I have a pair of nice expensive tannoy monitors that sound muddy and muffled. The tweeters work but they dont sound crisp or clear. I use a pair of sony 7506's and there is a world of difference in quality and clarity between these phones and my speakers. I have a cheap fostex board (454) and am running thru a carver pm-300 amp from the monitor outs of the board. The speaker cables are good quality and the cables are the banana type. I have already checked that the polarity matches. The speakers can be bi-amped but I don't think they have to be. There is a conductor that comes wth the speakers to connect the two sets of terminals on the back. Any ideas are greatly appreciated.