I have just bought a new Audiolab 8000p and intend to Bi amp it . I will be using the 8000a to drive the tweeters and the 8000p to drive the woofers. I have a pair of B&W P4s. and use an Arcam CD73T CD player. I have heard that I need to do a circuit board modification to do this. Is this true? and what are your thoughts . I am using QED aniversy XT Bi wire speaker cable