Just wondering if anyone has any experience with biwiring B&W 684 speakers and if this achieves any noticeable improvement in sound quality?. The B&W 684 manual claims that biwiring enhances low level detail but I have yet to try this out. If biwiring is to be done, is it generally advisable to use the same brand and model of speaker cable for both high frequency and low frequency speaker terminals? I have thoughts of using my existing QED Revelation speaker cable for the LF terminals and QED Silver Anniversary XT cables for the HF terminals. My local dealer here in Perth (Western Australia) doesn't have any demo QED cables to trial, so I would greatly welcome any thoughts or comments on this matter (my setup involves a Cambridge Audio 840A V2 amplifier connected with the Audiolab 8200CD using Chord Co Chameleon Plus XLR interconnects). Many thanks in advance!